Chemistry_Grade_10-12 (1).pdf

B the process used to convert heavy hydrocarbons into

Info icon This preview shows pages 477–480. Sign up to view the full content.

View Full Document Right Arrow Icon
(b) The process used to convert heavy hydrocarbons into light hydrocarbons. (c) The process of separating nitrogen from liquid air. (d) The main raw material in the chloralkali industry. (e) A compound given to a plant to promote growth. 463
Image of page 477

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
23.6 CHAPTER 23. THE CHEMICAL INDUSTRY - GRADE 12 (f) An electrolyte used in lead-acid batteries. 2. Indicate whether each of the following statements is true or false. If the state- ment is false, rewrite the statement correctly. (a) The longer the hydrocarbon chain in an organic compound, the more likely it is to be a solid at room temperature. (b) The main elements used in fertilisers are nitrogen, phosphorus and potas- sium. (c) A soap molecule is composed of an alcohol molecule and three fatty acids. (d) During the industrial preparation of chlorine and sodium hydroxide, chem- ical energy is converted to electrical energy. 3. For each of the following questions, choose the one correct answer from the list provided. (a) The sequence of processes that best describes the conversion of coal to liquid fuel is: i. coal gas purification SAS reactor liquid hydrocarbon ii. coal autothermal reactor Sasol slurry phase F-T reactor liquid hydrocarbon iii. coal coal purification synthesis gas oil iv. coal coal gasification gas purification SAS reactor liquid hydrocarbons (b) The half-reaction that takes place at the cathode of a mercury cell in the chloralkali industry is: i. 2Cl Cl 2 + 2e ii. 2Na + + 2e 2Na iii. 2H + + 2e H 2 iv. NaCl + H 2 O NaOH + HCl (c) In a zinc-carbon dry cell... i. the electrolyte is manganese (IV) oxide ii. zinc is oxidised to produce electrons iii. zinc is reduced to produce electrons iv. manganese (IV) dioxide acts as a reducing agent 4. Chloralkali manufacturing process The chloralkali (also called ’chlorine-caustic’) industry is one of the largest electrochemical technologies in the world. Chlorine is produced using three types of electrolytic cells. The simplified diagram below shows a membrane cell. + Power supply - Saturated NaCl Depleted NaCl M Gas B Gas A N NaOH (a) Give two reasons why the membrane cell is the preferred cell for the prepa- ration of chlorine. (b) Why do you think it is advisable to use inert electrodes in this process? (c) Write down the equation for the half-reaction taking place at electrode M. (d) Which gas is chlorine gas? Write down only Gas A or Gas B. 464
Image of page 478
CHAPTER 23. THE CHEMICAL INDUSTRY - GRADE 12 23.6 (e) Briefly explain how sodium hydroxide forms in this cell. (DoE Exemplar Paper 2,2007) 5. The production of nitric acid is very important in the manufacture of fertilis- ers. Look at the diagram below, which shows part of the fertiliser production process, and then answer the questions that follow. (1) N 2 (g) + H 2 (3) (2) + O 2 NO + H 2 O Ostwald Process (4) (a) Name the process at (1).
Image of page 479

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 480
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern