A chemist has a sample of an unknown alkene with an unbranched chain. She finds that 1.40 g of the alkene reacts exactly with 4.00 g of bromine, Br2\mathrm{Br_{2}}Br2. One molecule of the alkene reacts with one molecule of bromine.
Relative atomic masses: H = 1, C = 12, Br = 80
Determine the molecular formula of the alkene. You must show your working.
In the product, the two bromine atoms are bonded to the second and third carbon atoms in the chain.
Name the alkene. Give a reason for your answer.
Calculate the mass of product formed. Give a reason for your answer.
The chemist adds bromine water to a sample of the product. Predict what she will see. Explain your answer.
36 exam-style questions on Edexcel GCSE Chemistry 10.2 Hydrocarbons, covering 10.2.1 Formulae and structures of the alkanes, 10.2.2 Alkenes and the C=C functional group, 10.2.3 Addition reactions of alkenes and testing for unsaturation, and 10.2.4 Combustion of alkanes and alkenes. Each one has a worked solution and a mark scheme showing where the marks go.