Midterm I KEY Au10

Midterm I KEY Au10 - Midterm Exam I - Autumn 2010 Average =...

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Midterm Exam I - Autumn 2010 Average = 129 points = 71.7% = C/C+ High = 180 points (6 students with perfect score) Low = 48 points 1. In which of the following pairs are both chemical properties? a) freezes at 10ºC and nonflammable physical/chemical b) decomposes at 500ºC and reacts with bromine chemical/chemical c) poor conductor of heat and is reddish brown in color physical/physical d) has a low density and is very hard physical/physical e) flammable and high specific heat chemical/physical 2. Methane has a melting point of -183 o C and a boiling point of -162 o C. In what state does methane exist at -175 o C? a) a solution b) a colloid -183 -175 -162______ o C c) a gas solid m.p. liquid b.p. gas d) a liquid e) a solid 3. Which of the following statements is NOT true of mixtures? a) Mixtures consist of two or more substances. b) Mixtures can be separated by physical means. c) Solutions are homogeneous mixtures. d) Properties of mixtures can vary with composition. e) Homogeneous mixtures contain visibly different parts, or phases. (Heterogeneous mixtures contain visibly different parts, or phases = True) 4. A pure substance F is found to change upon heating into two new pure substances M and Y. Both M and Y may be decomposed by chemical means. From this we may conclude that: a) F is an element, M and Y are compounds. b) F is a compound, M and Y are elements. c) F, M and Y are all elements. d) F, M and Y are all compounds. e) Insufficient information is provided. 1
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5. What are the chemical symbols for gold, copper, lead, and arsenic? a)
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Fall '08 term at Ohio State.

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Midterm I KEY Au10 - Midterm Exam I - Autumn 2010 Average =...

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