Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Four different fuels are used, each for the same length of time, to heat a beaker of water with the apparatus shown. The water’s starting temperature and its temperature after heating with each fuel are measured. Which fuel gives out the greatest amount of heat energy?

  • Ainitial temperature $17\,^{\circ}\text{C}$, temperature after heating $46\,^{\circ}\text{C}$
  • Binitial temperature $24\,^{\circ}\text{C}$, temperature after heating $52\,^{\circ}\text{C}$
  • Cinitial temperature $26\,^{\circ}\text{C}$, temperature after heating $61\,^{\circ}\text{C}$
  • Dinitial temperature $30\,^{\circ}\text{C}$, temperature after heating $62\,^{\circ}\text{C}$

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