11.6. Alcohols
A subsection of Chemistry, 0620, through 11. Organic chemistry
Listing 10 of 234 questions
This question is about alcohols. The structure of compound P is shown. C O H H C C H H H H What feature of the structure of compound P shows that it is unsaturated? Describe how the colour of aqueous bromine changes when an excess of compound P is added to it. from to  The melting point of compound P is –129 °C. The boiling point of compound P is 97 °C. What is the physical state of compound P at –120 °C? Explain your answer. Ethanol is an alcohol with two carbon atoms. Draw the structure of ethanol showing all of the atoms and all of the bonds.  Ethanol can be manufactured by fermentation. Complete the sentences about fermentation using words from the list. 30 °C 300 °C distillation electrolysis elements enzymes salt sugar A flask containing solution and yeast is heated to . The yeast contains which catalyse the reaction. The ethanol is separated by . Ethanol can be used as a fuel. Give one other use of ethanol in industry. The energy level diagram for the complete combustion of ethanol is shown. energy ethanol + oxygen carbon dioxide + water progress of reaction Explain how this diagram shows that the reaction is exothermic. Carbon dioxide and water can be formed when ethanol burns in a limited supply of air. State the name of two other products which can be formed when ethanol burns in a limited supply of air. and  
0620_s18_qp_33
THEORY
2018
Paper 3, Variant 3
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Ethanol is a member of the homologous series of alcohols. Give two characteristics of members of a homologous series.  The structure of ethanol is shown. C H H O C H H H H Complete the dot‑and‑cross diagram to show the electron arrangement in a molecule of ethanol. Show outer shell electrons only. C H H O C H H H H Ethanol can be produced by the catalytic addition of steam to ethene or by the fermentation of glucose. Write a chemical equation for the production of ethanol by the catalytic addition of steam to ethene. Write a chemical equation for the production of ethanol by the fermentation of glucose, C6H12O6. State one advantage of producing ethanol by the catalytic addition of steam to ethene. Your answer must not refer to cost. State one advantage of producing ethanol by the fermentation of glucose. Your answer must not refer to cost. Ethanol can be oxidised to ethanoicacid. State the chemical reagent needed to oxidise ethanol to ethanoicacid. Ethanoicacid reacts with ethanol in the presence of an acid catalyst. The products are an organic compound and water. Draw the structure of the organic compound formed. Show all of the atoms and all of the bonds. State the name of the organic compound formed. Which homologous series does the organic compound formed belong to? Ethanoicacid, CH3COOH, is a weak acid. It reacts with copper(carbonate to form the salt copper(ethanoate, Cu(CH3COO)2. What is meant by the term weak when applied to acids? Describe how a crystalline sample of copper(ethanoate can be prepared starting with ethanoicacid and copper(carbonate. Write the word equation for the reaction between ethanoicacid and copper(carbonate.
0620_s18_qp_43
THEORY
2018
Paper 4, Variant 3
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