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# Scan_Doc0041 - Connecting to Biochemistry 35 69 In a b c...

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69. In each of the following pairs, which has the greater volume? a. 1.0 kg of feathers or 1.0 kg of lead b. 100 g of gold or 100 g of water c. 1.0 L of copper or 1.0 L of mercury 70. Using Table 1.5, calculate the volume of 25.0 g of each of the following substances at 1 atm. a. hydrogen gas b. water c. iron Chapter 5 discusses the properties of gases. One property unique to gases is that they contain mostly empty space. Explain using the results of your calculations. 1. The density of osmium (the densest metal) is 22.57 g/crrr'. If a 1.00-kg rectangular block of osmium has two dimensions of 4.00 em X 4.00 ern, calculate the third dimension of the block. 72. A copper wire (density = 8.96 g/cnr') has a diameter of 0.25 mm. If a sample of this copper wire has a mass of 22 g, how long is the wire? Classification and Separation ofMatter 73. Match each description below with the following microscopic pictures. More than one picture may fit each description. A pic- ture may be used more than once or not used at all. ii Hi iv vi v a. a gaseous compound b. a mixture of two gaseous elements c. a solid element d. a mixture of a gaseous element and a gaseous compound 74. Define the following terms: solid, liquid, gas, pure substance, el-
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