Energy Changes

Question 1

Reversible reaction that you need to know

Answer 1

Copper sulphate

Question 2

Exothermic

Answer 2

Energy is lost during the reaction and the temp of the surroundings increase

Question 3

Endothermic

Answer 3

Energy is taken in from the surroundings so there is a temperature drop

Question 4

Energy transfer required practical

Answer 4

Put 25 cm of hydrochloric acid and sodium hydroxide in separate beakers.
Place the beakers in the water bath set to 25c until they are both the same temp.
Add the HCl and the NaOH to a polystyrene cup with a lid.
Take the temp every 30 secs and record the highest temp
Record with different concentrations of HCl

Question 5

Bonds and ends exo

Answer 5

Bond breaking is endothermic and bond making is exothermic