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Chapter 2 - C The two have different atomic numbers D At...

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Chapter 2 1. Chlorine exists primarily as 37 Cl and 35 Cl and has an average atomic weight of 35.453. The abundance of Cl with atomic weight of 35 is A. 23% B. 91% C. 77% D. 45% E. None of the above is within 10% of the correct answer 2. How many protons, neutrons and electrons are present in 2 17 8 O ? A. p=8, n=9, e=10 B. p=8, n=9, e=8 C. p=8, n=9, e=6 D. p=9, n=8, e=11 E. p=9, n=8, e=9 3. X and Y are two species, each consisting of one nucleus and a number of electrons. The two species are found to contain the same number of protons, the same number of neutrons, and different numbers of electrons. Which of the following statements about X and Y is correct? A. X and Y are both neutral atoms. B. X and Y are isotopes of one another.
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Unformatted text preview: C. The two have different atomic numbers. D. At least one of the species is an ion. E. There is no answer above, since A D are all incorrect. 4. Which of the following chemical formulas is NOT the expected one for the compound named? A. Ga 2 O 3 gallium oxide B. AlCl 3 aluminum chloride C. Li 2 O lithium oxide D. MgBr magnesium bromide E. SrI 2 strontium iodide 5. Which of the following formulaname combinations is(are) correct ? 1. NH 4 Cl 2 ammonium chloride 2. K 2 CO 3 potassium carbonate 3. Ca 3 (PO 4 ) 2 calcium phosphate The correct combination(s) is(are) A. 1 only B. 2 only C. 1 and 3 only D. 2 and 3 only E. 1 and 2 only...
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