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Chemical reactions: acid and metal
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When a metal reacts with acid bubbles may form, it is exothermic and the metal reduces in size (disappears).
Different metals have varying reactivity with acids.
When a metal reacts with an acid, the products are a metal salt and hydrogen gas.
The word equation for a metal and acid reaction is: metal + acid → metal salt + hydrogen.
The test for hydrogen gas is to introduce a lit splint, which will make a squeaky pop in hydrogen.