第一章

Introduction to Basic Chemistry:This first chapter discusses solids, liquids and gases then continues to look at elements and compounds. Later sections explain the maths you need to understand on the course.1.1Classification of Matter:Matter will be classified in terms of solids, liquids, gases and plasma.
1.2Elements and Compounds:Elements are bonded together to form compounds. This short section discusses the difference between both concepts.
1.3Physical and Chemical Changes:The difference between physical and chemical properties of substances is highlighted via a series of examples.
1.4Units of Measurement:In this sub-topic, the seven SI base units and derived units are described.
1.5Significant Figures:Significant figures are necessary to know for calculations in analytical chemistry. The number of decimal points used in quoting a number, and scientific notation are also included.
1.6Standard Deviation:The mathematics in chemistry is not particularly challenging. Averages and standard deviations, however, are discussed in a number of calculations.
[单选题]The temperature of 25°C is __________ in kelvins.

选项:[138, 298, 103, 166, 248]
[单选题]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.

选项:[0.00155, 5.84, 10.5, 644, 0.171]
[单选题]Accuracy refers to __________.

选项:[how close a measured number is to infinity, how close a measured number is to other measured numbers, how close a measured number is to the true value, how close a measured number is to zero, how close a measured number is to the calculated value]
[单选题]In which one of the following numbers are all of the zeros significant?

选项:[0.003002, 100.09009, 0.05843, 0.1, 0.14329]
[单选题]Solids have a __________ shape and are not appreciably __________.

选项:[indefinite, incompressible, indefinite, compressible, definite, incompressible, definite, compressible, sharp, convertible]
[单选题]The SI unit for mass is __________.

选项:[gram, kilogram, troy ounce, pound]
[单选题]There are __________ significant figures in the answer to the following computation: (29.2 - 20.0) (1.79 × 105)/1.39

选项:[4, 3, 1, 5, 2]
[单选题]The correct result of the molecular mass calculation for H2SO4 is ________. 4 × 15.9994 + 32.066 + 2 × 1.0079

选项:[98.838, 98.074, 98.08, 98.84, 98.079]
[单选题]The symbol for the element potassium is __________.

选项:[S, Pt, Ca, K, P]
[单选题]Of the following, __________ is the smallest mass.

选项:[2.5 × 109 fg, 2.5 × 10-2 mg, 2.5 × 1010 ng, 2.5 × 1015 pg, 25 kg]

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