Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
41–44 of 44 · Easy
Question 41
5 marks · Easy
Answer and see the solution →This question is about alkenes with up to four carbon atoms and their physical properties.
(a)[1 mark]Draw the displayed formula of ethene.
(b)[1 mark]Give the general formula for all alkenes.
(c)[2 marks]State the physical state of propene and butene at room temperature.
(d)[1 mark]Complete this sentence: "The physical state of small alkenes (up to butene) at room temperature is similar to the physical state of small _____."
Question 42
5 marks · Easy
Answer and see the solution →The table below shows two hydrocarbon molecules.
Molecule Structural formula A CH_3CH=CH_2 B CH_3CH_2CH_3 (a)[2 marks]Which molecule is unsaturated? Explain your answer.
(b)[1 mark]State how the presence of a C=C bond affects the chemical properties of alkenes.
(c)[1 mark]Describe the physical state of molecule A at room temperature.
(d)[1 mark]Compare the boiling points of molecule A and molecule B.
Question 43
5 marks · Easy
Answer and see the solution →Answer the questions about alkenes below.
(a)A straight-chain alkene has the formula C4H8. Draw the displayed formula of one isomer of C4H8 and name it.
(i)[1 mark]Draw the displayed formula.
(ii)[1 mark]Name this isomer.
(b)[2 marks]The general formula for alkenes is CnH2n. Calculate the molecular formula of the alkene with 7 carbon atoms.
(c)[1 mark]Explain how the physical state of the C7 alkene compares to the C4 alkene at room temperature.
Question 44
5 marks · Easy
Answer and see the solution →This question is about the structure and properties of small alkenes.
(a)[1 mark]Draw the displayed formula of propene.
(b)[1 mark]State whether butene is a gas, liquid or solid at room temperature.
(c)[2 marks]Describe the trend in boiling points as the number of carbon atoms increases from ethene to butene.
(d)[1 mark]Name the homologous series to which these alkenes belong.