Chemistry - Energy Changes

What type of reaction transfers energy and increases the temperature of the surroundings?

Exothermic

What type of reaction absorbs energy from the surroundings, therefore decreasing the temperature?

Endothermic

Give 3 examples of a reaction that transfers energy into the surroundings and name it.

Exothermic reactions include combustion, many oxidation reactions, and neutralisation.

Give 2 examples of a reaction that absorbs energy from the surroundings and name it.

Endothermic reactions include: thermal decomposition and the reaction between citric acid and sodium hydrogencarbonate.

Give 2 everyday examples of an exothermic reaction.

Self-heating cans, hand warmers

Give an everyday example of an endothermic reaction.

Ice packs for sports injuries

What can only occur when reacting particles collide with each other and with sufficient energy?

Chemical reactions

What is the minumum amount of energy that particles must have to react?

Activation energy

What can be used to show the relative energies of reactants, products, activation energy and an energy change?

Reaction profiles

What type of reaction releases heat to the surroundings, therefore the products have less energy than the reactants?

Exothermic reaction

What type of reaction takes in heat from the surroundings, therefore the products have more energy than the reactants?

Endothermic reaction

What must be supplied to break bonds in a reaction?

Energy

What must be released to form bonds in a reaction?

Energy

If more energy is taken in to break bonds than energy released to make bonds, what type of reaction is it?

Endothermic

If more energy is released when bonds are formed than energy taken to break bonds, what type of reaction is it?

Exothermic