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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