Curve Temperature / °C X 50 Y 35 Z 20 The graph shows three runs of the same reaction, X, Y and Z, carried out at three different temperatures. The table li...
Question 1 Report
| Curve | Temperature / °C |
|---|---|
| X | 50 |
| Y | 35 |
| Z | 20 |
The graph shows three runs of the same reaction, X, Y and Z, carried out at three different temperatures. The table lists the three temperatures used. Which curve, showing the steepest rise, is the run at the highest temperature?
Answer Details
On a volume against time graph the gradient is the rate, so the steepest curve is the fastest run. Raising the temperature increases the rate, because particles collide more often and a greater proportion of collisions reach the activation energy.
The graph shows one curve rising almost vertically at first and flattening earliest, one rising less sharply, and one climbing most gently. The steepest curve is X, so X is the run at the highest temperature, which the table gives as 50 °C. The middle curve Y is 35 °C and the shallowest curve Z is 20 °C.
A common slip is to match curves by their final height instead of their steepness.
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