In the chemical equation zn + 2hcl → zncl2 + h2, the reactants are

a. zinc chloride and hydrogen.

b. zinc and hydrogen carbonate.

c. zinc chlorate and water.

d. zinc and hydrochloric acid.

D. zinc and hydrochloric acid.

Explanation:

Step 1: The balanced equation:

Zn + 2HCL → ZnCl2 + H2

Step 2:

All chemical reactions involve both reactants and products. Reactants are substances that start a chemical reaction, and products are substances that are produced in the reaction.

This means the substances on the left side, Zinc (Zn)  and hydrochloric acid (HCl) are the reactants and will react with eachother, to form the products Zinc chloride (ZnCl2) and hydrogen gas (H2).

Option A: is not correct because zinc chloride and hydrogen are the products

Option B: is not correct because there is no hydrogen carbonate in the reaction

Option C: is not correct because there is no zinc chlorate, neither water in the reaction

The correct answer is D. zinc and hydrochloric acid.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.