Paper 2 H - SAMPLE SET 1 Q9
9) Marble chips are mainly calcium carbonate (CaCO3).
A student investigated the rate of reaction between marble chips and hydrochloric acid (HCl).
Figure 9 shows the apparatus the student used.
A student investigated the rate of reaction between marble chips and hydrochloric acid (HCl).
Figure 9 shows the apparatus the student used.
9.1) Complete and balance the equation for the reaction between marble chips and hydrochloric acid.
[2 marks]
9.2) Table 4 shows the student’s results.
On Figure 10:
• Plot these results on the grid.
• Draw a line of best fit.
[4 marks]
• Plot these results on the grid.
• Draw a line of best fit.
[4 marks]
9.3) Sketch a line on the grid in Figure 10 to show the results you would expect if the experiment was repeated using 20 g of smaller marble chips.
Label this line A. [2 marks]
9.4) Explain, in terms of particles, how and why the rate of reaction changes during the reaction of calcium carbonate with hydrochloric acid. [4 marks]
Another student investigated the rate of reaction by measuring the change in mass. Figure 11 shows the graph plotted from this student’s results.
Label this line A. [2 marks]
9.4) Explain, in terms of particles, how and why the rate of reaction changes during the reaction of calcium carbonate with hydrochloric acid. [4 marks]
Another student investigated the rate of reaction by measuring the change in mass. Figure 11 shows the graph plotted from this student’s results.
9.5) Use Figure 11 to calculate the mean rate of the reaction up to the time the reaction
is complete.
Give your answer to three significant figures. [4 marks]
Give your answer to three significant figures. [4 marks]
Mean rate of reaction = ___________________ g/s
9.6) Use Figure 11 to determine the rate of reaction at 150 seconds.
Show your working on Figure 11.
Give your answer in standard form.
[4 marks]
Rate of reaction at 150 s = ___________________ g/s
(Total for Question 9 = 20 marks)