Introduction to Atomic Structure Multiple Choice HW
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1 Introduction to Atomic Structure Multiple Choice HW PSI Chemistry Name Energy and Light 1. What principle is responsible for the pattern below: 2. This principal is also known as light bending around corners. 3. Young s Double Slit experiment proves light is A. A Wave B. A Particle C. Both a Wave and a Particle D. Neither a Wave nor a Particle 4. If the frequency of an EM-wave doubles, what happens to the wave s wavelength?
2 5. If the wavelength of an EM-wave quadruples, what happens to the wave s frequency? 6. Which color of light has a longer wavelength? 7. Which color of light has a higher frequency? 8. When something that shouldn t glow does, but only if it has absorbed enough heat it is because of what principal? 9. If the frequency of a photon triples, what happens to the photon s Energy? 10. If the wavelength of a photon is cut in half, what happens to the photon s Energy?
3 11. Which color of light has the highest energy? 12. Which color of light has the least energy? 13. This is what happens when light strikes a metal, causing it to give off electrons. 14. Einstein proved, using Planck s equation and the Photoelectric Effect, that light is this A. A Wave B. A Particle C. Both a Wave and a Particle D. Neither a Wave nor a Particle 15. We now know light is in fact A. A Wave B. A Particle C. Both a Wave and a Particle D. Neither a Wave nor a Particle Structure of the Atom 16. What was the first particle discovered inside an atom?
4 17. What characteristic of cathode rays led scientists to believe that they were negatively charged? A. They were small B. They were easily deflected C. The were deflected towards a positive electrode D. They moved quickly E. They were found in all atoms 18. Millikan discovered the charge of this subatomic particle by calculating the charge of small oil droplets. 19. Of the three types of radioactivity characterized by Rutherford, which are particles? A. β-rays B. α-rays, β-rays, and γ-rays C. γ-rays D. α-rays and γ-rays E. α-rays and β-rays 20. Which form of radiation has a positive charge? A. α B. β C. γ D. δ 21. The gold foil experiment. A. confirmed the plum-pudding model of the atom B. led to the discovery of the atomic nucleus C. was the basis for Thomson's model of the atom D. utilized the deflection of beta particles by gold foil E. proved the law of multiple proportions 22. The nucleus of an atom does not contain. A. protons B. protons or neutrons C. neutrons D. subatomic particles E. electrons
5 23. Which sub atomic particle has the smallest mass? 24. Which sub atomic particle has a positive charge? Counting Subatomic Particles 25. The atomic number indicates. A. the number of neutrons in a nucleus B. the total number of neutrons and protons in a nucleus C. the number of protons in a neutral atom D. the number of atoms in 1 g of an element E. the number of different isotopes of an element 26. In the symbol, x 6C, x is. A. the number of neutrons B. the atomic number C. the mass number D. the isotope number E. the elemental symbol 27. There are electrons, protons, and neutrons in an atom of Cs. A. 132, 132, 54 B. 54, 54, 132 C. 78, 78, 54 D. 55, 55, 78 E. 78, 78, Which isotope has 45 neutrons? A Kr B Br C Se D Cl E Rh
6 29. How many electrons are in an Iron atom? A. 23 B. 26 C. 27 D. 28 answers 30. How many electrons are in the ion Fe +3? A. 23 B. 26 C. 27 D. 28 answers 31. How many electrons are in the ion Cl -? A. 16 B. 17 C. 18 D. 36 answers Isotopes and Average Atomic Mass 32. Different isotopes of a particular element contain the same number of. A. protons B. neutrons C. protons and neutrons D. subatomic particles E. protons, neutrons, and electrons 33. Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is amu. Isotope % Mass 40 X X X A B C D E
7 ANSWER KEY 1. B 2. A 3. A 4. C 5. E 6. D 7. C 8. C 9. B 10. A 11. C 12. D 13. D 14. B 15. C 16. C 17. C 18. C 19. E 20. A 21. B 22. E 23. C 24. A 25. C 26. C 27. D 28. B 29. B 30. A 31. C 32. A 33. A
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