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Rates of reaction

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Question 5

A student investigated the rate of reaction between zinc and dilute hydrochloric acid. The volume of hydrogen gas produced was measured over time. The results are shown in the table and plotted on the graph in Figure 1. A tangent has been drawn on the curve at 40 seconds.

Figure 1

A line graph showing the volume of hydrogen gas produced in cm³ against time in seconds. The y-axis ranges from 0 to 80 cm³ and the x-axis ranges from 0 to 90 seconds. A curve starts at (0,0) and rises steeply, then starts to level off, passing through (40, 51) and reaching a plateau of 60 cm³ at 70 seconds. A straight tangent line is drawn touching the curve at t = 40 seconds. The tangent line extends from x = 0 to x = 80, passing through (0, 19) and (80, 83).

Time (seconds)Volume of hydrogen gas (cm³)
00
1018
2032
3043
4051
5056
6059
7060
8060
9060

Using the tangent in Figure 1, calculate the rate of reaction at 40 seconds.

rate of reaction=change in gas volumechange in time \text{rate of reaction} = \frac{\text{change in gas volume}}{\text{change in time}} rate of reaction=change in timechange in gas volume​

Give your answer to 2 decimal places.

[3]

Rates of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /Rates of reaction

Practise Edexcel GCSE Chemistry Rates of reaction with exam-style questions for Foundation and Higher tier. 166 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank