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1 | | The existence of Cu2O and CuO illustrates: |
| | A) | the law of conservation of mass |
| | B) | the law of multiple proportions |
| | C) | the law of definite proportions |
| | D) | A and B |
| | E) | A, B, and C |
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2 | | Rutherford's experiment with alpha particle scattering by gold foil established that: |
| | A) | Electrons have negative charges. |
| | B) | Protons are 1840 times heavier than electrons. |
| | C) | Protons are not evenly distributed throughout an atom. |
| | D) | Atoms are composed of protons, neutrons, and electrons. |
| | E) | Protons are located in the nucleus of an atom. |
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3 | | How many protons, neutrons, and electrons are there in an atom of chlorine-39? |
| | A) | 17 protons, 17 neutrons, and 22 electrons |
| | B) | 39 protons, 38 neutrons, and 39 electrons |
| | C) | 22 protons, 17 neutrons, and 17 electrons |
| | D) | 17 protons, 39 neutrons, and 17 electrons |
| | E) | 17 protons, 22 neutrons, and 17 electrons |
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4 | | Two isotopes of an element differ in their: |
| | A) | chemical symbols |
| | B) | atomic masses |
| | C) | atomic numbers |
| | D) | numbers of protons |
| | E) | numbers of electrons |
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5 | | Which of the following is not an example of an alkali metal? |
| | A) | Li |
| | B) | Cs |
| | C) | At |
| | D) | K |
| | E) | Rb |
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6 | | How many protons and electrons are present in a Ca2+ ion? |
| | A) | 20 protons and 18 electrons |
| | B) | 18 protons and 20 electrons |
| | C) | 20 protons and 21 electrons |
| | D) | 20 protons and 19 electrons |
| | E) | 22 protons and 20 electrons |
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7 | | What is the formula for the ionic compound formed by calcium ions and phosphate ions? |
| | A) | CaPO4 |
| | B) | Ca2(PO4)2 |
| | C) | Ca(PO4)3 |
| | D) | Ca3PO4 |
| | E) | Ca3(PO4)2 |
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8 | | The correct Stock system name for CoCl3 is: |
| | A) | cobaltous chloride |
| | B) | cobalt trichloride |
| | C) | cobalt(III) chloride |
| | D) | cobalt(III) trichloride |
| | E) | cobalt chloride |
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9 | | The correct name of (NH4)2SO3 is: |
| | A) | ammonia sulfite |
| | B) | ammonium sulfate |
| | C) | ammonia sulfate |
| | D) | ammonium sulfite |
| | E) | ammonium hyposulfite |
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10 | | The correct Stock system name for CuSO4. 5 H2O is: |
| | A) | cuprous sulfate pentahydrate |
| | B) | copper(II) sulfate pentahydrate |
| | C) | copper(II) sulfate hydrate |
| | D) | copper(I) sulfate pentahydrate |
| | E) | copper sulfate pentahydrate |
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11 | | Who were the scientists most responsible for the present day model of the atom? |
| | A) | Marie Curie and Husband |
| | B) | Rutherford and Associates |
| | C) | Robert Andrews Millikan |
| | D) | Wilhelm Röntgen and Antoine Becquerel |
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12 | | A molecule is _________ |
| | A) | an atom or group of atoms with a net positive charge. |
| | B) | an atom or group of atoms with a net negative charge. |
| | C) | at least two atoms in a definite arrangement held together by chemical bonds. |
| | D) | a single element with a different number of neutrons than the original. |
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13 | | Polyatomic molecules contain: |
| | A) | two different types of atoms |
| | B) | two of the same types of atoms |
| | C) | only two atoms of the same or different type |
| | D) | more than two atoms of the same or different type |
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14 | | Common examples of diatomic molecules from Group 7A elements include: |
| | A) | fluorine, hydrogen, and nitrogen |
| | B) | nitrogen, chlorine, and bromine |
| | C) | chlorine, bromine, and iodine |
| | D) | iodine, lead, and oxygen |
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15 | | What is the correct empirical formula ratio for hydrazine? |
| | A) | 1:2 |
| | B) | 1:1 |
| | C) | 2:2 |
| | D) | 2:4 |
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