5 of 20 09
A chemist places zinc metal and hydrochloric acid in a test tube. She observes that the test tube feels warm as hydrogen gas and aqueous zinc chloride
are produced. The reaction follows the unbalanced equation given below.
Zn(s) + HCl(aq) - H20) + ZnCl2(aq) + heat
How do you know whether this is a chemical ct ge or a ysical change?
B
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T
T:
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