Palladium acts as a heterogeneous catalyst in the reaction between an alkene with hydrogen by providing an alternative reaction route. Describe the stages of this reaction route. (3 marks)
The detail required for many A-level questions is indicated in the number of marks available. As this question awards 3 marks, 3 separate points must be made. For example, the first stage of a heterogeneous reaction usually involves mass transfer and adsorption of the reactant on surface active sites. Secondly, the bonds in the reactant molecule are weakened, allowing a surface reaction to take place. Lastly, the product is desorbed from the surface, and the active sites are free to adsorb another reactant molecule.
AS
Related Chemistry A Level answers
All answers ▸What is the effect of temperature on K(equilibrium constant)?
Explain how a buffer solution resists the pH change when an acid or alkali is added.
A reaction, A + B -> C, is considered second order with respect to A and first order with respect to B. What is the effect of simultaneously doubling the concentration of A and B on the rate of reaction?
State the element in period 3 that has the highest melting point and explain your answer.