A student investigates the temperature rise of water in a copper can placed above a spirit burner containing a flammable liquid.
State whether each of the changes listed in the table would increase, decrease, or have no effect on the value of the maximum temperature of the water.
| Change | Effect on the value of the maximum temperature of the water |
|---|---|
| Carrying out the experiment in a draughty room | |
| Using a thermometer with divisions at 0.1∘C0.1^\circ\text{C}0.1∘C instead of 0.5∘C0.5^\circ\text{C}0.5∘C | |
| Putting a lid on top of the copper can |
In one experiment, ethanol was used as the flammable liquid. The calculated heat energy change was 39900 J.
In this experiment, the mass of ethanol burned was 1.38 g.
The relative molecular mass of ethanol is 46.
Use this information to calculate the molar enthalpy change of combustion, in kJ/mol\text{kJ/mol}kJ/mol, of ethanol.
35 exam-style questions on Edexcel IGCSE Chemistry Energetics. Each one has a worked solution and a mark scheme showing where the marks go.