Multiple Choice
According to the Law of Conservation of Mass, what would happen to the total mass if a chemical reaction occurs inside a sealed plastic bag?
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2. Atoms & Elements
Law of Conservation of Mass
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?
A
The combined mass of O_2 and CO_2 remains constant throughout the reaction.
B
The mass of CO_2 is always greater than the mass of O_2.
C
The total mass of O_2 and CO_2 increases as the reaction proceeds.
D
The mass of O_2 always decreases while the mass of CO_2 increases.
Verified step by step guidance1
Recall the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a closed system during a chemical reaction.
Identify that in a closed test tube, no substances can enter or leave, so the total mass of all substances inside remains constant.
Recognize that O_2 and CO_2 are two substances involved in the reaction, and their combined mass must remain the same throughout the reaction.
Understand that while the individual masses of O_2 and CO_2 may change (O_2 might decrease as it reacts, CO_2 might increase as it forms), their total combined mass does not change.
Conclude that the correct statement is: the combined mass of O_2 and CO_2 remains constant throughout the reaction, consistent with the Law of Conservation of Mass.
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