1. Acid reactions

2. Metals and acid reaction Example Magnesium Metal (Mg) reacts with Hydrochloric acid (HCl) to produce Hydrogen Gas and Magnesium Chloride Salt Magnesium + Hydrochloric acid  Hydrogen gas + Magnesium Chloride + Heat General word equation for Metal and Acid reactions Metal + Acid  Salt + Hydrogen Gas

3. The reaction explained HCl is dissolved to make hydrogen ions and chloride ions The hydrogen ions take electrons from the magnesium metal The hydrogen ions then bond to become hydrogen gas The magnesium ions and two chloride ions bond to make magnesium chloride

4. Acid and Metal carbonate reactions We had a flask which contained hydrochloric acid. To this we added calcium carbonate. Word equation Calcium carbonate + Hydrochloric acid  Calcium chloride + Water + Carbon dioxide Metal Carbonate + Acid  Salt + Water + Carbon dioxide

5. The lime water test Lime water is a solution of Calcium hydroxide. When it is mixed with Carbon dioxide it produces water and Calcium carbonate. The calcium carbonate is a white solid which does not dissolve in water. As a result the lime water test makes a milky solution when carbon dioxide is present. Calcium hydroxide + Carbon dioxide  Calcium carbonate + Water