a reaction that gives out energy to the surroundings
Endothermic reaction
a reaction that takes in energy from the surroundings
Reversible reaction
a reaction that can go forwards or backwards
Activation energy
the minimum amount of energy required for a reaction to take place
Energy level diagram
reactants and the products of a reaction, the activation energy and the overall energy change of the reaction
Reaction profile
(energy level diagram) a diagram showing the relative energies of the reactants and the products of a reaction, the activation energy and the overall energy change of the reaction
Catalyst
a substance that speeds up the rate of a chemical reaction, but is not used up in the reaction itself
Endothermic
a reaction that takes in energy from the surroundings
Exothermic
a reaction that gives out energy to the surroundings
Cell
contains chemicals that react together to release electricity
Fuel cell
a very efficient way of producing electrical energy in which a fuel is oxidised electrochemically to produce a potential difference or voltage
