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“How can the foam in the Elephant’s toothpaste reaction take 6 seconds to…

- - - - Yeast
        
        Concentration of yeast
        
        Homogenous mixtures will be hard to concretely identify
        
        Cheap to change the concentration of yeast
        
        type of yeast
  - - - Both systematic and random errors can occur when attempting to obtain required concentrations of solutions
    - - Can be measured in both volume and by mass
      - Concentration of reactants can be easily altered
  - - - Fluctuations in environmental temperatures are guaranteed to occur
      - Changes in environmental temperatures have less of an effect on rate of reaction in comparison to direct changes in temperature of solution
    - - Hard to maintain temperature of water
      - heat bath
        
        regulated using thermometer
        
        kept consistent with the addition of water
        
        or could use bunsen burner to regulate temp. to +/- x amount of temp difference
  - - - endothermic forward reaction
      - exothermic forward reaction
      - increased pressure will favour the back reaction due to it being the side with a lower number of gas moles
- - - - resolution
      - height of cylinder
      - circumference of cylinder
    - - digital scale
      - analogue scale