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Chapter 1: Problem 116

Which of the following describes a chemical property? a. The density of iron is 7.87 \(\mathrm{g} / \mathrm{cm}^{3} .\) b. A platinum wire glows red when heated. c. An iron bar rusts. d. Aluminum is a silver-colored metal.

Short Answer

Expert verified
The statement that describes a chemical property is "An iron bar rusts" (option c), as it involves a chemical change and the formation of a new substance.

Step by step solution

01

Analyze option a.

The density of iron is given as 7.87 g/cm³. Density is a physical property because it can be measured without any chemical change occurring. Hence, option a is not a chemical property.
02

Analyze option b.

A platinum wire glows red when heated. This statement describes a physical change that occurs as a result of heat. There is no new substance formed in the process, so it is a physical property and not a chemical property. Option b is also not a chemical property.
03

Analyze option c.

An iron bar rusts. Rusting is a process that involves a chemical reaction between iron and oxygen in the presence of moisture, forming a new substance called iron oxide or rust. This statement describes a chemical change as it involves the formation of a new substance. Hence, option c is a chemical property.
04

Analyze option d.

Aluminum is a silver-colored metal. Color is a characteristic that can be observed without undergoing any chemical change. Therefore, color is a physical property, not a chemical property. Option d is not a chemical property.
05

Final answer.

Based on the analysis in the previous steps, the statement that describes a chemical property is "An iron bar rusts" (option c).

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