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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