Basic Chemistry 基础化学答案2023秋

第一章测试

1.Solids have a __________ shape and are not appreciably __________.
A:indefinite, compressible B:sharp, convertible C:indefinite, incompressible D:definite, incompressible E:definite, compressible
答案:E
2.The symbol for the element potassium is __________.
A:Pt B:P C:S D:K E:Ca
答案:D
3.

The SI unit for mass is __________.

A:

pound

B:

troy ounce

C:

gram

D:

kilogram

答案:D
4.The temperature of 25°C is __________ in kelvins.
A:248 B:138 C:298 D:103 E:166
答案:C
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:5.84 B:0.171 C:644 D:0.00155 E:10.5
答案:A
6.The correct result of the molecular mass calculation for H2SO4 is ________. 4 × 15.9994 + 32.066 + 2 × 1.0079
A:98.838 B:98.074 C:98.079 D:98.84 E:98.08
答案:C
7.There are __________ significant figures in the answer to the following computation: (29.2 - 20.0) (1.79 × 105)/1.39
A:5 B:1 C:3 D:2 E:4
答案:D
8.Of the following, __________ is the smallest mass.
A:2.5 × 10-2 mg B:2.5 × 1015 pg C:2.5 × 109 fg D:25 kg E:2.5 × 1010 ng
答案:C
9.Accuracy refers to __________.
A:how close a measured number is to the true value B:how close a measured number is to zero C:how close a measured number is to other measured numbers D:how close a measured number is to the calculated value 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:100.09009 B:0.003002 C:0.05843 D:0.14329 E:0.1
答案:A