How can the rate of reaction be increased in a reaction without using a catalyst?

Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.

Burning of crackers during festivals.

Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.

Copper vessel kept in open air for long time.

Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.

Silver ornaments become black on exposure to air for a long time.