energetics

Question 1

How do you investigate the enthalpy change of dissolving, displacement, or neutralisation reactions?

Answer 1

• mix the reactants in a polystyrene cup

- take temp of reactants, mix and take temp at the end

Question 2

Describe a combustion reaction,

Answer 2

• put 50g of water in the copper and record its temp
• weigh the spirit burner and lid
• place spirit burner under the can and light the wick
• heat the water, srirring constantly until temp reaches 50
• put out flame and measure final temp of water
• weigh again and use measurements to calculate enthalpy change