Question

conservation quick check
if the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be _. (1 point)
0 grams
28 grams
32 grams
30 grams

Explanation:

According to the law of conservation of mass, in a chemical reaction, the total mass of reactants equals the total mass of products. So if the mass of elements before reaction is 30 grams, it will remain 30 grams after the reaction.

Answer:

30 grams