A-A* (AO3/4) - Rate Equations

Test yourself on A-A* (AO3/4) - Rate Equations

• Magnesium is added to warm HCl and the volume of hydrogen released is recorded. The results of three different experiments are shown below.
  
  In one experiment, the amount of magnesium and the concentration of HCl was kept the same but the volume of HCl was halved. Which experiment was this?

• Which of the following options could explain the results shown on the green curve?