Unit 2 Review - Chemistry I Unit 2 Review 1. How many of...

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Chemistry I Unit 2 Review 1. How many of the following did Dalton not discuss in his atomic theory? isotopes ions protons electrons neutrons A) 1 B) 2 C) 3 D) 4 E) 5 2. Which of the following statements are true ? I. Models are always wrong unless they are proved by a theory. II. Elements, such as lead, are made of tiny particles that mostly consist of open space. III. The air you breathe is an example of a heterogeneous mixture. IV. Because NH 3 always contains the same relative numbers of atoms, it will always contain 4.6 g of nitrogen for every 1.0 g of hydrogen. A) II only B) II, IV C) I, II, IV D) I, III E) All of the above statements are true. 8. An element's most stable ion forms an ionic compound with chlorine having the formula XCl 2 . If the ion of element X has a mass of 89 and 36 electrons, what is the identity of the element, and how many neutrons does it have? A) Kr, 53 neutrons B) Kr, 55 neutrons C) Se, 55 neutrons D) Sr, 51 neutrons E) Rb, 52 neutrons 9. How many protons, electrons, and neutrons, respectively, does 16 O have? A) 8, 18, 8 B) 8, 8, 8 C) 8, 10, 8 D) 8, 14, 8 E) 8, 18, 16 11. An atom with 15 protons and 16 neutrons is an atom of A) P B) Ga C) S D) Pd E) Rh 13. The average mass of a boron atom is 10.81. Assuming you were able to isolate only one boron atom, the chance that you would randomly get one with a mass of 10.81 is A) 0% B) 0.81% C) about 11% D) 10.81% E) greater than 50% 15. The atom with 67 neutrons and 50 protons has a mass number of A) 67 B) 50 C) 17 D) 117 E) cannot be determined from information given . 16. How many neutrons are there in one atom of 48 22 Ti? A) 22 B) 26 C) 48 D) 70 E) none of these 18. How many neutrons are contained in an iodine nucleus with a mass number of 131? A) 53 B) 74 C) 78 D) 127 E) 131 20. How many electrons are present in a tin atom with a mass number of 119? A) 50 B) 119 C) 169 D) 69 E) 6.02 × 10 23 21. The number of protons in 200 80 Hg is A) 80 B) 120 C) 200 D) dependent on ionic charge E) unknown 23. An atom that has 54 protons, 54 electrons, and 78 neutrons is A) 132 54 Xe B) 132 55 Cs C) 78 54 Xe D) 54 78 Pt Page 1
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E) 108 78 Pt 24. The number of protons in the nucleus of an atom is called its A) mass number B) valence C) isotope number D) atomic number E) none of these 25. The number of neutrons in 5 3 Li is A) 8 B) 7 C) 5 D) 2 E) 1 26. Which pair have approximately the same mass? A)
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Unit 2 Review - Chemistry I Unit 2 Review 1. How many of...

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