exothermic and endothermic reactions

Exothermic and endothermic reactions

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Caption: : exothermic

Caption: : endothermic

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

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

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