Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The starting and ending temperatures for four separate reactions are measured. Which reaction releases the least heat?

  • Ainitial temperature $19\,^{\circ}\text{C}$, final temperature $25\,^{\circ}\text{C}$
  • Binitial temperature $21\,^{\circ}\text{C}$, final temperature $18\,^{\circ}\text{C}$
  • Cinitial temperature $22\,^{\circ}\text{C}$, final temperature $17\,^{\circ}\text{C}$
  • Dinitial temperature $22\,^{\circ}\text{C}$, final temperature $26\,^{\circ}\text{C}$

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