Question

In a test tube, hydrochloric acid is poured over a few zinc granules. List 2 observations that suggest that a chemical reaction has occurred.

Answer 1

if zinc is more reactive than hydrochloric acid then zinc chloride will be formed and colour of HCl change

Answer 2

When we pour HCL into a test tube with Zn granules this reaction happens:

Zn + 2HCl ---》 ZnCl2 + H2 gas

1. We find bubbles of H2 coming out.
As a confirmation if we put a flame near the test tube we hear a pop sound.

2. This reactiin is slightly exothermic. Touching the testube we can fell warmth.

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