Topic 5 (Energy Changes)

Question 1

What is an exothermic reaction

Answer 1

An exothermic reaction is one which transfers energy to the surroundings, usually by heating. This is shown by a rise in temperature

Question 2

What are 3 examples of exothermic reactions

Answer 2

•Combustion
•Neutralisation
•Oxidation Reactions

Question 3

What is an endothermic reaction

Answer 3

An endothermic reaction is one which takes in energy from the surroundings. This is shown by a fall in temperature

Question 4

What is an example of endothermic reaction

Answer 4

Thermal decomposition

Question 5

What is bond breaking

Answer 5

Endothermic as energy is taken in to break the bonds

Question 6

What is bond forming

Answer 6

Exothermic as energy is released when bonds are formed

Question 7

If the energy of the reactants is higher than the energy of the products is the reaction endothermic or exothermic

Answer 7

Exothermic

Question 8

If the energy of the reactants is lower than the energy of the products is the reaction endothermic or exothermic

Answer 8

Endothermic

Question 9

What is a cell

Answer 9

An electrochemical cell is a basic system made up of two different electrodes in contact with an electrolyte.

Question 10

What is a fuel cell

Answer 10

A fuel cell is an electrical cell that’s supplied with fuel and oxygen and uses energy from the reaction between them to produce electrical energy