Reaction between a metal and an acid
This occurs when dilute acids react with metals to form a gas called hydrogen
An example is when magnesium and hydrochloric acid react together and magnesium chloride and hydrogen is formed.
Another example is sulfiric acid and calcium will combine to calcium sulfate and hydrogen gas.
This is an exothermic reaction as heat is given out.
Reaction between an acid and a metal carbonate
This occurs when a metal carbonate and an acid form a gas called carbon dioxide.
An example is when hydrochloric acid is mixed with calcium carbonate, it will form calcium chloride, carbon dioxide and water.
This is also an exothermic reaction as heat is given off.
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