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Observations That Help Determine Chemical Change

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Question

what is the relationship between hydrochloric acid and zinc?

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Solution

There is no relationship between hydrochloric acid and zinc. The former is acid and later is a metal.
If they are made to react they will give zinc chloride and hydrogen gas as products. The reaction is as follows:
Zn + 2HCl $\to$ ZnCl₂ + H₂
The reaction happens so because Zn being more reactive than hydrogen, displaces it from HCl and give the corresponding products.

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Observations That Help Determine Chemical Change

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