Heat Changes
Chemistry: Edexcel IGCSE, topic 14.1.4
Combustion of Alcohols
Alcohols combust to release energy. We can measure the amount of energy released by measuring the temperature change in water.
-min,w_800.png)
Measuring variables
- The mass of the alcohol and burner is measured before and after combusting the fuel.
- The temperature of the water can be measured before and after to find the temperature change.
- If we divide the temperature change by the mass of fuel used, we can compare to the mass needed to heat the water up by 1 degree celsius.
Practical considerations
- Heat energy is lost to the surroundings, so we use draft insulators to minimise heat loss.
- Heat energy is used to heat the glass instead of the water.
- Some water can evaporate.
Test yourself on Heat Changes
When measuring energy released by the combustion of alcohols, what can we use to minimise heat loss?