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Chemistry_Final_Exam_Review_2021_Answer_key ( all answers are 100% correct ) DOWNLOAD TO SCORE A

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Chemistry Final Exam Sample Items 1. Which idea of John Dalton is no longer considered part of the modern view of atoms? a. Atoms are extremely small. b. Atoms of the same element have identical ma... sses. c. Atoms combine in simple whole number ratios to form compounds. d. Atoms of different elements can combine in different ratios to form different compounds. 2. Which best describes the current atomic theory? a. Atoms consist of electrons circling in definite orbits around a positive nucleus. b. Atoms are composed of electrons in a cloud around a positive nucleus. c. Atoms can easily be split, at which time they become radioactive. d. An atom’s mass is determined by the mass of its neutrons. 3. What is the nuclear composition of uranium-235? a. 92 electrons and 143 protons b. 92 protons and 143 electrons c. 143 protons and 92 neutrons d. 92 protons and 143 neutrons Notice it said nuclear composition and in the nucleus are protons and neutrons Atomic number of uranium = 92 so 92 protons Neutrons = 235-92 = 143 4. Which best describes the relationship between subatomic particles in any neutral atom? a. The number of protons equals the number of electrons. b. The number of protons equals the number of neutrons. c. The number of neutrons equals the number of electrons. d. The number of neutrons is greater than the number of protons. In order to be neutral, positives and negatives must equal so protons (+) = electrons (-) 5. What is the name of the compound PbO2? a. Lead oxide b. Lead (II) oxide c. Lead oxide (II) d. Lead (IV) oxide Pb+4O-2 cross cross to give Pb2O4 which can be reduced to PbO2 6. What is the name of HCl (aq)? a. Chloric acid b. Hydrochloric acid c. Hydrogen chloride d. Perchloric acid Starts with H so is an acid, no oxygen so use prefix hydro and change ending to –ic 7. What is the chemical formula for calcium nitrate? a. CaNO3 b. Ca(NO2)2 c. Ca(NO3)2 d. Ca3N2 Ca+2NO3-1 cross cross to give choice C [Show More]

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