CHEMISTRY 115 Chem 115 Midterm Answers. 150 Questions and Answers.

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State Finished Completed on Friday, July 26, 2019, 1:56 PM Time taken 4 hours 23 mins Marks 136/150 Grade 145 out of 160 (91%) Question 1 Correct Mark 1 out of 1 Flag question Q... uestion text The number 390000, expressed correctly in scientific notation, is ___. Select one: a. 3.9 x 10-6 b. 3.9 x 105  c. 3.9 d. 3.9 x 10-5 Feedback : 3.9 x 105 Question 2 Correct Mark 1 out of 1 Flag question Question text The conversion of a solid directly into a gas is called ___. Select one: a. vaporization b. deposition c. sublimation  d. melting Feedback : sublimation Question 3 Correct Mark 1 out of 1 Flag question Question text When aspirin is heated, it melts at 275 F. Convert this temperature into kelvins. Select one: a. 135 K b. 408 K  c. -138 K d. 375 K Feedback : 408 K Question 4 Correct Mark 1 out of 1 Flag question Question text A weather forecaster predicts that the temperature for the day will reach 88 F. What is the Celsius value for the predicted temperature? Select one: a. 88C b. 273C c. 31C  d. 304C Feedback : 31C Question 5 Correct Mark 1 out of 1 Flag question Question text The energy available by virtue of a rock sitting at the top of a cliff is Select one: a. chemical energy. b. potential energy.  c. thermal energy. d. kinetic energy. Feedback : potential energy. Question 6 Correct Mark 1 out of 1 Flag question Question text A 33.0 g of aluminum is heated on a stove. The temperature of the aluminum increases from 25 C to 120 C. How much heat energy was absorbed? (The specific heat of aluminum is 0.0215 cal/gC.) Select one: a. 67 cal  b. 0.0075 cal c. 0.61 cal d. 13 cal Feedback : 67 cal Question 7 Incorrect Mark 0 out of 1 Flag question Question text A container holding a mixture of ice and water is placed in a 115 C oven. The ice-water mixture rises in temperature until all the ice has melted away. Select one: True False  Feedback 'True'. Question 8 Correct Mark 1 out of 1 Flag question Question text The density of ethanol at 20 C is 0.791 g/mL. How many milliliters of ethanol correspond to 12.0 g of ethanol at 20 C? Select one: a. 9.49 mL b. 15.2 mL  c. 0.791 ml d. 30.6 mL Feedback : 15.2 mL Question 9 Correct Mark 1 out of 1 Flag question Question text A patient having a serious reaction caused by a peanut allergy has a doctor’s order to have 0.240 g of epinephrine. The liquid on hand contains 250 mg/5mL bottle. How many milliliters of the liquid are required? Select one: a. 4.8 mL  b. 0.0048 mL c. 12 mL d. 1.2 mL Feedback : 4.8 mL Question 10 Correct Mark 1 out of 1 Flag question Question text Each of the numbers below is a measured quantity. Solve the calculation and give the correct number of significant figures.
 (17.8 x 0.1150) / 6.7 Select one: a. 0.31  b. 0.3 c. 0.306 d. 0.3055 Feedback : 0.31 Question 11 Correct Mark 1 out of 1 Flag question Question text Which of the following explanations is a testable hypothesis? Select one: a. A sugar crystal is forming faster because it is grown in cold environment.  b. A plant is dying because of the direction of spinning of the earth. c. A bird lays more eggs because of the intensity of thunderstorms. d. A burp increases the weight of a baby. Feedback : A sugar crystal is forming faster because it is grown in cold environment. Question 12 Correct Mark 1 out of 1 Flag question Question text The higher the temperature of something, the greater the kinetic energy of the particles from which it is made. Select one: True  False Feedback 'True'. Question 13 Correct Mark 1 out of 1 Flag question Question text Accuracy tells us how close a measurement is to the true value. Select one: True  False Feedback 'True'. Question 14 Correct Mark 1 out of 1 Flag question Question text The number 84.3759 rounded to the nearest 1 significant figure is ___. Select one: a. 90 b. 8 c. 80  d. 84 Feedback : 80 Question 15 Correct Mark 1 out of 1 Flag question Question text Which of the following is a chemical change? Select one: a. evaporation of water b. melting of copper c. tearing paper d. frying an egg  Feedback : frying an egg Question 16 Correct Mark 1 out of 1 Flag question Question text 2.32 g is the same as ___. Select one: a. 232 kg b. 23.2 cg c. 2320 mg  d. 0.0232 dg Feedback : 2320 mg Question 17 Correct Mark 1 out of 1 Flag question Question text Round the following to three significant figures: 399870 Select one: a. 4.00×105  b. 3.99×106 c. 4.00×106 d. 3.99×105 Feedback Your answer is correct. : 4.00×105 Question 18 Correct Mark 1 out of 1 Flag question Question text Gamma rays require a thick slab of concrete or lead to block them because they Select one: a. have the lowest energy. b. are so energetic that they have a very high penetrating power.  c. are large in size. d. are small in size. Feedback : are so energetic that they have a very high penetrating power. Question 19 Correct Mark 1 out of 1 Flag question Question text 650. J is the same amount of energy as ________. Select one: a. 2.72 cal b. 1550 cal c. 155 cal  d. 2720 cal e. 650. cal Feedback Your answer is correct. : 155 cal Question 20 Correct Mark 1 out of 1 Flag question Question text What is the relationship of a metal atom to the right of another metal atom in the same period? Select one: a. The atom to the right is usually the smaller in diameter.  b. The atom to the right is usually the smaller in atomic weight. c. The atom to the right is usually the smaller in atomic number. d. The atom to the right is more likely to have fewer isotopes. Feedback : The atom to the right is usually the smaller in diameter. Question 21 Correct Mark 1 out of 1 Flag question Question text The isotope of hydrogen that is a radioisotope has a mass number of 3. Select one: True  False Feedback 'True'. Question 22 Correct Mark 1 out of 1 Flag question Question text The mass in grams of one mole of an element is the element’s ___. Select one: a. atomic number b. atomic weight  c. molar mass d. isotope number Feedback : atomic weight Question 23 Correct Mark 1 out of 1 Flag question Question text The atom’s structure characteristically has Select one: a. the protons and neutron within the nucleus. b. the electrons located outside the nucleus. c. mostly empty space. d. All of these choices are correct.  Feedback : All of these choices are correct. Question 24 Correct Mark 1 out of 1 Flag question Question text An alpha particle is identical to which of the following? Select one: a. the nucleus of a hydrogen atom b. an electron c. a beta radiation d. the nucleus of a helium-4-atom  Feedback : the nucleus of a helium-4-atom Question 25 Correct Mark 1 out of 1 Flag question Question text Which group contains the alkali metals? Select one: a. 1A  b. 2A c. 3A d. 8A Feedback : 1A Question 26 Correct Mark 1 out of 1 Flag question Question text Most elements have radioisotopes. What is a radioisotope? Select one: a. An isotope that has a different atomic number. b. An isotope that releases nuclear radiation.  c. An isotope that releases electrical radiation. d. Any isotope that can absorb nuclear particles. Feedback : An isotope that releases nuclear radiation. Question 27 Correct Mark 1 out of 1 Flag question Question text Iron-59 has a half-life of 45 days. How much of a 50.0-gram sample would remain after 180 days? Select one: a. 1.00 g b. 3.13 g  c. 25.0 g d. There is no way to determine the results. Feedback : 3.13 g Question 28 Correct Mark 1 out of 1 Flag question Question text The periodic table of the elements does not list whole numbers for atomic weights. Why? Select one: a. The atomic weights are not predictable. b. The atomic weights include protons and neutrons at 1 amu each, but they also include electrons, which weigh a lot less than one. c. The atomic weight is the weighted average of the masses of the known isotopes of an element.  d. The atomic weights do not include isotopes. Feedback : The atomic weight is the weighted average of the masses of the known isotopes of an element. Question 29 Correct Mark 1 out of 1 Flag question Question text An isotope of sodium contains 11 protons and 12 neutrons. Select one: a. The atom also contains 11 electrons.  b. The atom also contains 12 electrons. c. The atom also contains 23 electrons. d. There are no other factors related to the 11 protons and 12 neutrons. Feedback : The atom also contains 11 electrons. Question 30 Correct Mark 1 out of 1 Flag question Question text The emission of an alpha particle only decreases the atomic mass of the atom. Select one: True False  Feedback 'False'. Question 31 Correct Mark 1 out of 1 Flag question Question text Atomic number and mass number differ in that atomic number is the number of ___ and mass number is ___ in an atom’s nucleus. Select one: a. protons/the number of neutrons b. neutrons/the number of protons c. protons/the number of electrons d. protons/the sum of protons and neutrons  Feedback : protons/the sum of protons and neutrons Question 32 Correct Mark 1 out of 1 Flag question Question text Trace elements and vitamins are required for the body to function properly Select one: True  False Feedback 'True'. Question 33 Correct Mark 1 out of 1 Flag question Question text The atomic number is Select one: a. the number of neutrons in an atom. b. the number of protons in an atom.  c. the number of protons and neutrons in an atom. d. the number of subatomic particles in an atom. Feedback : the number of protons in an atom. Question 34 Correct Mark 1 out of 1 Flag question Question text Which of the following statements is true about a beta particle?
 Select one: a. it has the same mass as a helium nucleus b. when ejected from the nucleus formed has same mass as the original isotope c. when ejected from the nucleus of a radioisotope, the nucleus formed has one more proton  d. it is the same as a gamma radiation Feedback : when ejected from the nucleus of a radioisotope, the nucleus formed has one more proton Question 35 Correct Mark 1 out of 1 Flag question Question text How many carbon(C) atoms are present in 30 moles of carbon? Select one: a. 1.20 x 101C atoms b. 1.80 x 1023 C atoms  c. 3.60 x 102 C atoms d. 6.02 x 1023 C atoms Feedback : 1.80 x 1023 C atoms Question 36 Correct Mark 1 out of 1 Flag question Question text A sample of magnesium weighs 10 grams. How many moles of magnesium are there in the sample? Select one: a. 10 moles b. 6 x 1023 moles c. 60 x 1023 atoms d. 0.4 moles  Feedback : 0.4 moles Question 37 Correct Mark 1 out of 1 Flag question Question text What is the formula of the ionic compound that forms between calcium ions and phosphate ions? Select one: a. CaPO4 b. Ca2PO4 c. Ca2(PO4)3 d. Ca3(PO4)2  Feedback : Ca3(PO4)2 Question 38 Correct Mark 1 out of 1 Flag question Question text Which of the following atom pairs would most likely be connected by a covalent bond? Select one: a. Na and O b. O and Cl  c. Na and Cl d. K and F Feedback : O and Cl Question 39 Correct Mark 1 out of 1 Flag question Question text Which of the following atom pairs would most likely be connected by an ionic bond? Select one: a. K and Br  b. O and Br c. S and Br d. F and Br Feedback : K and Br Question 40 Correct Mark 1 out of 1 Flag question Question text The difference between an ionic bond and a covalent bond is that Select one: a. ionic bonds commonly occur between two metals and covalent bonds occur between metals and nonmetals. b. ionic bonds are between atoms that can share electrons; covalent bonds are between atoms that will donate/accept electrons. c. covalent bonds come about because of a sharing of electrons; ionic bonds do not.  d. ionic bonds are between smaller atoms; covalent bonds are between large atoms. Feedback : covalent bonds come about because of a sharing of electrons; ionic bonds do not. Question 41 Correct Mark 1 out of 1 Flag question Question text NO3- is the ___ ion. Select one: a. nitrous b. nitrogen trioxide c. nitrite d. nitrate  Feedback : nitrate Question 42 Correct Mark 1 out of 1 Flag question Question text What is the molar mass of magnesium chloride? Select one: a. 59.80 g/mol b. 90.40 g/mol c. 95.30 g/mol  d. 125.90 g/mol Feedback : 95.30 g/mol Question 43 Correct Mark 1 out of 1 Flag question Question text Which ion has the same number of electrons as the noble gas argon? Select one: a. F- b. Mg2+ c. Br- d. Ca2+  Feedback : Ca2+ Question 44 Incorrect Mark 0 out of 1 Flag question Question text The compound BaBr2 is named Select one: a. barium dibromide. b. barium (II) bromide. c. barium bromide. d. barium bromate.  Feedback : barium bromide. Question 45 Correct Mark 1 out of 1 Flag question Question text The formula of calcium sulfate is ___. Select one: a. CaSO3 b. CaSO4  c. CaS d. CaS2 Feedback : CaSO4 Question 46 Correct Mark 1 out of 1 Flag question Question text How many molecules of aspirin (C9H8O4) are present in 41.40 g of aspirin? Select one: a. 0.2300 aspirin molecules b. 2.700 x 1026 aspirin molecules c. 9.600 x 1023 aspirin molecules d. 1.383 x 1023 aspirin molecules  Feedback : 1.383 x 1023 aspirin molecules Question 47 Incorrect Mark 0 out of 1 Flag question Question text Choose the electron dot structure for a magnesium atom. Select one: a.  b. c. d. Feedback : Question 48 Correct Mark 1 out of 1 Flag question Question text What is the molar mass of ammonium oxide? Select one: a. 30.00 g/mol b. 34.00 g/mol c. 44.00 g/mol d. 52.00 g/mol  Feedback : 52.00 g/mol Question 49 Correct Mark 1 out of 1 Flag question Question text What is the molar mass of isopentyl acetate, C7H14O2, a compound responsible for the odor of bananas? Select one: a. 130.19 g/mole  b. 98.32 g/mole c. 146.58 g/mole d. 119.35 g/mole e. 13.19 g/mole Feedback : 130.19 g/mole Question 50 Correct Mark 1 out of 1 Flag question Question text The formula weight of magnesium fluoride is 62.30 amu. Select one: True  False Feedback 'True'. Question 51 Correct Mark 1 out of 1 Flag question Question text Potassium and magnesium cannot form a binary compound together. Select one: True  False Feedback 'True'. Question 52 Correct Mark 1 out of 1 Flag question Question text What is the mass of 0.00142 mole of vitamin C (C6H8O6)? Select one: a. 0.250 g  b. 0.500 g c. 0.125 g d. 2.50 g Feedback : 0.250 g Question 53 Correct Mark 1 out of 1 Flag question Question text According to the octet rule, how many valence electrons are present in a chloride ion (Cl-)? Select one: a. 1 b. 2 c. 8  d. 4 Feedback : 8 Question 54 Correct Mark 1 out of 1 Flag question Question text The name for the Cu2+ ion is Select one: a. copper ion. b. cobalt (II) ion. c. copper (I) ion. d. copper(II) ion.  Feedback : copper(II) ion. Question 55 Correct Mark 1 out of 1 Flag question Question text HPO42- is the ___ ion. Select one: a. hydrogen phosphate  b. monophosphate c. phosphide d. phosphite Feedback : hydrogen phosphate Question 56 Correct Mark 1 out of 1 Flag question Question text CH2Cl2 is polar. Select one: True  False Feedback 'True'. Question 57 Correct Mark 1 out of 1 Flag question Question text Ketone is present in Vanillin. Select one: True False  Feedback 'False'. Question 58 Incorrect Mark 0 out of 1 Flag question Question text The following molecule belongs to which organic family? Select one: a. ketone b. ether  c. carboxylic acid d. ester Feedback : ester Question 59 Correct Mark 1 out of 1 Flag question Question text Organic compounds are always highly water soluble. Select one: True False  Feedback 'False'. Question 60 Correct Mark 1 out of 1 Flag question Question text Carbon has six valence electrons. Select one: True False  Feedback 'False'. Question 61 Correct Mark 1 out of 1 Flag question Question text Shampoos, perfumes, and plastics are organic compounds. Select one: True  False Feedback 'True'. Question 62 Correct Mark 1 out of 1 Flag question Question text The CaF bond in CaF2 is nonpolar. Select one: True False  Feedback 'False'. Question 63 Correct Mark 1 out of 1 Flag question Question text Most organic compounds are flammable. Select one: True  False Feedback 'True'. Question 64 Correct Mark 1 out of 1 Flag question Question text The molecule shown below contains an aldehyde functional group. Select one: True False  Feedback 'False'. Question 65 Correct Mark 1 out of 1 Flag question Question text Oxygen is more electronegative than carbon, so when an oxygen atom pulls the shared pair of bonding electrons toward itself to form a covalent bond, the oxygen atom carries Select one: a. a partial positive charge. b. no charge. c. a partial negative charge.  d. both a partial positive charge and a negative charge. Feedback : a partial negative charge. Question 66 Correct Mark 1 out of 1 Flag question Question text Which of the following is not typical of most hydrocarbons? Select one: a. poor solubility in water b. high flammability c. covalent bonding d. high melting point  e. low boiling point Feedback : high melting point Question 67 Correct Mark 1 out of 1 Flag question Question text The strongest noncovalent interaction that can occur between two methyl alcohol molecules is ___. Select one: a. dipole-dipole forces b. hydrogen bonding  c. ion-dipole interaction d. London force Feedback : hydrogen bonding Question 68 Correct Mark 1 out of 1 Flag question Question text The shape of H2O is bent. Select one: True  False Feedback 'True'. Question 69 Correct Mark 1 out of 1 Flag question Question text Which molecule is nonpolar even though it contains polar bonds? Select one: a. NH3 b. H2O c. CCF4  d. CHClF2 Feedback : CCF4 Question 70 Partially correct Mark 0 out of 1 Flag question Question text Matching: Choose the type of organic family that matches each compound. Answer 1Choose...disulfideCarboxylic acidthiolketoneaminealkene  Answer 2Choose...disulfideCarboxylic acidthiolketoneaminealkene  Answer 3Choose...disulfideCarboxylic acidthiolketoneaminealkene  Answer 4Choose...disulfideCarboxylic acidthiolketoneaminealkene  Answer 5Choose...disulfideCarboxylic acidthiolketoneaminealkene  Answer 6Choose...disulfideCarboxylic acidthiolketoneaminealkene  Feedback : → alkene, → Carboxylic acid, → thiol, → disulfide, → ketone, → amine Question 71 Correct Mark 1 out of 1 Flag question Question text A hydrocarbon contains only the elements ________. Select one: a. carbon and oxygen b. carbon and hydrogen  c. hydrogen and oxygen d. carbon, hydrogen, and nitrogen e. carbon, hydrogen, and oxygen Feedback : carbon and hydrogen Question 72 Correct Mark 1 out of 1 Flag question Question text Organic chemistry is the study of the chemistry of compounds of ________. Select one: a. oxygen b. hydrogen c. polymers d. carbon  e. living things Feedback : carbon Question 73 Correct Mark 1 out of 1 Flag question Question text There are vast numbers of organic compounds. Select one: True  False Feedback 'True'. Question 74 Correct Mark 1 out of 1 Flag question Question text The shape of formaldehyde CH2O (C is the central atom), a substance often used in building insulation materials, is ___. Select one: a. trigonal planar  b. tetrahedral c. linear d. pyramidal Feedback : trigonal planar Question 75 Correct Mark 1 out of 1 Flag question Question text In chemical reaction Select one: a. the covalent bonds and ionic bonds that hold elements and compounds together remain intact as new bonds are formed b. the covalent and ionic bonds that hold elements and compounds together are broken and no new bonds are formed c. the covalent and ionic bonds that hold elements and compounds together are broken and new bonds are formed  d. neither new bonds are formed nor old bonds broken Feedback : the covalent and ionic bonds that hold elements and compounds together are broken and new bonds are formed Question 76 Correct Mark 1 out of 1 Flag question Question text The reaction below is an example of a ___ reaction. Select one: a. dehydration  b. hydrogenation c. hydrolysis d. combustion Feedback : dehydration Question 77 Correct Mark 1 out of 1 Flag question Question text Sodium stearate is a soap that is produced from stearic acid, one of the fatty acids, by the reaction: The reaction that was set up with 0.25 g stearic acid and an excess of sodium hydroxide produced 0.25 grams soap. The percent yield was Select one: a. 100%. b. 93%.  c. 25%. d. 1%. Feedback : 93%. Question 78 Correct Mark 1 out of 1 Flag question Question text The percent yield of a reaction is determined by dividing ___ in grams or moles by the ___ in grams or moles times 100% Select one: a. theoretical yield, actual yield b. actual yield, theoretical yield  c. amount of reactant, amount of products d. amount of products, amount of reactants Feedback : actual yield, theoretical yield Question 79 Correct Mark 1 out of 1 Flag question Question text In a hydrolysis reaction, water is used to split a molecule Select one: True  False Feedback 'True'. Question 80 Correct Mark 1 out of 1 Flag question Question text In a synthesis reaction, one compound breaks down to form elements or simpler compounds Select one: True False  Feedback 'False'. Question 81 Incorrect Mark 0 out of 1 Flag question Question text The coefficients used to balance chemical equations can be interpreted in terms of atoms, moles, or grams. Select one: True  False Feedback 'False'. Question 82 Correct Mark 1 out of 1 Flag question Question text A chemical reaction in which there is a transfer of electrons from one reactant to another reactant can be classified as Select one: a. decomposition reaction b. combustion reaction c. oxidation-reduction reaction  d. double replacement reaction Feedback : oxidation-reduction reaction Question 83 Correct Mark 1 out of 1 Flag question Question text If 5.5 moles of pentane are burned according to the following equation: how many moles of oxygen are required? Select one: a. 41  b. 83 c. 11 d. 5.5 Feedback : 41 Question 84 Incorrect Mark 0 out of 1 Flag question Question text Oxidation involves loss of electrons. Select one: True False  Feedback 'True'. Question 85 Correct Mark 1 out of 1 Flag question Question text The catalyst utilized by biological systems for hydrogenation reactions is ___. Select one: a. platinum b. hydrogen c. an enzyme  d. a carbon-carbon bond Feedback : an enzyme Question 86 Correct Mark 1 out of 1 Flag question Question text Which of the factors will increase the rate of a reaction? Select one: a. increasing activation energy b. increasing the temperature  c. decreasing one of the reactant concentrations d. decreasing the temperature Feedback : increasing the temperature Question 87 Correct Mark 1 out of 1 Flag question Question text The reaction below is an example of a ___ reaction. Select one: a. hydrogenation b. hydrolysis  c. dehydration d. neutralization Feedback : hydrolysis Question 88 Correct Mark 1 out of 1 Flag question Question text A test used by geologists to determine if the carbonate ion is present in rock can be performed by dripping a hydrochloric acid solution on the sample and looking for the bubbling of carbon dioxide. How many moles of carbon dioxide are produced by the reaction of 0.75 moles of limestone, CaCO3? Select one: a. 2.35 moles b. 2 moles c. 1 mole d. 0.75 moles  Feedback : 0.75 moles Question 89 Correct Mark 1 out of 1 Flag question Question text Barium and sulfur react to produce barium sulfide. What is the role of barium in this reaction? Select one: a. Barium is not affected by the processes of the chemical reaction. b. Barium is being reduced. c. Barium serves as the reducing agent.  d. Barium is the oxidizing agent. Feedback : Barium serves as the reducing agent. Question 90 Correct Mark 1 out of 1 Flag question Question text In the reaction below: Select one: a. CH3CH=CH2 is oxidized b. CH3CH=CH2 is reduced  c. CH3CH2CH3 is reduced d. CH3CH=CH2 is neither oxidized nor reduced Feedback : CH3CH=CH2 is reduced Question 91 Correct Mark 1 out of 1 Flag question Question text Ethyne, C2H2, used in welding react with oxygen as shown below. Which of the following is about this reaction? Select one: a. carbon is oxidized  b. the reaction can be classified as a hydration reaction c. C2H2 is the oxidizing agent d. CO2 is the reducing agent Feedback : carbon is oxidized Question 92 Correct Mark 1 out of 1 Flag question Question text According to the following equation, what mass of silver nitrate would be required to react with 0.500 grams potassium chloride? Select one: a. 0.500 g b. 1.14 g  c. 85.0 g d. 170 g Feedback : 1.14 g Question 93 Correct Mark 1 out of 1 Flag question Question text Isooctane, C8H18, a component of gasoline is a liquid at room temperature. How many moles of oxygen are required to completely react with 4 moles of isooctane? Select one: a. 50  b. 12 c. 100 d. 25 Feedback : 50 Question 94 Incorrect Mark 0 out of 1 Flag question Question text According to Boyle’s law, when the pressure on a gas is doubled (at constant temperature), its volume will ___. Select one: a. double  b. be reduced to 1/2 c. quadruple d. remain the same Feedback : be reduced to 1/2 Question 95 Correct Mark 1 out of 1 Flag question Question text When a cucumber is placed into a concentrated salt solution (brine) during the pickling process, the cucumber will shrivel because water will move from the ___ to the ___ and this process is known as ___. Select one: a. cucumber/salt solution/diffusion b. salt solution/cucumber/osmosis c. cucumber/salt solution/osmosis  d. salt solution/cucumber/diffusion Feedback : cucumber/salt solution/osmosis Question 96 Correct Mark 1 out of 1 Flag question Question text Milk of Magnesia is a heterogeneous mixture of magnesium hydroxide, Mg(OH)2, and water. The label on the bottle says that one should “Shake Well Before Using.” Milk of Magnesia would be classified as a ___. Select one: a. solution b. suspension  c. colloid d. solvent Feedback : suspension Question 97 Correct Mark 1 out of 1 Flag question Question text The particles of a colloid are larger than the particles of a solution. Select one: True  False Feedback 'True'. Question 98 Correct Mark 1 out of 1 Flag question Question text The device used to determine a patient’s blood pressure is the Select one: a. manometer. b. barometer. c. sphygmomanometer.  d. hyperbarometer. Feedback : sphygmomanometer. Question 99 Correct Mark 1 out of 1 Flag question Question text Which of the following ionic substances is soluble in water? Select one: a. Ca(OH)2 b. PbCO3 c. AgCl d. KNO3  Feedback : KNO3 Question 100 Correct Mark 1 out of 1 Flag question Question text Henry’s law predicts that the higher the pressure the smaller the solubility of a gas in a liquid. Select one: True False  Feedback 'False'. Question 101 Correct Mark 1 out of 1 Flag question Question text Soaps are amphipathic compounds. Which statement best describes them? Select one: a. Soaps cannot be attracted to either polar or nonpolar compounds. b. Soaps dissolve best in polar solvents, which is why they can remove dirt. c. Soaps have a hydrophobic end, which will attract nonpolar substances, such as soil on clothing.  d. The soaps that are the most effective in cleaning contain the calcium ion. Feedback : Soaps have a hydrophobic end, which will attract nonpolar substances, such as soil on clothing. Question 102 Correct Mark 1 out of 1 Flag question Question text Unlike acetic acid (CH2COOH), which is completely soluble in water, 1-hexanoic acid (CH2CH2CH2CH2CH2COOH) is only slightly soluble in water because Select one: a. only acetic acid forms hydrogen bonds. b. acetic acid has a higher boiling point than 1-hexanoic acid. c. the increased length of carbon chain in 1-hexanoic acid increases its hydrophobic character.  d. acetic acid does not ionize in water. Feedback : the increased length of carbon chain in 1-hexanoic acid increases its hydrophobic character. Question 103 Correct Mark 1 out of 1 Flag question Question text A hurricane might be preceded by an atmospheric pressure of 727 torr. Express 727 torr in atmospheres of pressure. Select one: a. 0.727 atm b. 0.957 atm  c. 1.05 atm d. 49.5 atm Feedback : 0.957 atm Question 104 Correct Mark 1 out of 1 Flag question Question text An uninflated balloon full of air has a volume of 300.0 mL and contains 0.0240 mole of air. A 2.00 g piece of dry ice (solid CO2) is placed in the vessel and sealed. What is the volume of the balloon after the dry ice has vaporized? Assume constant temperature and pressure. Also, assume no change in the initial amount of air. Select one: a. 869 mL  b. 300 mL c. 240 mL d. 455 mL Feedback : 869 mL Question 105 Correct Mark 1 out of 1 Flag question Question text Avogadro’s law describes the relationship of ___. Select one: a. volume and moles gas  b. temperature and moles gas c. temperature, pressure, and moles gas d. pressure and moles gas Feedback : volume and moles gas Question 106 Correct Mark 1 out of 1 Flag question Question text Arrange the terms solution, suspension, and colloid in order of increasing size of the dispersed particles. Select one: a. solution < suspension < colloid b. solution < colloid < suspension  c. suspension < solution < colloid d. colloid < solution < suspension 35.When red blood cells are placed into a NaCl solution more dilute than 0.9%(w/v), which is the same solute concentration as found inside the cells, they will undergo ___ since dilute solution is ___. a) crenation/hypotonic b) crenation/hypertonic *c) hemolysis/hypotonic d) hemolysis/hypertonic Feedback : solution < colloid < suspension Question 107 Incorrect Mark 0 out of 1 Flag question Question text A 0.45 mole of krypton gas occupies a volume of 1.6 L. What volume will 1.8 moles of krypton occupy assuming the temperature and pressure remain the same? Select one: a. 6.4 L b. 0.51 L  c. 0.40 L d. 3.2 L Feedback : 6.4 L Question 108 Correct Mark 1 out of 1 Flag question Question text A pressurized tank contains nitrogen at 1.3 atm, oxygen at 0.7 atm, and helium at 0.1 atm. The reading of the pressure gauge is expected to be ___. Select one: a. 0.5 atm b. 0.91 atm c. 1.3 atm d. 2.1 atm  Feedback : 2.1 atm Question 109 Correct Mark 1 out of 1 Flag question Question text What is the concentration in parts per billion of an 8 L solution containing 0.017 g of potassium iodide? Select one: a. 2.1 x 102 ppb  b. 3.1 x 102 ppb c. 1.1 x 102 ppb d. 5.8 x 102 ppb Feedback : 2.1 x 102 ppb Question 110 Correct Mark 1 out of 1 Flag question Question text Which of the following ionic substances is insoluble in water? Select one: a. KNO3 b. BaSO4  c. Na3PO4 d. NH4Br Feedback : BaSO4 Question 111 Correct Mark 1 out of 1 Flag question Question text The total pressure of a mixture of gases is the sum of the partial pressures of its components. Select one: True  False Feedback 'True'. Question 112 Correct Mark 1 out of 1 Flag question Question text What is the %(w/v) of a 1500mL solution containing 45 g of NaCl? Select one: a. 5.0% b. 3.0%  c. 2.0% d. 0.030% Feedback : 3.0% Question 113 Correct Mark 1 out of 1 Flag question Question text Which of the following is the conjugate acid of NH3? Select one: a. NH2- b. NH4+  c. HNO3 d. H3O+ Feedback : NH4+ Question 114 Correct Mark 1 out of 1 Flag question Question text Choose the equilibrium constant that indicates the greatest relative amount of reactant concentration at equilibrium. Select one: a. 1.1 x 10–7  b. 2.3 x 107 c. 6.7 x 102 d. 8.3 x 10–2 Feedback : 1.1 x 10–7 Question 115 Correct Mark 1 out of 1 Flag question Question text 15.00 mL of 0.100 M NaOH is required to completely neutralize 25.00 mL of an HCl solution. What is the concentration of the HCl solution? Select one: a. 0.0600 M  b. 0.100 M c. 0.167 M d. 1.50 M Feedback : 0.0600 M Question 116 Incorrect Mark 0 out of 1 Flag question Question text The equation: has the following equilibrium constant expression. Select one: a. b. c.  d. Feedback : Question 117 Correct Mark 1 out of 1 Flag question Question text What is the concentration of [H3O+] in an aqueous solution when the [OH-] is 5.2 x 10-9 M? Select one: a. 1.9 x 10-6 M  b. 5.7 M c. 1.0 x 10-14 M d. 9.8 x 10-9 M Feedback : 1.9 x 10-6 M Question 118 Correct Mark 1 out of 1 Flag question Question text A conjugate acid-base pair Select one: a. is related by the loss and gain of H+ between 2 corresponding compounds on opposite sides of the reaction arrow.  b. has the base donating an H+ to form its conjugate base. c. has the acid donating an H+ to form its conjugate acid. d. is not related in any way. Feedback : is related by the loss and gain of H+ between 2 corresponding compounds on opposite sides of the reaction arrow. Question 119 Correct Mark 1 out of 1 Flag question Question text Calculate the pH of solution produced by dissolving 0.001 moles of HNO3 in a liter of water. Assume complete dissociation. Select one: a. pH = 3.0  b. pH = 0.001 c. pH = 1 x 10–3 d. pH = 1 x 103 Feedback : pH = 3.0 Question 120 Correct Mark 1 out of 1 Flag question Question text In the reaction: The conjugate acid of water is ___. Select one: a. HNO2 b. H2O c. H3O+  d. NO2- Feedback : H3O+ Question 121 Correct Mark 1 out of 1 Flag question Question text Antacids may contain which ion to reduce acidity? Select one: a. Na+ b. CO3­2–  c. Al3+ d. Cl– Feedback : CO3­2– Question 122 Correct Mark 1 out of 1 Flag question Question text Which of the conditions below would drive this reaction to the right? pyruvic acid lactic acid Select one: a. removing hydronium ion b. adding lactic acid c. adding water d. adding pyruvic acid  Feedback : adding pyruvic acid Question 123 Correct Mark 1 out of 1 Flag question Question text When a reaction is at equilibrium, Select one: a. it has no products. b. the rate of the forward reaction is equal to the rate of its reverse.  c. it occurs very quickly using up all of the reactants. d. it produces the same amount of product as reactant. Feedback : the rate of the forward reaction is equal to the rate of its reverse. Question 124 Correct Mark 1 out of 1 Flag question Question text The pH of blood is maintained at 7.35-7.45 by the following buffer system: The H2CO3 is produced by the reaction of CO2 with water according to the equation: When one exercises, there is increased cellular output of CO2. What effect will this have on the pH of the blood if the excess CO2 is not eliminated? Select one: a. The pH will increase. b. The pH will decrease.  c. The pH will remain the same. d. It is impossible to predict the effect. Feedback : The pH will decrease. Question 125 Correct Mark 1 out of 1 Flag question Question text In the reaction: NO2- is the Select one: a. conjugate base of H2O. b. conjugate base of HNO2.  c. conjugate acid of HNO2. d. conjugate base of H3O+. Feedback : conjugate base of HNO2. Question 126 Correct Mark 1 out of 1 Flag question Question text What is the [OH-] of a solution whose pH is 3.00? Select one: a. 1.0 x 10-3 M b. 1.0 x 10-14 M c. 1.0 x 10-11 M  d. 1.0 x 10-12 M Feedback : 1.0 x 10-11 M Question 127 Correct Mark 1 out of 1 Flag question Question text Acids and bases can react with and damage many compounds that are vital to living organisms. Select one: True  False Feedback 'True'. Question 128 Correct Mark 1 out of 1 Flag question Question text In the reaction below: Increasing the concentration of Cl2 will ___ at equilibrium. Select one: a. increase the concentration of PCl5  b. increase the concentration of PCl3 c. decrease the concentration of PCl5 d. have no effect Feedback : increase the concentration of PCl5 Question 129 Incorrect Mark 0 out of 1 Flag question Question text Which of the following statements is true? Select one: a. The larger the Ka for an acid, the weaker the acid. b. The smaller the pKa of an acid, the stronger the acid. c. The larger the pKa of an acid, the stronger the acid. d. The smaller the Ka, the stronger the acid.  Feedback : The smaller the pKa of an acid, the stronger the acid. Question 130 Correct Mark 1 out of 1 Flag question Question text Whenever an equilibrium constant, Keq, has a value greater than 1, which of the following statements is true at equilibrium? Select one: a. The concentration of reactants is greater than the concentration of the products. b. The concentration of products is the same as the concentration of reactants. c. The concentration of the products is greater than the concentration of the reactants.  d. Relative composition of reaction mixture cannot be predicted. Feedback : The concentration of the products is greater than the concentration of the reactants. Question 131 Correct Mark 1 out of 1 Flag question Question text What is the pH of a solution in which [H3O]+ is 2.2 x 10-12 M? Select one: a. 2.34 b. 4.54 x 10-3 c. 11.66  d. 8.42 Feedback : 11.66 Question 132 Correct Mark 1 out of 1 Flag question Question text Which raises the pH when added to water? Select one: a. ethyl alcohol b. propanoic acid c. methyl amine  d. methyl alcohol Feedback : methyl amine Question 133 Correct Mark 1 out of 1 Flag question Question text Provide the IUPAC name for the following organic compound. Select one: a. N-Methyl-2-butamine  b. methylbutanamine c. dimethypropyllamine d. butylmethanamine Feedback : N-Methyl-2-butamine Question 134 Correct Mark 1 out of 1 Flag question Question text What is the major organic product of the following reaction? Select one: a. 1-propanol b. 2-propanol  c. propanal d. propanone Feedback : 2-propanol Question 135 Correct Mark 1 out of 1 Flag question Question text What is the IUPAC name of the molecule below? Select one: a. octanoic acid b. 6-ethyl-4-methylhexanoic acid c. 4,6-dimethyloctanoic acid  d. 3,5-dimethyloctanoic acid Feedback : 4,6-dimethyloctanoic acid Question 136 Correct Mark 1 out of 1 Flag question Question text An amide can be identified by noting that Select one: a. there is a nitrogen incorporated in the structure. b. there is a nitrogen attached to an oxygen from a carbon. c. all of the carbon chains attach to a nitrogen. d. a nitrogen attaches to a carbonyl carbon.  Feedback : a nitrogen attaches to a carbonyl carbon. Question 137 Correct Mark 1 out of 1 Flag question Question text The carboxylic acids share which characteristic with the phenols? Select one: a. They have relatively high boiling points. b. They are capable of forming hydrogen bonds. c. They are weak acids. d. All of these answer choices are correct.  Feedback : All of these answer choices are correct. Question 138 Correct Mark 1 out of 1 Flag question Question text Give the correct IUPAC name for the following molecule: Select one: a. 2-Ethylpentane b. 3-Methylhexane c. 3-Methylcycloheptane d. 3-Methylheptane  Feedback : 3-Methylheptane Question 139 Correct Mark 1 out of 1 Flag question Question text Which of the following compounds has the highest boiling point and melting point? Select one: a. Hexane b. Propane c. Pentane d. Octane  Feedback : Octane Question 140 Correct Mark 1 out of 1 Flag question Question text When the ester ethyl butanoate, CH3CH2CH2COOCH2CH3, is hydrolyzed under basic conditions, which compounds are the products? Select one: a. ethyl alcohol and butanoic acid b. butanol and ethanoic (acetic) acid c. ethyl alcohol and the butanoate ion  d. butanol and the ethanoate ion Feedback : ethyl alcohol and the butanoate ion Question 141 Correct Mark 1 out of 1 Flag question Question text The correct IUPAC name for the molecule below is ___. Select one: a. 1-pentene b. 2,3-dimethyl-1-pentyne  c. 2,3,3-trimethyl-1-butyne d. 2,3-dimethyl-1-heptene Feedback : 2,3-dimethyl-1-pentyne Question 142 Correct Mark 1 out of 1 Flag question Question text The larger the carboxylic acid, the more hydrogen bonding occurs between molecules. Select one: True False  Feedback 'False'. Question 143 Incorrect Mark 0 out of 1 Flag question Question text The following is an example of what type of reaction? Select one: a. Hydration b. Combustion c. Hydrogeneation  d. Halogenation Feedback : Combustion Question 144 Correct Mark 1 out of 1 Flag question Question text The reaction of benzoic acid and sodium hydroxide Select one: a. produces sodium benzoate, a salt. b. results in a compound that is water soluble. c. goes all the way to the right. d. All of these answer choices are correct.  Feedback : All of these answer choices are correct. Question 145 Correct Mark 1 out of 1 Flag question Question text Phenol forms a basic solution in water. Select one: True False  Feedback 'False'. Question 146 Correct Mark 1 out of 1 Flag question Question text When the ester ethyl butanoate, CH3CH2CH2COOCH2CH3, is hydrolyzed under acidic conditions, which compounds are the products? Select one: a. ethyl alcohol and butanoic acid  b. butanol and ethanoic (acetic acid) c. ethyl alcohol and the butanoate ion d. butanol and the ethanoate ion Feedback : ethyl alcohol and butanoic acid Question 147 Correct Mark 1 out of 1 Flag question Question text What is the name of this compound? Select one: a. ethylmethyl-sec-butyl-ammonium b. ethylmethylbutylammonium c. N-ethyl-N-methyl-3-butamine d. N-ethyl-N-methyl-2-butanamine  Feedback : N-ethyl-N-methyl-2-butanamine Question 148 Correct Mark 1 out of 1 Flag question Question text Given the following amines: 1ºamine 2ºamine 3º amine These three amines all have the same formula weight. Rank them in order of increasing boiling point. (From lowest to highest.) Select one: a. 1º < 2º < 3º b. 2º < 1º < 3º c. 3º < 2º < 1º  d. 3º < 1º < 2º Feedback : 3º < 2º < 1º Question 149 Incorrect Mark 0 out of 1 Flag question Question text Both carboxylic acids and phenols react with strong bases to produce Select one: a. the conjugate base of the carboxylic acid or phenol. b. a stronger acid or phenol. c. a complex with water.  d. gaseous products. Feedback : the conjugate base of the carboxylic acid or phenol. Question 150 Incorrect Mark 0 out of 1 Flag question Question text Provide the organic product formed when NaOH reacts with 3-bromophenol. Select one: a. sodium 3-bromophenoxide b. sodium phenoxide c. 3-bromobenzoic acid  d. 3-bromobenzoate Feedback : sodium 3-bromophenoxide [Show More]

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