Multiple Choice
According to the Law of Conservation of Mass, what is always true about the total amount of O_2 and CO_2 in a closed test tube during a chemical reaction?
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2. Atoms & Elements
Law of Conservation of Mass
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Which of the following diagrams best demonstrates the law of conservation of mass?
A
A diagram showing mass disappearing during a chemical reaction.
B
A diagram where the total mass of products is greater than the total mass of reactants.
C
A diagram showing reactants and products with equal total mass before and after a chemical reaction.
D
A diagram where the total mass of reactants is greater than the total mass of products.
Verified step by step guidance1
Understand the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. This means the total mass of reactants must equal the total mass of products.
Analyze each diagram option by comparing the total mass of reactants and products shown in the diagram.
Identify that a diagram showing mass disappearing violates the law of conservation of mass because it implies mass is lost.
Recognize that a diagram where the total mass of products is greater than the total mass of reactants suggests mass is created, which also violates the law.
Conclude that the correct diagram must show reactants and products with equal total mass before and after the reaction, demonstrating the law of conservation of mass.
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