C2 Rates of Reaction

Revison for Rates of Reaction - Chemistry.

Answer in bullet points. Makes it easier for yourself and the examiner.

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1. TEMPERATURE

Increasing the temperature, makes the rate of reaction faster.

  • energy is increased, faster moving particles
  • more frequent collisions
  • more energy in each collision
  • more succesful collisions
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2. CONCENTRATION (liquids) and PRESSURE (gases)

Increasing the concentration/pressure, makes the rate of reaction faster.

  • more reascting particles
  • more frequent collisions
  • more successful collisions
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3. SURFACE AREA

Increasing the surface area, makes the rate of reaction faster.

How = grind reactants up into smaller pieces

  • more reacting particles exposed
  • more freuent collisions
  • more successful collisions
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4. ADD A CATALYST

Adding a catalyst, makes the rate of reaction faster.

Catalysts are not used up in chemical reactions

  • the catalyst lowers the activation energy (energy required for reaction to take place)
  • more successful collisions
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MEASURING RATES

1. Producing gases - for example

  • measure the volume produced every 30 seconds
  • measure the mass every minute

For 2 marks, name what you're measuring and the time 

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