Multiple choice general knowledge science & technology

Heat is liberated in

  1. all chemical reactions

  2. substitution reaction

  3. exothermic reaction

  4. endothermic reaction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Exothermic reactions release heat energy into the surroundings - think "exit" for heat leaving the system. Endothermic reactions absorb heat. Heat is not liberated in all chemical reactions (some are endothermic), and substitution specifically refers to a reaction mechanism, not whether heat is released.

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