Question

. FILL IN THE BLANKS

1. During a chemical reaction, the sum of the _________ of the reactants and

products remain unchanged.

2. In a pure chemical compound, elements are always present in a ________

proportion by mass.
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Answer 1

Answer:

1. In a chemical reaction, the sum of the masses of the reactants and productsremains unchanged. This is called law of conservation of mass.
2. Law of Definite Proportions

Answer 2

Answer:

1. Masses

2. Definite

Explanation:

1.In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called law of conservation of mass

2.In a pure chemical compound, elements are always present in a definite proportion by mass.