PE1b - CHM 111 Name_________________________________ Exam 1...

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Unformatted text preview: CHM 111 Name_________________________________ Exam 1 Part 1. Multiple Choice (33%) Choose the one alternative that best completes the statement or answers the question. USE CAPITAL LETTERS. 1) Which of the following has the greatest mass? A) 16.0 g of O 2 B) 6.02 × 10 23 molecules of O 2 C) 0.500 mol of O 2 D) All of the above have the same mass. 1) 2) The current model of the atom in which essentially all of an atom ȇ s mass is contained in a very small nucleus, whereas most of an atom ȇ s volume is due to the space in which the atom ȇ s electrons move was established by A) Rutherford ȇ s gold foil experiment. B) None of the above. C) Millikan ȇ s oil drop experiment. D) Thomson ȇ s cathode ray tube experiment. 2) 3) How many protons (p) and neutrons (n) are in an atom of 90 38 Sr? A) 52 p, 38 n B) 38 p, 90 n C) 90 p, 38 n D) 38 p, 52 n 3) 4) Which of the following is a part of Dalton ȇ s atomic theory? A) Atoms break down during radioactive decay. B) Atoms are rearranged but not changed during a chemical reaction. C) Isotopes of the same element have different masses. D) Atoms contain protons, neutrons, and electrons. 4) 5) Elements A and Q form two compounds. The ratio (mass Q)/(mass A) for compound one is 0.271 and ratio (mass Q)/(mass A) for compound two is 0.362. If compound one has the chemical formula AQ, what is the chemical formula for compound two? A) AQ 2 B) A 2 Q 3 C) AQ 3 D) A 3 Q 4 5) 6) How many grams of AgNO 3 are needed to make 250. mL of a solution that is 0.135 M?...
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This note was uploaded on 02/29/2012 for the course CHM 111 taught by Professor Colyer during the Summer '08 term at Wake Forest.

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PE1b - CHM 111 Name_________________________________ Exam 1...

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