When calcium (ca) is mixed with hydrochloric acid (hcl), a single replacement reaction occurs. what will be the product or products of the reaction? a. cacl + h2
b. cacl2
c. ca + hcl
d. cacl2 + h2

The correct answer is option d: CaCl2 + H2

Explanation:

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When the Ca + HCl is joined there is a replacement reaction in which Ca takes the place of H and to balance loads, we need two atoms of Cl.

The resulting reaction is CaCl2 + H2

The complete reaction is

Ca + 2HCl ---> CaCl2 + H2

We conclude that the correct answer is option d: CaCl2 + H2

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.