What is a balanced chemical equation ? Why should chemical equations be balanced?

Write the balanced chemical equation for the reaction between lead metal and copper chloride solution. What type of reaction is this?

Write the balanced chemical equations for the following reactions : Manganese tetrachloride + Water rarr Manganese dioxide + Hydrochloric acid

Write the balanced chemical equations for the following reactions. Calcium hydroxide + Carbon dioxide rarr Calcium carbonate + Water

Write the balanced chemical equations for the following reactions : Calcium carbonate + Hydrochloric acid rarr Calcium chloride + Water + Carbon dioxide

Write the balanced chemical equations for the following reactions : Methane + Oxygen rarr Carbon dioxide + Water

Write the balance chemical equations (xiv) BF_3 + LiH rarr

Write the balanced chemical equations for the following reactions : Barium chloride + Sulphuric acid rarr Barium sulphate + Hydrochloric acid