Week 3 Review Questions Chemistry 115. Questions and Aswers.

Document Content and Description Below

Week 3 review Questions chemistry 115 1.What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium and 7.9 g chlorine? a. 5.2 g K... Cl b. 4.9 g KCl c. 9.9 g KCl d. 10.1 g KCl Check 2. An oxidation reaction can be defined as when an atom loses an oxygen. True False Check 3. Methanol burns in air according to the equation below. How many grams of methanol can be burned by 10 grams of oxygen? a. 2 g b. 7 g c. 10 g d. 20 g 4. The reaction below is an example of a ___ reaction. a. hydrogenation b. hydrolysis c. dehydration d. hydration Check 5. What will you observe if you mix a solution of KOH with a solution of MgI2 in the reaction below? a. bubbles of KI will form b. a solid of Mg(OH)2 will settle in reaction vessel c. a solid of KOH will form d. a clear solution will form Check 6. What was the earliest reported method of fighting infection in the operating room?:a. The patient was treated with Betadine before surgery. b. Carbolic acid was used on the surgeon’s tools. c. Listerine was the antiseptic of choice. d. The surgeons washed with soap and chlorine water. 7. An oxidizing agent is the reactant in an oxidation - reduction reaction that causes reduction of another reactant by providing electrons for the other reactant to accept. True False Check 8. Which set of coefficients properly balance the equation below? a. 1,1,5,6 b. 1,5,5,6 c. 1,5,5,1 d. 1,8,5,6 Check 9. Ethene, C2H4, burns in air according to the equation below. What is the theoretical yield (in grams) of CO2 when 3.24 g of C2H4 are reacted with 4.83 g of O2? b. 9.72 g c. 0.151 g d. 4.43 g Check 10. Choose the comment that is appropriate for the reaction: a. Carbonic anhydrase catalyzes the conversion of carbon dioxide into carbonic acid. b. The reaction runs in forward direction only. c. This reaction runs in backward direction only. d. This is a reaction that only occurs in the laboratory. Check 11. Which set of coefficients properly balance the equation below, going from reactants to products? a. 1,2,1,4 b. 2,1,1,2 c. 2,2,3,1 d. 1,2,2,1Check 12. Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement. a. single replacement b. double replacement c. decomposition d. synthesis Check 13. How many grams of oxygen (O2) are needed to completely react with 24.0 g of propane (C3H8) according to the equation below? a. 0.545 g b. 2.73 g c. 87.2 g d. 28.8 g Check 14. The function of an enzyme in a reaction is to Select one: a. cause a reaction to be reversible at the same reaction rate. b. increase the ∆G to increase the rate of reaction. c. increase the rate of reaction by reducing the activation energy. d. inhibit the reaction. 15. In the reaction energy diagram below, the activation energy is represented by a. c b. a c. d d. c 16. which set of coefficients properly balance the equation below, going from reactants to products? a. 1,3,2,3 b. 1,7,4,3 c. 2,7,4,6 d. 2,3,2,317. Balance the equation below and determine the number of moles of oxygen required to completely burn 5.00 moles of propane. a. 5.00 b. 10.0 c. 15.0 d. 25.0 Check 18. Benzoyl peroxide can be used as a treatment for acne. Benzoyl peroxide a. has a reduction action that tends to neutralize the effects of the acne bacteria. b. is injected so that it will have a general immune action against bacteria causing acne. c. is an oxidizing agent used on the skin to kill the bacteria causing acne. d. is not used for acne; it is an antiseptic used to sterilize a surgeon’s hands. 19. In the following reaction, how many grams of water are needed to completely hydrolyze 30.8 g of the ester? a. 7.48 g b. 0.416 g c. 30.8 g d. 11.3 g Check 20. 2-methylcyclopentene reacts with hydrogen in the presence of platinum catalyst to form methylcyclopentane a. 2-methylcyclopentene is reduced b. Pt is oxidized c. methylcyclopentane is reduced d. cyclohexane is oxidized Check 21 Ethyl alcohol (CH3CH2OH) is completely soluble in water. It is made of both polar and non-polar groups. Ethyl alcohol is best classified as a(n) ___ substance. a. hydrophilic b. hydrophobic c. lipophilicd. amphipathic 22. Oxygen is dissolved into water to make a solution. If the temperature of the solution is increased, the solubility of the oxygen will ___. a. decrease b. increase c. be uncha 23. A gas cylinder at a pressure of 4408 torr contains a mixture of N2, O2, and helium gases. If the partial pressure of N2 gas is 1520 torr and the partial pressure of helium is 25 torr, what is the partial pressure of O2? a. 760 torr b. 4020 torr c. 5953 torr d. 2863 torr 24. Identify the compound that is insoluble in water. a. Ba3(PO4)2 b. Ba(NO3)2 c. K3PO4 d. AgNO3 25. When a person exhales air a. lung volume decreases and lung pressure increases b. lung volume decreases and lung pressure decreases c. lung volume increases and lung pressure decreases d. lung volume increases and lung pressure increases 26. The gas constant is used in some calculations. The value of the gas constant is a. to make certain that all gases are ideal gases. b. 0.0821 L atm/mol K. c. 25°C and 1 atm. d. 0°C and 1 atm at 1-L volume. 27. When the pressure is increased above 760 torr, the boiling point of water Select one: a. decreases to temperatures below 100 C. b. remains the same at 100C.c. increases to temperatures above. d. drops to temperatures below 0c. 28. The atmospheric pressure on a given day is 742 torr. What is this pressure in atmospheres? a. 0.976 atm b. 5.63 x 105 atm c. 50.5 atm d. 1.09 x 104 atm 29. Barometers measure atmospheric pressure and temperature. True False 30. When a person inhales air, a. lung volume decreases and lung pressure increases. b. lung volume increases and lung pressure decreases. c. lung volume decreases and lung pressure decreases. d. lung volume increases and lung pressure increases 31. How many milliliters of 6.0 M HCl must be diluted to make 500.0 mL of a 0.10 M solution? a. 1.2 mL b. 8.3 mL c. 30. mL d. 300 mL 32 How many grams of AgNO3 are required to make 500.0 mL of a 0.10 M solution? Select one: a. 8.5 g b. 17 g c. 85 g d. 0.10 g 33 Blood serum has a calcium ion (Ca2+) concentration of 3.9 x 10-4 M. What is the concentration in mEq/L? Select one: a. 0.78 mEq/L b. 0.39 mEq/Lc. 2.3 mEq/L d. 6.8 mEq/L 34. A cylinder of gas originally at 28.0°C and 1.00 atm of pressure is heated to 112.0°C. What is the new pressure? Select one: a. 4.00 atm b. 0.250 atm c. 0.782 atm d. 1.28 atm Check 35. In a mountain location where the atmospheric pressure is less than 1.00 atm, water will boil at ___. Select one: a. a temperature less than 100ºC b. 100ºC c. a temperature greater than 100ºC d. None of these choices. 36. The atmospheric pressure is greater at the top of the mountain than in the valley below. Select one: True False 37. The concentration of calcium ion in blood is found to be 1.21 mmol/L. What is this concentration in mEq/L? Select one: a. 0.605 mEq/L b. 1.21 mEq/L c. 2.42 mEq/L d. 4.84 mEq/L Check 38 If 25.0 mL of 3.0 M HCl are diluted to give a final volume of 150 mL, what is the new concentration? a. 0.50 M b. 75 M c. 2.0 Md. 4.5 M 39. What will be the mass of hydrogen gas, H2, that is stored in a 15.0-L container at the pressure of 7.50 atm? The container is kept at 20.0°C. (Use the mass of 2.00 g/mol for the hydrogen.) Select one: a. 225 g b. 137 g c. 80.0 g d. 9.35 g 40. A bottle of 6.000 M NaOH is on the lab bench. You are instructed to use 75.00 mL of 0.5000 M NaOH. How much 6.000 M NaOH do you have to dilute to 75.00 mL to meet the requirement? Select one: a. The solution cannot be produced from 6.000 M NaOH. b. 37.50 mL c. 9.000 mL d. 6.250 mL . [Show More]

Last updated: 2 years ago

Preview 1 out of 9 pages