C2 H - Sample set 1 Q4
4) Alkanes and alkenes are hydrocarbons.
The structure of a molecule of butane is shown.
(a) Which of the following is the empirical formula for butane?
(1)
(b) Figure 5 shows some information about the alkenes, ethene and propene.
Complete the table. The structure of propene must show all covalent bonds. (2)
Complete the table. The structure of propene must show all covalent bonds. (2)
(c) Butene reacts with steam to produce butanol.
(i) Calculate the maximum mass of butanol, C4
H9OH, that can be produced when 1.4kg of butene, C4H8, reacts with excess steam.
(relative atomic masses: H = 1, C = 12, O = 16
relative molecular mass of butene, C4H8 = 56) (3)
(relative atomic masses: H = 1, C = 12, O = 16
relative molecular mass of butene, C4H8 = 56) (3)
mass of butanol = .............................................................. kg
(ii) What type of reaction takes place between butene and steam?
(1)
(d) A sample of each of three hydrocarbons, X, Y and Z, was shaken with bromine water. Bromine water is orange coloured.
The results are:
X orange mixture becomes colourless
Y orange mixture becomes colourless
Z mixture remains orange
Using the results, comment on the structures of the hydrocarbons X, Y and Z. (2)
(Total for Question 4 = 9 marks)
The results are:
X orange mixture becomes colourless
Y orange mixture becomes colourless
Z mixture remains orange
Using the results, comment on the structures of the hydrocarbons X, Y and Z. (2)
(Total for Question 4 = 9 marks)