Which of the following best describes a chemical equation that demonstrates the law of conservation of matter? A. It has five total atoms on each side. B. It has three atoms of hydrogen on each side. C. It has two compounds on each side. D. It has four molecules on each side.

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B, since it is the only one that actually conserves matter for certain. In each of the others, matter could still be imbalanced, since for A, for example, it could be 5 Carbons on the right and 5 Chlorines on the left, and that would not balance.

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