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What is an exothermic reaction?
A reaction in which energy is transferred to the surroundings, so the temperature of the surroundings increasesWhat
What is an endothermic reaction?
A reaction in which energy is taken in from the surroundings, so the temperature of the surroundings increases.
What are examples of exothermic reactions?
Combustion, many oxidation reactions, and neutralisation
what are everyday uses of exothermic reactions?
Self heating cans and hand warmers
What are examples of endothermic reactions?
Decompositions and the reaction of citric acid and sodium hydrogencarbonate
What are everyday uses of endothermic reactions?
Some sports injury packs, and ice packs
When do chemical reactions occur?
When reacting particles collide with each other and with sufficient energyWh
What is activation energy?
The minimum amount of energy that particles must have to react
What can reaction profiles be used to show?
The relative energies of reactants and products, the activation energy, and the overall energy change of a reaction
What is an exothermic reaction in terms of bond energies?
Energy released from forming new bonds is greater than energy needed to break existing bonds
What is an endothermic reaction in terms of bond energies?
Energy need to break existing bonds is greater than energy needed to form new bonds
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