Metals in hot and cold acid

• The general equation for metals in hot and cold acid: $Metal\ \ +$$\ Acid\ \rightarrow\ Salt\ +$$\ Hydrogen$
• Magnesium + Sulphuric Acid -> Magnesium Sulphate + Hydrogen
• Sodium + Citric Acid -> Sodium Citrate + Hydrogen
• Zinc + Hydrochloric Acid -> Zinc Chloride + Hydrogen
• Lead + Nitric Acid -> Lead Nitrate + Hydrogen
• Why do metals react at a faster rate with hot acid?

  Due to increased kinetic energy of the reaction particles.