A student investigated the rate of reaction between calcium hydrogencarbonate and hydrochloric acid.
Balance the chemical equation for this reaction:
Ca(HCO3)2+‾ HCl→CaCl2+2 H2O+2 CO2\mathrm{Ca(HCO_3)_2 + \underline{\quad}\,HCl \rightarrow CaCl_2 + 2\,H_2O + 2\,CO_2}Ca(HCO3)2+HCl→CaCl2+2H2O+2CO2
During the reaction, the student recorded the volume of carbon dioxide gas produced over time. The results are plotted below:
What happened to the rate of reaction between 60 and 90 seconds?
- The rate of reaction increased
- The rate of reaction decreased
- The rate of reaction stayed at zero
The student repeated the experiment at a lower temperature, keeping all other variables constant. How would the initial line of best fit compare to the original line on the graph?
- Initially the line of best fit would be less steep
- Initially the line of best fit would be the same steepness
- Initially the line of best fit would be steeper
Rate of reaction Questions
Practise AQA GCSE Chemistry Rate of reaction with exam-style questions for Foundation and Higher tier. 46 questions covering Calculating rates of reactions, Factors which affect the rates of chemical reactions, Collision theory and activation energy, and Catalysts, matched to the AQA GCSE Chemistry (8462) 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.