第一章[单选题]The temperature of 25°C is __________ in kelvins.选项:[138, 298, 103, 166, 248]
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 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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