question: chemical X has a mass if 5 grams, and chemical Y has a mass of 10 grams if the two chemicals are mixed and complete chemical reaction takes places, what is most likely the mass of the product?

The answer is C, 15 grams

Explanation:

The conservation of mass means matter can not be created or destroyed. When a chemical reaction takes place, chemicals can recombine but all the matter (mass) still exists. So, the mass of the reactants (X and Y) must equal the mass of the product.

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