Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
251–260 of 335 · Normal
Question 251
6 marks · Normal
Answer and see the solution →A bottle of vinegar is labelled as containing ethanoic acid.
(a)[1 mark]State the name of the main acid found in vinegar.
(b)[2 marks]Explain what is meant by the term 'weak acid', using ethanoic acid as an example.
(c)[2 marks]Vinegar reacts with magnesium metal. Describe the reaction and give one reason why the reaction is slower compared to dilute hydrochloric acid.
(d)[1 mark]State one observation you would make when magnesium reacts with vinegar.
Question 252
6 marks · Normal
Answer and see the solution →A student wants to prepare a sample of sodium butanoate by reacting sodium metal with butanoic acid.
(a)[2 marks]Draw the displayed formula for butanoic acid.
(b)[2 marks]Write a balanced symbol equation (using molecular formulae) for the reaction between sodium metal and butanoic acid.
(c)[2 marks]Calculate the mass of sodium metal required to react completely with 0.10 mol of butanoic acid. (Relative atomic mass: Na = 23)
Question 253
6 marks · Normal
Answer and see the solution →Study the information about the carboxylic acid family and their behaviour as acids.
(a)[2 marks]Give the name and molecular formula of the unbranched-chain carboxylic acid with three carbon atoms.
(b)[2 marks]Explain why carboxylic acids, such as the one named in (a), are described as weak acids.
(c)[2 marks]A student adds magnesium strip to a solution of this acid. The reaction is much slower than when magnesium is added to dilute sulfuric acid. Explain two reasons for this difference.
Question 254
2 marks · Normal
Answer and see the solution →Describe what happens in an esterification reaction between propanoic acid and methanol.
Question 255
4 marks · Normal
Answer and see the solution →This question is about the naming of esters.
(a)[1 mark]State the name of the ester formed from butanoic acid and propanol.
(b)[1 mark]Give the name of the alcohol used to prepare propyl methanoate.
(c)[1 mark]A student writes the name 'ethyl propanoate'. Write the name of its carboxylic acid component.
(d)[1 mark]Explain what the '-oate' part of an ester’s name represents.
Question 256
3 marks · Normal
Answer and see the solution →Methanol reacts with benzoic acid (C6H5COOH) to form an ester.
Write the structural formula for the ester produced when one molecule of each reactant combine.
Question 257
4 marks · Normal
Answer and see the solution →The following table shows the names of several esters and their uses.
Ester Name Alcohol Used Carboxylic Acid Used Typical Use Methyl methanoate Methanol Methanoic acid Solvent Ethyl ethanoate Ethanol Ethanoic acid Nail polish remover Butyl propanoate Butanol Propanoic acid Flavouring Propyl butanoate Propanol Butanoic acid Perfume (a)[1 mark]Which ester in the table is made from propanol and butanoic acid?
(b)[1 mark]Name the acid used to produce butyl propanoate.
(c)[1 mark]State the typical use of methyl methanoate.
(d)[1 mark]Give the alcohol required to produce ethyl ethanoate.
Question 258
1 mark · Normal
Answer and check →Which of the following is the correct structural formula for isopropyl ethanoate, formed from propan-2-ol and ethanoic acid?
- A.CH3COOCH(CH3)2
- B.CH3COOC3H7
- C.C2H5COOCH3
- D.CH3CH2COOCH2CH3
Question 259
2 marks · Normal
Answer and see the solution →State the two substances required to make propyl ethanoate. Give both the alcohol and the acid you would use.
Question 260
4 marks · Normal
Answer and see the solution →This question concerns the naming of esters.
(a)[1 mark]State the name of the ester formed from methanoic acid and butanol.
(b)[1 mark]Give the formula for the acid required to make ethyl propanoate.
(c)[2 marks]Write the name of the alcohol and the acid required to make butyl methanoate.