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It depends what acid or metal it is but usually they either give of a gas, increase temperature or give off effervescence.
http://wiki.answers.com/Q/What_happens_if_an_acid_...
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hfwehjuefh.
http://wiki.answers.com/Q/What_happens_when_acid_r...
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the colour may change but there is no gas??
http://wiki.answers.com/Q/What_happens_when_metal_...
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the acid eats the meatl.
http://wiki.answers.com/Q/What_happens_when_a_meta...
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