Question

You are given the following materials:

1) Marble chips
2) Dilute Hydrochloric acid
3) Zinc granules
Identify the type of reaction when marble chips and Zinc granules are added separately to acid taken in two tubes. Write chemical equations in each case.

Answer 1

Marble chips react with dilute HCl to form calcium chloride, water, and carbon dioxide gas. Zinc granules react with HCl in a single-displacement reaction to produce zinc chloride and hydrogen gas.

Step-by-step explanation:

When marble chips, which are composed of calcium carbonate (CaCO3), are added to dilute hydrochloric acid (HCl), a chemical reaction occurs producing calcium chloride (CaCl2), water (H2O), and carbon dioxide (CO2) gas. This reaction is represented by the balanced chemical equation:

CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

Separately, when Zinc granules are added to hydrochloric acid, zinc reacts with the acid to form zinc chloride (ZnCl2) and hydrogen gas (H2). This is a single-displacement reaction, and the chemical equation for this reaction is:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

In both scenarios, gas production is evidence that a chemical reaction has taken place.