Average rates of reaction

• The rate of a reaction is a measure of how quickly a reactant is used up, or a product is formed.
• Rate of reaction = amount of reactant used/time taken
• Rate of reaction = amount of product formed/time taken
• Quantity is measured in Grams (g) or Centimetres cubed (cm3) and time in seconds (s)
• Mass of reactant start to fall quite rapidly but then it would slow as the reaction progresses and it gets used up less quickly.

  
• At the beginning of the reaction there are no products so it starts at 0. However it quickly increases as lots of product is being produced at the beginning of the reaction. Then as the reaction progresses the graph becomes less steep and finally starts to plateu as you burn out the reactants.

  
• Aswell as using grams and cm3, we can also use moles or dm3 and per minute
• When using moles you can still do quantity of reactant used/time taken or product formed
• Rate would start off really fast when there are loads of reactants that can react together and then slow down as the reaction progresses and the reactants get used up.
• If you have more reactants than normal, this means that they're going to react faster because there's more molecules available to collide with one another.