Basic Chemistry 基础化学章节测试课后答案2024春

第一章测试

1.Solids have a __________ shape and are not appreciably __________.
A:definite, compressible B:indefinite, compressible C:indefinite, incompressible D:definite, incompressible E:sharp, convertible
答案:A
2.The symbol for the element potassium is __________.
A:Pt B:P C:S D:Ca E:K
答案:E
3.The SI unit for mass is __________.
A:gram B:troy ounce C:pound D:kilogram
答案:D
4.The temperature of 25°C is __________ in kelvins.
A:248 B:298 C:166 D:103 E:138
答案:B
5.The density of silver is 10.5 g/cm3. A piece of silver with a mass of 61.3 g would occupy a volume of __________ cm3.
A:10.5 B:644 C:0.00155 D:5.84 E:0.171
答案:D
6.The correct result of the molecular mass calculation for H2SO4 is ________. 4 × 15.9994 + 32.066 + 2 × 1.0079
A:98.079 B:98.074 C:98.08 D:98.84 E:98.838
答案:A
7.There are __________ significant figures in the answer to the following computation: (29.2 - 20.0) (1.79 × 105)/1.39
A:4 B:2 C:5 D:1 E:3
答案:B
8.Of the following, __________ is the smallest mass.
A:2.5 × 10-2 mg B:25 kg C:2.5 × 1010 ng D:2.5 × 109 fg E:2.5 × 1015 pg
答案:D
9.Accuracy refers to __________.
A:how close a measured number is to the true value B:how close a measured number is to other measured numbers C:how close a measured number is to the calculated value D:how close a measured number is to zero E:how close a measured number is to infinity
答案:A
10.In which one of the following numbers are all of the zeros significant?
A:0.1 B:100.09009 C:0.05843 D:0.003002 E:0.14329
答案:B