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Which of the following is an indication of a chemical reaction?
Ofreezing
O melting
O release of heat
O all of the above

Sagot :

Answer:

• Release of heat.

Explanation:

• In exothermic chemical reactions, heat is released due to multiple collisions of the reactant molecules.

→ Freezing and melting are physical changes.

• Other physical changes are;

  • sublimation
  • condensation
  • evaporation

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