Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
General formulae
18 practice questions
Practice questions
11–18 of 18
Question 11
3 marks · Normal
Answer and see the solution →An alkene and an alkane both contain 4 carbon atoms. Explain why they have different chemical properties. Refer to functional groups in your answer.
Question 12
4 marks · Normal
Answer and see the solution →The table shows the first four members of the alkene homologous series:
Name Formula Ethene C2H4 Propene C3H6 Butene C4H8 Pentene C5H10 (a)[1 mark]State the general formula for alkenes.
(b)[1 mark]Name the next member of this series.
(c)[1 mark]Give the molecular formula for hexene, the sixth member of the series.
(d)[1 mark]Explain the pattern you see in the number of hydrogen atoms for each new member of the series.
Question 13
1 mark · Normal
Answer and check →Which of the following best describes a functional group in organic chemistry?
- A.A group of atoms that determines the chemical properties of a compound
- B.A compound that contains carbon and hydrogen atoms
- C.A general formula that shows the ratio of elements
- D.The number of carbon atoms in a homologous series
Question 14
2 marks · Normal
Answer and see the solution →Give the general formula for alkanes and state the formula for butane.
Question 15
4 marks · Normal
Answer and see the solution →Each member of a homologous series contains the same functional group. The alcohol series contains the functional group –OH.
(a)[2 marks]Describe, with an example, what is meant by a functional group.
(b)[2 marks]Explain why all alcohols undergo similar chemical reactions.
Question 16
2 marks · Hard
Answer and see the solution →State what is meant by the term 'functional group' in organic chemistry. Explain why functional groups are important when studying homologous series.
Question 17
5 marks · Hard
Answer and see the solution →Table 1 shows three members of a homologous series.
Table 1 Name Molecular formula Methanoic acid CH2O2 Ethanoic acid C2H4O2 Propanoic acid C3H6O2 (a)[1 mark]State the general formula for this homologous series.
(b)[1 mark]Name the functional group found in all members of this homologous series.
(c)[1 mark]Give one feature, other than the general formula, that all members of a homologous series share.
(d)[2 marks]Explain why the compounds in this series have similar chemical properties.
Question 18
2 marks · Hard
Answer and see the solution →Describe, with an example, what is meant by a functional group in organic chemistry.