June 2010 Chemistry Regents #80-83

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Questions

Base your answers to questions 80 through 83 on the information below.

Two sources of copper are cuprite, which has the IUPAC name copper(I) oxide, and malachite, which has the formula Cu2CO3(OH)2. Copper is used in home wiring and electric motors because it has good electrical conductivity. Other uses of copper not related to its electrical conductivity include coins, plumbing, roofing, and cooking pans. Aluminum is also used for cooking pans. At room temperature, the electrical conductivity of a copper wire is 1.6 times greater than an aluminum wire with the same length and cross-sectional area. At room temperature, the heat conductivity of copper is 1.8 times greater than the heat conductivity of aluminum. At STP, the density of copper is 3.3 times greater than the density of aluminum.

80 Write the chemical formula of cuprite. [1]

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Cu2O

81 Determine the oxidation number of oxygen in the carbonate ion found in malachite. [1]

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-2

82 Identify one physical property of copper that makes it a good choice for uses that are not related to electrical conductivity. [1]

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Copper is very malleable.

good conductor of heat

high melting point

pretty much anything you can think of that is not a chemical property

83 Identify one physical property of aluminum that could make it a better choice than copper for a cooking pan. [1]

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An aluminum pan has less mass than a copper pan of the same size because aluminum is less

dense.

Aluminum is less dense than copper.

A Cu pan would weigh more.

MY favorite=color, so the pans will match the pots

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