General Chem I: Exam Review

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Gen Chem I

Exam 1 Review (Chapters 1 & 2)

Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. All of the following are properties of antimony. Which one is not a physical property? a. It is a solid at room temperature. b. It has both yellow and gray forms (allotropes) in the solid state. c. It burns in an atmosphere of chlorine. d. It is one of the few substances that expands upon freezing. e. The gray form melts at 631°C. 2. The following properties describe zinc. Which one(s) is (are) chemical properties? I. II. III. IV. V. It is bluish-white metal. It corrodes upon prolonged contact with moist air. Its density is 7.14 g/cm3. It melts at 419°C. It conducts electricity. d. II, IV, and V e. II

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a. IV and V b. IV c. V ____

3. Identify which of the following properties of methane would be observed only with a change in composition. a. The melting point is −182.5°C. d. The boiling point is −161.5°C. b. The density is 6.67 × 10-4 g/cm3. e. It dissolves slightly in water. c. Carbon dioxide forms when it burns.

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4. Which of these physical changes would require the liberation of energy? a. condensation of steam to form liquid water b. melting of ice c. boiling of water d. all of the above e. none of the above

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5. Which answer lists all the substances below that are compounds and not any elements or mixtures? I. II. III. IV. V. ethyl alcohol neon sulfur water crude oil d. II, III, and V e. I and IV

a. I, II, and III b. I, IV, and V c. IV and V

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____ 6. A sample of matter that can be decomposed into three different elements a. must be a solution. b. must be a compound. c. must be a heterogeneous mixture. d. must be a homogeneous mixture. e. could be any of the preceding four answers.

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7. Below is a list of common prefixes used in the SI and metric systems.