Energetics

Question 1

Exothermic

Answer 1

Chemical reaction in which heat energy is given out to the surroundings
Eg. Combustion, displacement, neutralisation

Question 2

Endothermic

Answer 2

Chemical reaction in which heat energy is taken from the surroundings
Eg. Thermal decomposition

Question 3

Delta H in exothermic reactions

Answer 3

Always negative

Question 4

Delta H in endothermic reactions

Answer 4

Always positive

Question 5

Enthalpy change

Answer 5

Overall change of energy in a reaction

Question 6

Activation energy

Answer 6

Energy needed to start a reaction, the minimum amount the reactants need to collide and react

Question 7

Heat energy equation

Answer 7

Q = mc change in temp

Question 8

Bond breaking

Answer 8

Endothermic, energy is put in

Question 9

Bonds forming

Answer 9

Exothermic, energy is released