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It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school. All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution. www.pixl.org.ukwww.pixl.org.ukThe PiXL Club Ltd, Company number 07321607 © Copyright The PiXL Club Ltd, 2016 NB: Some of the QWC style questions have more marks than 6 available this is to allow for students to see all of the possible marking points. Commissioned by The PiXL Club Ltd. February 2016 This is a narrated Walking Talking Mark slideshow. It will run automatically when you press start slideshow from the beginning.

3. Question – Haber process In the Haber process a pressure of 150 atmospheres and a temperature of 450 °C are used with an iron catalyst. QWC: Explain why these conditions are best to use in the Haber process for the manufacture of ammonia. (7 marks)

4. Question – Haber process In the Haber process a pressure of 150 atmospheres and a temperature of 450 °C are used with an iron catalyst. QWC: Explain why these conditions are best to use in the Haber process for the manufacture of ammonia. (7 marks) A high pressure is needed to give an increased yield. The equilibrium shifts to the right side since there is a decrease in the number of molecules going from left to right. A high temperature is needed to reach equilibrium more quickly due to the molecules moving faster because they have more energy. A catalyst causes equilibrium to be reached more quickly because it lowers the activation energy and increases the rate of reaction.