Question

which statement describes the law of conservation of mass? 10 points a. atoms can be destroyed in a chemical reaction b. the total number of atoms increases after a reaction c. matter cannot be created or destroyed d. mass is only conserved in physical changes which part of a chemical equation shows the substances present before the reaction? 10 points a. coefficients b. products c. arrow d. reactants what must be true for a chemical equation to be balanced? * 10 points a. it uses the same number of symbols on both sides b. the number of atoms of each element is equal on both sides c. the products have more atoms than the reactants d. it contains only one product

Explanation:

1. The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction. Atoms are conserved, not created or destroyed.
2. In a chemical equation, reactants are the substances present before the reaction occurs. Products are the substances formed after the reaction.
3. A chemical equation is balanced when the number of atoms of each element is equal on both the reactant and product sides. This upholds the Law of Conservation of Mass.

Answer:

1. C. Matter cannot be created or destroyed
2. D. Reactants
3. B. The number of atoms of each element is equal on both sides