GCSE Combined Science (AQA)

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Catalysts & Rate

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The rate and extent of chemical change Rate of reaction

Catalysts & Rate

5:38 Effects of Catalysts on the Rate of Reaction
Spec 4.6.1.2 4.6.1.4
Previous Temperature & Rate Next Concentration, Pressure & Rate
  • Chemical reactions can be accelerated using catalysts.
  • Reaction rates can be plotted on graphs with time on the X-axis and product amount on the Y-axis.
  • A catalyst increases the reaction rate, as shown by a steeper line on a graph.
  • Catalysts are not consumed in a reaction.
  • Example: Manganese (IV) oxide speeds up the breakdown of hydrogen peroxide without being used up.
  • Catalysts do not alter the products of a reaction.
  • Catalysts increase reaction rates without appearing in the reaction equation.
  • Different reactions require different catalysts.
  • Platinum or palladium are used in catalytic converters in cars to convert harmful gases to cleaner exhaust gases.
  • Nickel is used as a catalyst in margarine production to speed up the reaction of vegetable oils with hydrogen.
  • Enzymes act as catalysts in biological systems, allowing reactions to occur at lower temperatures.
  • Example: Amylase in saliva helps break down starch into sugars for energy.
  • Enzymes are catalysts for biological reactions.

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