5 Energy Transfers In Reactions

Question 1

During a chemical reaction what does the total amount of energy in the Universe do

Answer 1

Stay the same

Question 2

What does the energy do during a chemical reaction

Answer 2

Transferred to or from the surroundings

Question 3

If a reaction is exothermic what does the energy and temperature do

Answer 3

• Energy is transferred to the surroundings

- temperature of surroundings will increase

Question 4

What are some examples of exothermic reactions

Answer 4

• Combustion
• neutralisation reactions
• some oxidation reactions

Question 5

What happens to the energy and temperature of the surroundings in endothermic reactions

Answer 5

• It absorbs energy from the surroundings

- The temperature of the surroundings will decrease

Question 6

What are some examples of endothermic reactions

Answer 6

• Thermal decomposition reactions

- reactions between citric acid and sodium hydrogen carbonate

Question 7

What are some uses in a Exothermic reactions

Answer 7

Handwarmers and self heating cans

Question 8

What some uses in endothermic reaction

Answer 8

Sports injury pack

Question 9

How do you find the energy change of a reaction in solution

Answer 9

Mixing the reactants in a well insulated polystyrene cup and measuring the change in temperature of the reaction