Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Carboxylic Acids
48 practice questions
Topics covered
Practice questions
11–20 of 48
Question 11
3 marks · Normal
Answer and see the solution →Explain how you can identify whether a molecule is a carboxylic acid, using both its structural formula and its name.
Question 12
4 marks · Normal
Answer and see the solution →The table below shows the molecular formulae of some carboxylic acids. Complete the table by filling in the missing names.
Carboxylic acids to name Molecular formula Name C2H4O2 C4H8O2 CH2O2 C3H6O2 Write your answers in the table.
Question 13
1 mark · Normal
Answer and check →Which of the following gives the main component of vinegar?
- A.methanoic acid
- B.propanoic acid
- C.ethanoic acid
- D.butanoic acid
Question 14
2 marks · Normal
Answer and see the solution →Give the molecular formula and the displayed formula for butanoic acid.
Question 15
4 marks · Normal
Answer and see the solution →The table shows several unbranched carboxylic acids:
Name Molecular formula methanoic acid CH2O2 propanoic acid C3H6O2 (a)[2 marks]Write the name and structural formula of the carboxylic acid with the molecular formula C2H4O2.
(b)[2 marks]State the number of carbon atoms in butanoic acid and write its name following IUPAC conventions.
Question 16
3 marks · Normal
Answer and see the solution →Vinegar contains ethanoic acid as its main component. A student finds that a 75 g bottle of vinegar contains 3.0 g of pure ethanoic acid.
Calculate the percentage by mass of ethanoic acid in this sample of vinegar. Give your answer to 2 significant figures.
Question 17
2 marks · Hard
Answer and see the solution →A student writes the name 'proponoic acid' for a carboxylic acid with three carbon atoms in a straight chain.
State the correct IUPAC name for this acid. Give one reason for your answer.
Question 18
5 marks · Hard
Answer and see the solution →Vinegar is commonly used in food and cleaning products.
(a)[1 mark]Name the main carboxylic acid found in vinegar.
(b)[1 mark]State its molecular formula.
(c)[1 mark]Draw the displayed formula for this acid.
(d)[1 mark]Suggest one property of this carboxylic acid that makes it useful in cleaning products.
(e)[1 mark]Explain why this acid is classified as a carboxylic acid, referring to its structure.
Question 19
2 marks · Hard
Answer and see the solution →Draw the structural formula for butanoic acid and state the total number of hydrogen atoms in one molecule.
Question 20
1 mark · Easy
Answer and see the solution →State the gas produced when magnesium metal reacts with dilute propanoic acid.