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Electric city

energy chemical reactions

when chemicals bonds are made energy releasd.thisstage of reaction is exothermic.

enthalpy will be positive

The reactants heat up during the reaction Heat goes in

when chemicals bonds are broken energy is needed no break the bonds.This stage of reation is endothermic.

enthalpy will be negative

The reactants cooldown during the reaction Heat goes out

This energy can be forms of

Heat

light

during chemical reactions olds bonds are made

-can be taken in from the surrounding

-canbe given out from surrounding

enrrgy can be given out to surrounding

energy can be taken in from surrounding

Rate of reactions

Factors that affect chemical reactions.

Pressure

Temperature

surface area

concentration of substance

Nature of substance

Rate of reation is the speed at which a reaction happends

Example

bread dough rise more quickly in a worm place than in a cool one

Low body temperatures slow down metabolismงin fact.warm-blooded animals regulate body temperature so that their biochemical reactions run at the correct rate.

cookies bake faster at higher temperature

chemical reactions movies

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