Chem 170 Exam 2 Review Chapters 5, 11-13 Instructions: You are allowed to use a scientific calculator to perform mathematical operations. Please silence and put away all cell phones and pagers! Part I. This section is multiple-choice. Fill in the letter corresponding to the best answer on your Scantron form #882.
1. The __________ and __________ contribute most to the mass of an atom, while the _____________ determines the atom’s chemical behavior. A. B. C. D. E. proton, neutron, electron proton, electron, neutron neutron, electron, proton proton, photon, neutron none of the above
2. The symbol 63 Cu represents an isotope of the element copper. Give the following values: atomic 29 number, mass number, number of neutrons, number of electrons, and number of protons. A. B. C. D. E. atomic # 63 63 29 29 29 mass number 29 29 63 63 92 # of neutrons 34 63 29 34 63 # of electrons 63 63 63 29 29 # of protons 63 29 63 29 29
3. Which of the following statements about isotopes is/are correct? i. ii. iii. iv. v. They have different masses. They have different numbers of neutrons. They have different electrical charges. No They have different numbers of protons. No They have different mass numbers. B. i, ii, and iv E. All are correct C. i, ii, and v
A. i and ii D. i, ii, iv, and v
4. There exist two stable isotopes of boron, and the average mass of a boron atom is 10.81 amu. Assuming you were able to isolate only a single boron atom, the chance that you would randomly get one with a mass of 10.81 amu is A. 0% B. 0.81% C. about 50% D. 10.81% E. 100%
5. Match the fundamental charge and mass with the appropriate subatomic particle: Charge = –1 Mass ≈ 0 amu proton proton electron electron neutron Charge = +1 Mass ≈ 1 amu neutron electron proton neutron proton Charge = 0 Mass ≈ 1 amu electron neutron neutron proton electron
A. B. C. D. E.
6. A particular element has two stable isotopes. One isotope has a mass of 34.969 amu and a natural abundance of 75.76%,...
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