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.

Related Chemistry A Level answers

All answers ▸

Explain the resistance to bromination of benzene in comparison to phenol.


Why does a catalyst speed up a chemical reaction?


Describe the changes in equilibrium of ethanol production from ethene and water (enthalpy of reaction is ∆H = - 46 kJ/mol) when: (a) a high pressure is applied; (b) ethanol concentration is increased; (c) temperature is increased; (d) a catalyst is used.


Give and explain 2 of the anomalous properties of ice caused by hydrogen bonding (3)


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences