Energy Changes

Question 1

Exothermic Reaction

Answer 1

Release energy into it’s surroundings usually in the form of heat
(Products will be lower than reactants)

Question 2

How could you measure the amount of heat energy released in an Exothermic reaction?

Answer 2

By putting it in a sealed container

Question 3

Common types of Exothermic reactions?

Answer 3

-Combustion reactions= in which fuels are burnt in the presence of oxygen
-Neutralisation reactions= between acid and bases
-Most oxidation reactions=

Question 4

Endothermic Reactions

Answer 4

-Take in heat energy from surroundings
(You’d have to supply heat for reaction to take place)
(Reactants are lower than products as products have more energy)

Question 5

What would we call the difference between the energy of reactants to products in an endothermic reaction?

Answer 5

‘Energy absorbed’

Question 6

What would we call the difference in energy between reactions and products in an Exothermic reaction?

Answer 6

‘Energy released’

Question 7

What is activation energy?

Answer 7

The minimum amount of energy needed for the reactant particle to collide and react

Question 8

The greater the activation energy…

Answer 8

…the more energy required to start the reaction