Chem: exothermic and endothermic reaction

IGCSE

define exothermic reactions

reaction that transfers thermal energy to the environment

Define endothermic reactions

this is a reactions that takes in heat from its surrounding

Draw the energy level diagram for exothermic reactions

Draw the energy level diagram for endothermic reactions

Exothermic reactions…..?

bond making

Endothermic reactions……?

Bond breaking

Define enthalpy change

the amount of energy taken in and given out in a reaction.

Wht is the enthalpy change in exothermic reaction?

negative

wht is the enthalpy change in endothermic reaction?

positive

Define activation energy

The minimum amount of energy needed for a reaction to start

Define bond energy

the amount of energy needed to break 1 mole of a bond