Science 10: Reaction Rate Learning outcomes 20, 21

REACTION RATE: Reaction Rate (AKA Rate of Reaction) How quickly or slowly your reactants turn into products. Eg. From our last lab: High reaction rate Low reaction rate

Factors Affecting Reaction Rate: 1) Temperature: High temperature = Higher rate of reaction Low temperature = Lower rate of reaction How: Kinetic molecular theory: Particles move faster when you heat them up = more collisions

Factors Affecting Reaction Rate: 2)Concentration: Low concentration = low reaction rate High concentration = high reaction rate How: The reactants are more likely to bump into each other Low Concentration High Concentration

Factors Affecting Reaction Rate 3) Surface Area: A lot of surface area available = high reaction rate A low amount of surface area = low reaction rate How: High surface area means there is a large amount of reactants available to react with. Eg. Burning wood: A solid 2kg log burns slowly A 2kg bunch of twigs burns fast

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Factors Affecting the Reaction Rate 4) Catalyst: A catalyst is a substance that speeds up the reaction rate without being used up in the reaction. How? A catalyst will line up molecules so that when they collide they will react. This reduces the amount of energy that is needed in a reaction

Assignment Review Questions: Reaction rates and Reaction types Next class final Chem review Test on Tuesday