Fig. 1 shows an energy profile prepared by a resin manufacturer. The reaction joins small carbon-containing molecules to make a tough coating for metal tool...
Question 1 Report
Fig. 1 shows an energy profile prepared by a resin manufacturer. The reaction joins small carbon-containing molecules to make a tough coating for metal tools. The reaction begins with reactants at 120 kJ and forms products at 70 kJ. The highest point on the uncatalysed pathway is 210 kJ. A catalyst gives a second route whose highest point is 155 kJ. The company needs a rapid reaction at a lower temperature so that less energy is used. The catalyst is not used up during the reaction.
(a) Give the activation energy for the uncatalysed reaction. [2]
(b) Use Fig. 1 to calculate the energy change for the reaction. [3]
(c) Describe whether the reaction is exothermic or endothermic. Use the energy values in Fig. 1. [3]
(d) Give the activation energy when the catalyst is used and calculate the decrease in activation energy. [4]
(e) Describe how a catalyst allows the manufacturer to save energy during production. [4]
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