Topic4 物质的组成-Revision

Multiple Choice

同种元素组成的物质一定是单质

• True

• False

Multiple Select

Which of the following substances are composed of molecules?下列哪些物质是由分子组成的？

• Water水

• Carbon dioxide二氧化碳

• Benzene苯

• Iron铁

Multiple Select

Which of the following substances are composed of atoms?下列那物质是由原子组成的？

• Oxygen氧气

• Iron铁

• Diamond金刚石

• Table salt食盐

Multiple Select

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

Multiple Choice

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

Multiple Choice

高锰酸钾KMnO₄中，锰元素的化合价是

• +5

• +7

Multiple Choice

氯酸钾KClO₃中，氯元素的化合价是

• +5

• +7

Multiple Choice

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。

Multiple Choice

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

Multiple Choice

Which of the following descriptions about the amount of substance is incorrect?下列关于物质的量描述错误的是？

• Represents the amount of particles

• The unit is mole

• The symbol is mol

• The value is less than or equal to $$6.02\times10^{23}$$

Multiple Choice

Which of the following descriptions about molar mass is incorrect?下列关于摩尔质量描述错误的是？

• 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

Multiple Choice

Which of the following descriptions about molar mass is incorrect?下列关于摩尔质量描述错误的是？

• 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

Multiple Choice

Given the mass of a substance, please write the formula for calculating the amount of substance.已知物质的质量，求物质的量的公式是：

• 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)

Multiple Choice

The ratio of the amount of substances between substances represented by a chemical equation is化学反应方程式表示物质的数量之间的关系

• True

• False

Multiple Choice

Which of the following must change before and after a chemical reaction?反应前后一定变化的是？

• Number of atoms

• Number of molecules

• Type of substance

• Total amount of substance in the reactants and products

Multiple Select

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

Open Ended

什么是元素的质量分数?