Question

In the chemical reaction below, calcium (Ca) and water (H2O) react to form calcium hydroxide (Ca(OH)2) and hydrogen gas (H2).
Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g)

Calcium and water are the reactants in this chemical reaction, whereas calcium hydroxide and hydrogen gas are the products that are formed. Once the reaction reaches completion,
A.
the total mass of the products will be greater than the original mass of the reactants.
B.
the total mass of the products will be less than the original mass of the reactants.
C.
the products of the reaction will have changed back into the reactants.
D.
the total mass of the products will be equal to the original mass of the reactants.
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Answer 1

Answer;

D. the total mass of the products will be equal to the original mass of the reactants

Explanation;

• According to the law of conservation of mass, matter cannot be created or destroyed. Every chemical equation obeys this Law.
• Law of conservation of mass is adhered in all chemical equations by ensuring the chemical equation is balanced. This involves the use of coefficients on products and reactants to balance the number of atoms of an element on both sides of a chemical equation.
• Therefore, according to the Law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants, which is achieved by balancing the chemical equation.

Answer 2

Answer:

it is the answer d. the total mass of the products will be equal to the original mass of the reactants

Explanation: