Energy profile diagrams

Exothermic heat is given

out to surroundings

exothermic surroundings get

hotter

exothermic the system

loses energy

exothermic the bonds made contain

less energy than the bonds that were broken

Exothermic the value of energy change is

negative

Diagram shape exothermic

up to down

What is before bump on diagram

reactants A+B

What is the height of bump

Activation energy

What is from starting line down to base line

heat out ( delta H = -ve)

What is on line at bottom

products C

endothermic heat is

taken in from surroundings

endothermic The surroundings get

colder

Endothermic the system

gains energye

Endothermic The bonds made

contain more energy than the bonds that were broken

Endothermic The value of energy change is

Positive