On a graph of volume of gas against time, one reaction line is steeper than another. What does this show?

Answer and explanation

Correct answer: B. The reaction with the steeper line is faster

  1. Step 1: The gradient is the rate of reaction.
  2. Step 2: A steeper line means more gas per second, so a faster reaction.
Answer
The reaction with the steeper line is faster.
Why not the others: The steeper line has a smaller final volume: the final volume is the height of the line at the end. The steeper line reacts more slowly: a steeper line shows a greater rate. The steeper line used a catalyst: this may be true but is not shown by steepness alone.

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