Electric city
chemical reactions movies
Subtopic
example for chemical reaction
Subtopic
Rate of reactions
Rate of reation is the speed at which a reaction happends
Example
cookies bake faster at higher temperature
Low body temperatures slow down metabolismงin fact.warm-blooded animals regulate body temperature so that their biochemical reactions run at the correct rate.
bread dough rise more quickly in a worm place than in a cool one
Factors that affect chemical reactions.
Nature of substance
concentration of substance
surface area
Temperature
Pressure
energy chemical reactions
during chemical reactions olds bonds are made
energy can be taken in from surrounding
enrrgy can be given out to surrounding
This energy can be forms of
Heat
light
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
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