Leo wanted to investigate the effect of temperature on the rate of carbon dioxide production by yeast during respiration. He set up the apparatus shown below:
The paraffin layer prevents the entry of oxygen into the glucose and yeast mixture. Explain why this is necessary.
Leo varied the temperature of the water bath between 10 ∘C10\ ^\circ\text{C}10 ∘C and 60 ∘C60\ ^\circ\text{C}60 ∘C.
Sketch the expected shape of the graph if the rate of carbon dioxide production (yyy-axis) is plotted against temperature (xxx-axis).
State the dependent variable in this experiment.
State the independent variable in this experiment.
Give two variables, other than the paraffin layer, that Leo would need to keep the same in his experiment.
Suggest one way that Leo could improve the reliability of his experiment.
Suggest how Leo could improve the accuracy of his measurement of the rate of carbon dioxide production.
Write the word equation for the anaerobic respiration of yeast.
