CHEMICAL REACTIONS
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15 Terms
Reactants
A substance that takes part in and undergoes changes during a reaction (what’s at the start of a reaction)
Products
A substance formed at the end of a reaction
Factors affecting rate of reaction (4)
Particle Size – Concentration – Catalysts – Temperature
Particle Size
Increases the surface area of the reactants
The smaller the particles
The larger the surface area for collisions
Concentration
Increases the concentration of reactants
More reactants
More collisions
Catalysts
Something that speeds up a reaction by lowering its activation energy
Activation energy
The minimum amount of energy needed for a reaction to occur
Different reactions have
Different energies
Ex. (catalyst)
Enzymes in your body that help speed up chemical reactions e.g. digestion
Temperature
Increases the temperature
More heat energy
More energy for collisions
Exothermic
Gives off heat during the reaction
Endothermic
Takes in heat during the reaction