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Learning outcomes
Learning outcomes
Be able to explain how concentration, temperature and surface area affect the rate of reactions.
Be able to explain the effect of catalysts on the rate of reactions.
Factors affecting the rate of a reaction
Factors affecting the rate of a reaction
There are four factors that affect the rate of a reaction. These are:
concentration
temperature
surface area (particle size)
presence of a catalyst.
Concentration
Concentration
Concentration is the amount of a substance in a given volume of liquid or space. In your NCEA Level 1 Science course you will come across concentration of chemicals in either molL-1 or % concentrations. You will also be expected to be able to dilute solutions with water to make less concentrated (or more dilute) solutions.
The video below shows how the reaction rate of magnesium ribbon with acid changes, when you use 2 molL-1 acid instead of 1 molL-1 .
Concentration of acid affecting reaction with magnesium.MOVTemperature
Temperature
The video below shows how increasing the temperature of hydrochloric acid can increase the reaction rate with sodium thiosulfate solution.
Effect of temperature on the reaction between acid and sodium thiosulfate.MOVSurface Area (or Particle Size)
Surface Area (or Particle Size)
The video below shows how increasing the surface area of calcium carbonate by using powdered calcium carbonate instead of small marble chips, can increase the rate of reaction with hydrochloric acid.
Surface area of calcium carbonate and its reaction with acid.MOVCatalysts
Catalysts
The videos below show the effect of catalysts in two different chemical reactions.
Hydrogen peroxide and manganese dioxide catalyst.MOVThe decomposition of hydrogen peroxide using manganese dioxide as a catalyst
Zinc and hydrochloric acid with copper sulfate catalyst.MOVThe reaction of zinc granules with hydrochloric acid with and without a catalyst of copper sulfate solution
Videos
Videos
Test your knowledge & understanding
Test your knowledge & understanding
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