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GCSE AQA chemistry- Energy changes
Terms in this set (10)
What is an exothermic reaction?
A reaction that causes a rise in temperature to surroundings- it releases energy
What is an endothermic reaction?
A reaction that causes a decrease in temperature in the surroundings-it takes in energy
What happens in a chemical reaction?
Atoms are rearranged as old bonds are broken and new bonds are formed
What is the activation energy?
The minimum amount of energy that particles must have to take place
What is the energy level diagram (reaction profile) for an exothermic reaction?
What is the energy level diagram (reaction profile) for an endothermic reaction?
Is breaking a bond in a chemical reaction an endothermic or exothermic process?
Endothermic (takes in energy)
Is forming a bond in a chemical reaction an endothermic or exothermic process?
Exothermic (releases energy)
What determines if a reaction is exothermic?
If the energy released when bonds are formed is greater than the energy needed to break bonds
What determines if a reaction is endothermic?
If the energy needed to break bonds is more than the energy released as bonds formed
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