智慧树知到《基础化学（Basic Chemistry）》章节测试答案

第一章单元测试

1、Solids have a（）shape and are not appreciably（）.

A.sharp， convertible

B.indefinite， compressible

C.indefinite， incompressible

D.definite， incompressible

E.definite， compressible

正确答案：definite， compressible

2、The symbol for the element potassium is（）.

A.S

B.Ca

C.P

D.Pt

E.K

正确答案：K

3、The SI unit for mass is（）.

A.pound

B.kilogram

C.gram

D.troy ounce

正确答案：kilogram

4、The temperature of 25°C is（）in kelvins.

A.166

B.248

C.298

D.103

E.138

正确答案：298

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.644

B.5.84

C.10.5

D.0.171

E.0.00155

正确答案：5.84

6、The correct result of the molecular mass calculation for H2SO4 is（）.4 × 15.9994 + 32.066 + 2 × 1.0079

A.98.079

B.98.84

C.98.838

D.98.08

E.98.074

正确答案：98.079

7、There are（）significant figures in the answer to the following computation：（29.2 - 20.0） （1.79 × 105）/1.39

A.3

B.1

C.4

D.5

E.2

正确答案：2

8、Of the following，（）is the smallest mass.

A.25 kg

B.2.5 × 1010 ng

C.2.5 × 109 fg

D.2.5 × 10-2 mg

E.2.5 × 1015 pg

正确答案：2.5 × 109 fg

9、Accuracy refers to（）.

A.how close a measured number is to infinity

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 the true value

E.how close a measured number is to zero

正确答案：how close a measured number is to the true value

10、In which one of the following numbers are all of the zeros significant？

A.100.09009

B.0.003002

C.0.14329

D.0.1

E.0.05843

正确答案：100.09009

第二章单元测试

1、A certain mass of carbon reacts with 13.6 g of oxygen to form carbon monoxide.（）grams of oxygen would react with that same mass of carbon to form carbon dioxide， according to the law of multiple proportions？

A.136

B.25.6

C.27.2

D.6.8

E.13.6

正确答案：27.2

2、Which statement below correctly describes the responses of alpha， beta， and gamma radiation to an electric field？