The substance that causes the production of bubbles in the reaction of zinc with sulfuric acid is hydrogen gas.
The reaction of zinc with sulfuric acid can be written as follows:
Zn (s) + H2SO4 (aq) ----------> ZnSO4 (aq) + H2 (g)
From the reaction above, we can see that the reaction between solid zinc and aqueous sulfuric acid produces hydrogen gas (H2) as one of the products. This hydrogen gas appears in the reaction as bubbles that occur significantly and vigorously as the reaction is going on.
Note: other than s, aq, and g, another state of matter in a reaction is l (liquid).
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