SCH4C Unit 1 Practice Quiz 2
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1 Name: Class: Date: SCH4C Unit 1 Practice Quiz 2 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. The smallest particle of an element that has all the properties of the element is A) an atom C) a particle B) a molecule D) a compound 2. In Thomson s raisin bun model, A) the dough represents the positively charged sphere, and the raisins represent the negatively charged electrons B) the dough represents the negatively charged sphere, and the raisins represent the positively charged electrons C) the dough represents an uncharged sphere, and the raisins represent the negatively or positively charged electrons D) none of the above 3. By conducting his gold foil experiment, Ernest Rutherford discovered A) the electron C) the nucleus B) the neutron D) the alpha particle 4. The nucleus is A) the negatively charged centre of the atom B) the positively charged centre of the atom C) the negatively charged outer region of the atom D) the positively charged outer region of the atom 5. The electron was discovered by 6. The proton was discovered by 7. The neutron was discovered by 8. Neutrons are A) found in the nucleus C) similar in mass to protons B) uncharged D) all of the above 9. Atoms of the same element that have a different number of neutrons are called A) isobars C) isotones B) isomers D) isotopes 10. The billiard ball model of the atom was proposed by 11. The raisin bun model of the atom was proposed by 12. The nuclear model of the atom was first proposed by 13. According to the law of electric charges, Rutherford s atom should have A) emitted ultraviolet light C) collapsed B) been very stable D) emitted X-rays 14. Niels Bohr was able to explain the line spectrum of A) helium C) neon B) hydrogen D) sodium 15. Bohr s theory is based on the fact that an electron s energy is A) negligible C) always the same B) very large D) quantized 16. Bohr compared the electrons in an atom to A) raisins in a bun C) planets orbiting the sun B) bees around a beehive D) stars in the sky 17. When an electron gains a specific amount of energy, A) it moves to a higher energy level C) it moves to its ground state B) it gives off light energy D) none of the above 1
2 Name: 18. An electron that occupies a higher energy level than normal is said to be in A) the wrong energy level C) a higher state B) an excited state D) the ground state 19. Electrons in their ground state A) are not moving C) do not emit any light energy B) give off light energy continually D) none of the above 20. Bohr s model was successful because A) it could explain the line spectrum of hydrogen B) it introduced the idea of quantized energy C) it explained why the atom did not collapse D) all of the above 21. Bohr s model was not the perfect model of the atom because it only explained A) the nucleus B) the line spectra of the first 20 elements C) the innermost electrons D) the line spectrum of hydrogen 22. Bohr predicted that each energy level could hold a maximum number of electrons. How many electrons could the first three energy levels hold? A) 2, 2, 6 C) 2, 4, 6 B) 2, 8, 8 D) 2, 4, The diagram above represents an atom whose electron is A) moving from the ground state to an excited state B) moving from an excited state to the ground state C) absorbing a quantum of energy D) none of the above 24. In the diagram above, the amount of electromagnetic radiation given off by the electron falling to a lower energy level will depend upon A) the element B) the number of electrons in the atom C) the energy difference in the energy levels D) nothing; it is always the same 25. The model of the atom, where electrons are in fixed orbits about the nucleus, was proposed by Short Answer 26. Although Dalton s model of the atom was very similar to the atom described by Democritus in the fifth century B.C., why is Dalton s model often considered the first atomic theory? 27. List the main ideas of Dalton s atomic theory. 28. Briefly outline Rutherford s model of the atom, and identify the main downfall of the model. 29. What observations did Rutherford make during his gold foil experiment, and what did he infer from these observations? 30. Explain how quantization of energy is analogous to a ball on a flight of steps. 31. According to Bohr s theory, how many electrons can be in each of the first three energy in levels in order for the atom to be stable? 32. Why was Bohr s model considered both a success and a failure? 2
3 SCH4C Unit 1 Practice Quiz 2 Answer Section MULTIPLE CHOICE 1. ANS: A 2. ANS: A REF: I OBJ: 1.3 LOC: MQ ANS: C 4. ANS: B 5. ANS: A 6. ANS: C 7. ANS: D 8. ANS: D 9. ANS: D 10. ANS: A 11. ANS: B 12. ANS: C 13. ANS: C REF: I OBJ: 1.6 LOC: MQ ANS: B REF: I OBJ: 1.6 LOC: MQ ANS: D REF: I OBJ: 1.6 LOC: MQ ANS: C REF: I OBJ: 1.6 LOC: MQ ANS: A REF: K/U OBJ: 1.6 LOC: MQ ANS: B REF: K/U OBJ: 1.6 LOC: MQ ANS: C REF: K/U OBJ: 1.6 LOC: MQ ANS: D REF: I OBJ: 1.6 LOC: MQ ANS: D REF: I OBJ: 1.6 LOC: MQ ANS: B REF: K/U OBJ: 1.6 LOC: MQ ANS: B REF: I OBJ: 1.6 LOC: MQ ANS: C REF: I OBJ: 1.6 LOC: MQ ANS: D REF: K/U OBJ: 1.6 LOC: MQ1.03 SHORT ANSWER 26. ANS: - Dalton s model was based on experimental evidence, while Democritus proposed his theory without experimentation 27. ANS: - matter consists of definite particles called atoms - each element is made up of its own type of atom - atoms of different elements have different properties - atoms of two or more elements can combine in constant ratios to form new substances - atoms cannot be created or destroyed or subdivided in a chemical change 28. ANS: - Rutherford s model had a positive core (nucleus), with negatively charged electrons around it occupying the remaining space - his model could not explain why the electrons did not spiral into the nucleus and cause the atom to collapse 29. ANS: - Rutherford observed that most of the alpha particles passed straight through the foil but some were deflected or reflected by the thin gold foil - he inferred that a small part of the atom, containing most of its mass, must have a dense positive charge to repel the positively charged alpha particle REF: K/U OBJ: 1.3 LOC: MQ1.01, MQ1.03 1
4 30. ANS: - the ball on the steps is restricted to specific levels; it cannot sit between steps - the ball can only possess fixed amounts (quanta) of energy, specific to each step REF: I OBJ: 1.6 LOC: MQ ANS: energy level 1 2 energy level 2 8 energy level 3 8 REF: K/U OBJ: 1.6 LOC: MQ ANS: - it was able to explain the line spectrum of hydrogen but no other elements - it was a breakthrough model in which electrons had quantized energy levels REF: I OBJ: 1.6 LOC: MQ1.03 2
5 SCH4C Unit 1 Practice Quiz 2 [Answer Strip] B 18. C 19. A 1. D 20. A 2. D 21. C 3. B 22. B 4. A 5. C 6. D 7. B 23. D 8. C 24. D 9. A 10. D 25. B 11. C 12. C 13. B 14. D 15. C 16. A 17.
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