Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Heat energy transfer in chemical reactions may be represented by energy level diagrams. In which row is the description correct?

  • A1 and 2
  • B1 and 3 only
  • C1, 3 and 4
  • D2 and 4

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