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WorksheetsTopic 4 Composition of Matter - Review
Total questions: 20
Worksheet time: 15mins
What is the definition of an element?
A pure substance consisting of only one type of atom.
A mixture of two or more substances.
A substance that can be broken down into simpler substances by chemical means.
A compound formed by the combination of two or more elements.
What is the definition of a compound?
A substance composed of elements must be an element.
True
False
Which of the following substances are composed of molecules?
Water
Carbon dioxide
Benzene
Iron
Which of the following substances are composed of atoms?
Oxygen
Iron
Diamond
Table salt
下列物质中由离子组成的有哪些？
氧化钠
氯化钾
盐酸
硫酸铜
下列不属于微粒性质的是
微粒（体积和质量）很小
微粒无时无刻的不不断运动
微粒间有一定空隙
分子是保持物质化学性质的最小微粒
高锰酸钾KMnO4中，锰元素的化合价是
+5
+7
氯酸钾KClO3中，氯元素的化合价是
+5
+7
什么是相对原子质量Ar？
相对原子质量是指某一原子的质量与碳-12原子质量的1/12之比。
相对原子质量是指原子的体积与水的体积之比。
相对原子质量是指原子的质量与氧气分子的质量之比。
相对原子质量是指原子的质量与氢原子的质量之比。
请问你怎么获得相对原子质量Ar？
根据定义进行计算
查元素周期表，元素所在cell里最靠前/最大的那个
查元素周期表，元素所在cell里最靠后/最小的那个
什么是式量/相对分子质量Mr？
式量/相对分子质量是指一个分子的质量与碳-12原子质量的1/12之比。
式量/相对分子质量是指一个分子的质量与氢原子质量的1/2之比。
式量/相对分子质量是指一个分子的质量与氧原子质量的1/16之比。
式量/相对分子质量是指一个分子的质量与氮原子质量的1/14之比。
Which of the following descriptions about the amount of substance is incorrect?
Represents the amount of particles
The unit is mole
The symbol is mol
The value is less than or equal to 6.02∗1023
Which of the following descriptions about molar mass is incorrect?
The value is equal to the relative molecular mass
The value is equal to the relative atomic mass
The unit is g/mol
The symbol is M
Which of the following descriptions about molar mass is incorrect?
The mass of 1 mol of a substance is the molar mass
The molar mass is equal to the mass of the substance in grams divided by the relative molecular mass
The unit of molar mass is g
The unit of molar mass is g/mol
Given the mass of a substance, please write the formula for calculating the amount of substance.
Amount of substance (mol) = mass (g) / molar mass (g/mol)
Amount of substance (mol) = molar mass (g/mol) / mass (g)
Amount of substance (mol) = mass (g) × molar mass (g/mol)
Amount of substance (mol) = mass (g) + molar mass (g/mol)
The ratio of the amount of substances between substances represented by a chemical equation is
True
False
Which of the following must change before and after a chemical reaction?
Number of atoms
Number of molecules
Type of substance
Total amount of substance in the reactants and products
化学反应方程式可以可以提供哪些信息
反应物, 生成物的种类
反应物, 生成物各物质的质量的比
反应物, 生成物各物质的质量之比
反应条件
什么是元素的质量分数?
