Thursday, 16 May 2013

4.17 describe experiments to investigate the effects of changes in surface area of a solid, concentration of solutions, temperature and the use of a catalyst on the rate of a reaction

Surface area

  • Put a set mass of magnesium in hydrochloric acid
  • Time the reaction
  • Change the from of magnesium keeping the mass the same (powder, wire, strips)
  • The more surface area (the smaller the pieces of magnesium) the faster the reaction


  • Put a set mass of marble chips into dilute hydrochloric acid
  • Time the reaction
  • Change the ratio of water to hydrochloric acid
  • The more concentrated the hydrochloric acid (the lower the ratio of water) the faster the reaction


  • Put a set mass of magnesium powder into a set mass of hydrochloric acid
  • time the reaction
  • Carry out this reaction at different temperatures
  • The higher the temperature the faster the rate of reaction


  • If you have hydrogen peroxide it will not decompose
  • If you put it with manganese dioxide it will decompose into water and oxygen
  • The manganese dioxide will be unaltered by the reaction
  • The more of the catalyst the faster the reaction


  1. could use pressure in this because it will increase reaction speed

    great blog though!!

  2. manganese(IV) oxide is the catalyst.

  3. this is the same as manganese dioxide

  4. For the catalsyt test you could also perform the experiment without the catalyst as a control and then repeat the experiment with the same variables as before except with the addition of a catalyst and time how long it takes for the reaction to occur in both circumstances

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  6. then weigh the mass before and after and if the catalyst took place in the reaction the mass will stay the same but if the catalyst effected the reaction then the mass would be different