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3.1 Chemical Measurements
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卡片总数: 4 张•内容版本: v4•公开卡包•更新时间: 8/1/2026
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#1
正面 (问题)
What is the law of conservation of mass?
背面 (解答)
No atoms are lost or made during a chemical reaction Mass of products = Mass of reactants (number of atoms of each element on both sides must be the exact same)
#2
正面 (问题)
What is relative formula mass?
背面 (解答)
Sum of relative atomic masses of atoms shown in the formula e.g. HCl Mr= 1 +35.5 =36.5
#3
正面 (问题)
What happens to Mr in a balanced chemical equation?
背面 (解答)
No change to MR, sum of reactants is equal to products
#4
正面 (问题)
What can cause a change in mass after a reaction?
背面 (解答)
Reactant or a product such as a gas bot being accounted for e.g. gas released into atmosphere