A technician at a chemical company checks a batch of hydrocarbon before it is used as feedstock to make polymers. The technician adds orange bromine water to a sample from the batch. The bromine water stays orange.
Which conclusion should the technician record?
The test was invalid because bromine water only reacts after heating.
The sample contains no alkene because the bromine water remained orange.
The sample contains an alkene because the bromine water remained orange.
The test was invalid because bromine water is used to identify alkanes.
91 exam-style questions on AQA GCSE Chemistry 7.1 Carbon compounds as fuels and feedstock, covering 7.1.1 Crude oil, hydrocarbons and alkanes, 7.1.2 Fractional distillation and petrochemicals, 7.1.3 Properties of hydrocarbons, and 7.1.4 Cracking and alkenes. Each one has a worked solution and a mark scheme showing where the marks go.