Multiple Choice
According to the law of conservation of mass, which of the following must be the same before and after a chemical reaction?
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2. Atoms & Elements
Law of Conservation of Mass
Multiple Choice
Which of the following is true regarding the law of conservation of mass?
A
The law of conservation of mass applies only to physical changes, not chemical reactions.
B
Mass can be created or destroyed during a chemical reaction.
C
The total mass of reactants equals the total mass of products in a chemical reaction.
D
The mass of products is always greater than the mass of reactants.
Verified step by step guidance1
Understand that the law of conservation of mass states that mass cannot be created or destroyed in a closed system during any process, including chemical reactions.
Recognize that this law applies universally to both physical changes (like phase changes) and chemical reactions, meaning the total mass before and after the change remains constant.
Evaluate each statement given in the problem: the first statement is incorrect because the law applies to both physical and chemical changes, not just physical changes.
The second statement is incorrect because mass cannot be created or destroyed during a chemical reaction; it is conserved.
The third statement is correct because it directly reflects the law of conservation of mass: the total mass of reactants equals the total mass of products in a chemical reaction.
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