Multiple Choice
When a substance burns in a closed system, is there any evidence that atoms are destroyed during the reaction?
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2. Atoms & Elements
Law of Conservation of Mass
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Which of the following best represents the law of conservation of mass?
A
In a chemical reaction, the total mass of the reactants equals the total mass of the products.
B
The mass of a substance increases when it is heated.
C
Energy is created during a chemical reaction.
D
Atoms are destroyed during a chemical reaction.
Verified step by step guidance1
Understand the law of conservation of mass: it states that mass cannot be created or destroyed in a chemical reaction.
Recognize that in any chemical reaction, the total mass of the substances before the reaction (reactants) must be equal to the total mass of the substances after the reaction (products).
Evaluate each given statement to see if it aligns with this principle:
- 'The total mass of the reactants equals the total mass of the products' directly reflects the law of conservation of mass.
- Other statements such as mass increasing when heated, energy creation, or atom destruction contradict this fundamental law.
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