Worksheet: Progress–Time Graphs

In this worksheet, we will practice plotting the progress of a reaction over time and identifying the species and processes contributing to the data.

Q1:

The graph shows the relative abundance of gases A and B during a reaction where A transforms into B .

Which of the following statements is false?

  • A The rate of the reaction is high at the start and low at the end.
  • B At time 0, the relative abundance of B is 100%.
  • C At the end of the reaction, A is completely consumed.
  • D The lines for A and B cross at relative abundance = 50%.
  • E As the quantity of A decreases, the quantity of B increases.

Q2:

Shown in the graph are the relative abundance of gases A and B during a reaction where A transforms into B .

At time 𝑡 , a modification to the system dramatically alters the abundances of A and B . Which of the following is the least likely explanation for the changes observed?

  • A The temperature increased.
  • B A catalyst was added.
  • C More of A was added.
  • D The pressure increased.
  • E The gases were stirred.

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