Chem Rate of Rxn Ws2

Secondary 4 Express Pure Chemistry – Rate of Reaction Worksheet 2 Page 1 of 12 Name: _____________________( ) Class: _______ Date ________ 1 Zinc reacts with hydrochloric acid. Which solution would give the fastest initial rate of reaction? A 80 g of HCl in 1000 cm3 of water B 40 g of HCl in 1000 cm3 of water C 20 g of HCl in 100 cm3 of water D 8 g of HCl in 50 cm3 of water 2 Glucose is converted into ethanol and carbon dioxide by fermentation. The rate of reaction can be measured by the volume of carbon dioxide gas produced per minute. The graph shows how the volume of carbon dioxide produced per minute changes with temperature. volume of carbon dioxide gas produced per minute 0 10 20 30 40 50 60 70 temperature / oC From the graph, which statement is correct? A The reaction is slowest at 0oC. B The reaction is fastest at about 60oC. C The rate of reaction always increases when the temperature increases. D The rate of reaction is greatest at about 40oC. 3 Which section of the Periodic Table is most likely to contain an element suitable for use as a catalyst in an industrial process? A the alkali metals B the halogens C the noble gases D the transition elements

Secondary 4 Express Pure Chemistry – Rate of Reaction Worksheet 2 Page 2 of 12 4 In terms of particle theory, why do smaller pieces of solid react more quickly with liquid reactant than an equal mass of larger pieces of solid? A There are stronger forces between the solid and the colliding particles . B The solid has a larger surface area for particles of the liquid to collide with. C The particles of the liquid collide with each other more frequently. D The particles of liquid do not have to break so many bonds in the solid. 5 Magnesium ribbon was reacted with hydrochloric acid. The volume of hydrogen gas produced was measured for the first 40 seconds. 0 10 20 30 40 50 0 5 10 15 20 25 30 35 40 time from start of reaction / s volume of hydrogen gas / cm3 What was the average rate of reaction is terms of volume of gas produced per second? A 0.8 cm3/s B 5.0 cm3/s C 8 cm3/s D 80 cm3/s 6 Copper(II) oxide powder catalyses the decomposition of hydrogen peroxide. In a laboratory experiment, copper(II) oxide was mixed with aqueous hydrogen peroxide in a beaker. What was present in the beaker when the reaction was complete? A a colourless liquid and a black solid B a blue liquid only C a shiny brown solid and a colourless liquid D a black solid only

Secondary 4 Express Pure Chemistry – Rate of Reaction Work