Chem Rate of Rxn Ws1

Secondary 4 Pure Chemistry – Rate of reaction worksheet 1 Page 1 of 3 Rate of Reactions Name: _____________________( ) Class: _______________ Date ________ Deadline_____________ Answer all questions in the spaces provided. 1. A student carried out an experiment to investigate the rate of reaction between excess calcium carbonate and dilute hydrochloric acid. The results of the investigation is shown. Time/min 10 20 30 40 50 60 70 Total volume/cm3 13 24 33 41 45 48 48 (a) Draw a diagram to show the apparatus that could be used to give the results above. Label your diagram accordingly. lumped CaCO3

Secondary 4 Pure Chemistry – Rate of reaction worksheet 1 Page 2 of 3 (b) Plot a graph of total volume collected against time on the axes given. Label the your graph as Flask A. (c) Calculate the average speed of the reaction. (d) From the graph, find the time take for half the reaction to be completed. _____________________________________________________ Total volume/cm3 Time/min

Secondary 4 Pure Chemistry – Rate of reaction worksheet 1 Page 3 of 3 (e) From the graph, find the speed of reaction at the 30th minute. _____________________________________________________ (f) The reaction is said to have stopped an hour later since it started. Is the above statement true or false ? Explain the choice of your answer. _____________________________________________________ _____________________________________________________ _____________________________________________________ (g) Using powdered CaCO3 would increase the rate of the reaction. With a simple diagram, explain why this is so. _____________________________________________________ _____________________________________________________ _____________________________________________________ (h) Sketch, on the same axes, the curve you would expect if the experiment was repeated using a more concentrated acid. Label the sketch as Flask B.