More collisions increase the rate of reaction, what can effect it
Temperature, higher concentration and larger surface area
Higher temperature increases collisions
When the temperature is increased the particles move quicker and collide more often
Higher concentration increases collisions
If a solution is more concentrated it means there are more particles of reactant moving about between the water molecules
Larger surface area increases collisions
If one of the reactants is a solid then breaking it up into smaller pieces will increase the surface area
The minimum amount of energy needed by the particles to react
Using catalysts to speed up reactions will...
Save money and reduce energy
They can be expensive to buy and can be easily poisined by impurities
What happens in an exothermic reaction?
Heat is given out
What is an exothermic reaction?
One which transfers energy to its surroundings usually in the form of heat, shown by a rise in temperature
What is an example of an exothermic reaction?
Burning fuels, combustion
What can use this?
Some hand warmers use the exothermic oxidation of iron in the air to generate heat
What happens in an endothermic reaction?
Heat is taken in
What is an endothermic reaction?
One which takes in energy from its surroundings, usually in the form of heat, shown by a fall in temperature
What is an example of an endothermic reaction?
These are much less common, thermal decomposition
What happens in this?
Heat must be supplied to make calcium carbonate decompose to make quicklime
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