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Chapter 3 Preview Multiple Choice Short Answer Extended Response Standardized Test Preparation Chapter 3 Preview Multiple Choice Short Answer Extended Response

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 1. A chemical compound always has the same elements in the same proportions by mass regardless of the source of the compound. This is a statement of A. the law of multiple proportions. B. the law of isotopes. C. the law of definite proportions. D. the law of conservation of mass.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 1. A chemical compound always has the same elements in the same proportions by mass regardless of the source of the compound. This is a statement of A. the law of multiple proportions. B. the law of isotopes. C. the law of definite proportions. D. the law of conservation of mass.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 2. An important result of Rutherford’s experiments with gold foil was to establish that A. atoms have mass. B. electrons have a negative charge. C. neutrons are uncharged particles. D. the atom is mostly empty space.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 2. An important result of Rutherford’s experiments with gold foil was to establish that A. atoms have mass. B. electrons have a negative charge. C. neutrons are uncharged particles. D. the atom is mostly empty space.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 3. Which subatomic particle has a charge of +1? A. electron B. neutron C. proton D. meson

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 3. Which subatomic particle has a charge of +1? A. electron B. neutron C. proton D. meson

Chapter 3 Multiple Choice 4. Which particle has the least mass? Standardized Test Preparation Chapter 3 Multiple Choice 4. Which particle has the least mass? A. electron B. neutron C. proton D. All have the same mass.

Chapter 3 Multiple Choice 4. Which particle has the least mass? Standardized Test Preparation Chapter 3 Multiple Choice 4. Which particle has the least mass? A. electron B. neutron C. proton D. All have the same mass.

Chapter 3 Multiple Choice 5. Cathode rays are composed of Standardized Test Preparation Chapter 3 Multiple Choice 5. Cathode rays are composed of A. alpha particles. B. electrons. C. protons. D. neutrons.

Chapter 3 Multiple Choice 5. Cathode rays are composed of Standardized Test Preparation Chapter 3 Multiple Choice 5. Cathode rays are composed of A. alpha particles. B. electrons. C. protons. D. neutrons.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 6. The atomic number of an element is the same as the number of A. protons. B. neutrons. C. protons + electrons. D. protons + neutrons.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 6. The atomic number of an element is the same as the number of A. protons. B. neutrons. C. protons + electrons. D. protons + neutrons.

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 7. How many neutrons are present in an atom of tin that has an atomic number of 50 and a mass number of 119? A. 50 B. 69 C. 119 D. 169

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 7. How many neutrons are present in an atom of tin that has an atomic number of 50 and a mass number of 119? A. 50 B. 69 C. 119 D. 169

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 8. What is the mass of 1.50 mol of sodium, Na? A. 0.652 g B. 0.478 g C. 11.0 g D. 34.5 g

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 8. What is the mass of 1.50 mol of sodium, Na? A. 0.652 g B. 0.478 g C. 11.0 g D. 34.5 g

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 9. How many moles of carbon are in a 28.0 g sample? A. 336 mol B. 72.0 mol C. 2.33 mol D. 0.500 mol

Chapter 3 Multiple Choice Standardized Test Preparation Chapter 3 Multiple Choice 9. How many moles of carbon are in a 28.0 g sample? A. 336 mol B. 72.0 mol C. 2.33 mol D. 0.500 mol

Standardized Test Preparation Chapter 3 Short Answer 10. Which atom has more neutrons, potassium-40 or argon-40?

Standardized Test Preparation Chapter 3 Short Answer 10. Which atom has more neutrons, potassium-40 or argon-40? Answer: Argon-40 has 22 neutrons (40 − 18 = 22), and potassium-40 has 21 neutrons (40 − 19 = 21).

Standardized Test Preparation Chapter 3 Short Answer 11. What is the mass of 1.20 × 1023 atoms of phosphorus?

Standardized Test Preparation Chapter 3 Short Answer 11. What is the mass of 1.20 × 1023 atoms of phosphorus? Answer: 6.17 g

Chapter 3 Extended Response Standardized Test Preparation Chapter 3 Extended Response 12. Cathode rays emitted by a piece of silver and a piece of copper illustrate identical properties. What is the significance of this observation?

Chapter 3 Extended Response Standardized Test Preparation Chapter 3 Extended Response 12. Cathode rays emitted by a piece of silver and a piece of copper illustrate identical properties. What is the significance of this observation? Answer: All cathode rays are the same, regardless of their source. Therefore, the particles responsible for the cathode rays must be present in all atoms. The particles are electrons.

Chapter 3 Extended Response Standardized Test Preparation Chapter 3 Extended Response 13. A student believed that she had discovered a new element and named it mythium. Analysis found it contained two isotopes. The composition of the isotopes was 19.9% of atomic mass 10.013 and 80.1% of atomic mass 11.009. What is the average atomic mass, and do you think mythium was a new element?

Chapter 3 Extended Response Standardized Test Preparation Chapter 3 Extended Response 13. A student believed that she had discovered a new element and named it mythium. Analysis found it contained two isotopes. The composition of the isotopes was 19.9% of atomic mass 10.013 and 80.1% of atomic mass 11.009. What is the average atomic mass, and do you think mythium was a new element? Answer: When the average atomic mass is calculated, it is 10.811. Because the atomic mass is the same as the atomic mass of boron, mythium was not a new element.