Energy transfer in reactions

exothermic A reaction that gives energy out, usually in the form of heat. Usually shown by a rise in temperature E.g. burning fuels, neutralisation, adding water to anhydrous copper sulphate

A reaction that gives energy out, usually in the form of heat. Usually shown by a rise in temperature

E.g. burning fuels, neutralisation, adding water to anhydrous copper sulphate

endothermic A reaction that takes in energy from the surroundings. Usually shown by a fall in temperature E.g photosynthesis, ammonium nitrate and water, decomposition of calcium carbonate or malachite (copper carbonate)

A reaction that takes in energy from the surroundings. Usually shown by a fall in temperature

E.g photosynthesis, ammonium nitrate and water, decomposition of calcium carbonate or malachite (copper carbonate)

Rearrangement of atoms (HT) In a reaction, reactants are turned into products In order to do this, the atoms of the reactants must be pulled apart by breaking the bonds between them. Bonds between the atoms of the new products must then be made

In a reaction, reactants are turned into products

In order to do this, the atoms of the reactants must be pulled apart by breaking the bonds between them.

Bonds between the atoms of the new products must then be made

(HT) reactants atoms products Carbon And oxygen Carbon dioxide Bonds made Bonds broken

Breaking and making (HT) Energy is needed to break bonds And is released when bonds are made Breaking bonds is endothermic Making bonds is exothermic

Energy is needed to break bonds

And is released when bonds are made

Breaking bonds is endothermic

Making bonds is exothermic

Energy changes (HT) In an exothermic reaction, more energy is released by making bonds in the products than by breaking bonds in the reactants In an endothermic reaction, more energy is needed to break bonds in the reactants than is released by making bonds in the products

In an exothermic reaction, more energy is released by making bonds in the products than by breaking bonds in the reactants

In an endothermic reaction, more energy is needed to break bonds in the reactants than is released by making bonds in the products