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Rates of Reaction
Chemical reactions occur when
different atoms or molecules collide:
For the reaction to happen the particles must have a
certain amount of energy ­ this is called the
The rate at which the reaction happens depends on four things:
1) The temperature of the reactants,
2) Their concentration
3) Their surface area
4) Whether or not a catalyst is used…read more

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Measuring rate of reaction
Two common ways:
1) Measure how fast the
products are formed
2) Measure how fast the
reactants are used up…read more

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Rate of reaction graph
Amount of Slower rate of reaction here
product due to reactants being used up
Fast rate
of reaction Slower reaction
Time…read more

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Endothermic and exothermic reactions
Step 1: Energy must be
SUPPLIED to break bonds:
Step 2: Energy is RELEASED
when new bonds are made:
A reaction is EXOTHERMIC if more energy is RELEASED
then SUPPLIED. If more energy is SUPPLIED then is
RELEASED then the reaction is ENDOTHERMIC…read more

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Exothermic vs endothermic:
energy is given out than is energy is taken in but
taken in (e.g. burning, not necessarily given out
respiration) (e.g. photosynthesis)…read more

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