exothermic and endothermic reactions

Description

GCSE Chemistry (unit 3) Slide Set on exothermic and endothermic reactions, created by janey.efen on 13/02/2016.
janey.efen
Slide Set by janey.efen, updated more than 1 year ago
janey.efen
Created by janey.efen almost 9 years ago
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Resource summary

Slide 1

Slide 2

    background
    during a chemical reaction, old bonds are broken and new bonds are formedenergy must be supplied to break existing bonds - so the bond breaking is an endothermic processenergy is released when new bonds are formed - so bond formation is an exothermic process

Slide 3

    exothermic
    what is an exothermic reaction?an exothermic reaction is one which gives out energy to the surroundings, usually in the form of heatwhat happens in an exothermic reaction?the energy released in bond formations greater than the energy used in breaking the old bonds

Slide 4

    endothermic
    what is an endothermic reaction?an endothermic reaction is one which takes in energy from the surroundings, usually in the form of heat and usually shown by a fall in temperaturewhat happens in an endothermic reaction?the energy required to break old bonds ins greater than the energy released when new bonds are formed
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