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第一章测试
Mixtures and pure substances can be separated by physical.( )A:对B:错答案:A
Celsius is the unit of the temperature.( )A:对B:错答案:A
Systematic errors caused by limitations in an experimenter’s skill or ability to read a scientific instrument. ( )A:对B:错答案:B
In physical change, some of the physical properties of the sample may change, and its composition changed.( )A:错B:对答案:B
There is a temperature at which °C and °F have the same value.( )A:对B:错答案:A
第二章测试
Cathode rays are deflected (偏转) in an electric field( )A:对B:错答案:A
STP usually refers to the temperature of 0℃ and the pressure of 101.325 kPa( )A:错B:对答案:B
Alkali metals are all first period elements( )A:对B:错答案:B
There are as many electrons outside the nucleus as there are units of positive charge on the nucleus. The atom as a whole is electrically neutral( )A:对B:错答案:A
X-rays are harmless to the human body( )A:对B:错答案:B
第三章测试
The oxidation state of the underlined element KO2 is -1/2.( )A:对B:错答案:A
The mass percent O in the mineral malachite, Cu2(OH)2CO3 (Cu=64) is 33.04%.( )A:错B:对答案:B
The empirical formula of Pentane is CH.( )A:对B:错答案:A
C6H10O2 has the same empirical formula as aspidinol, C12H16O4 , a drug used to kill parasitic worms.( )A:对B:错答案:A
CH3CH(CH2CH3)CH2OH and CH3CH2CH2CH2CH2OH are isomers.( )A:错B:对答案:B
第四章测试
Dry ice is pure.( )A:错B:对答案:B
0873 has four significant numbers. ( )A:错B:对答案:A
876 has four significant numbers.( )A:错B:对答案:B
Ferric oxide is FeO.( )A:对B:错答案:B
Mercury is a metallic element.( )A:对B:错答案:A
第五章测试
Acetic acid cannot disassociates completely.( )A:错B:对答案:B
The reducing agent gains electrons in the reaction. ( )A:对B:错答案:B
The oxidizing agent causes another substance to be reduced.( )A:错B:对答案:A
Sulfuric acid cannot disassociates completely.( )A:错B:对答案:A
1M HCl is more acidic than 0.1M H2SO4.( )A:错B:对答案:A
第六章测试
Gases have much lower densities than liquids and solids.( )A:对B:错答案:A
There is a certain amount of gas i
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