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Rates of reaction and energy changes

Edexcel GCSE ChemistryTopic 7 of 916 lessons

Revision notes for Rates of reaction and energy changes in Edexcel Chemistry (1CH0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. Core practical: investigating rates of reactionIn this core practical you change one condition of a reaction and measure how fast it goes.
  2. Practical methods for measuring rateThe rate of a reaction is how fast reactants are used up or products are made.
  3. Collision theory and rate of reactionChemical reactions happen when particles collide with each other.
  4. Factors that change the rate of reactionFour things change the rate of a reaction, and each one works by changing the frequency of collisions, the energy of collisions, or both.
  5. Interpreting rate graphsThe progress of a reaction is often plotted as a graph of the mass or volume of a product against time.
  6. CatalystsA catalyst is a substance that speeds up the rate of a reaction without altering the products of the reaction.
  7. How a catalyst changes the rate in terms of activation energyFor a reaction to happen, colliding particles must have at least a minimum amount of energy.
  8. Enzymes as biological catalysts and alcoholic drinksEnzymes are biological catalysts.
  9. Heat energy changes in everyday reactionsChemical changes and some physical changes are accompanied by changes in heat energy.
  10. Exothermic changes and reactionsAn exothermic change or reaction is one in which heat energy is given out to the surroundings.
  11. Endothermic changes and reactionsAn endothermic change or reaction is one in which heat energy is taken in from the surroundings.
  12. Bond breaking and bond makingIn a chemical reaction, the bonds in the reactants must be broken and new bonds must be made to form the products.
  13. Overall energy change: exothermic or endothermicEvery chemical reaction involves breaking bonds in the reactants and making new bonds in the products.
  14. Calculating energy changes from bond energiesA bond energy is the energy needed to break one mole of a particular bond.
  15. Activation energyReactions happen when particles collide, but most collisions do not lead to a reaction.
  16. Reaction profilesA reaction profile shows how the energy of the chemicals changes during a reaction.

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