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The diagram shows the structure of a molecule of ethene - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Question 2
The diagram shows the structure of a molecule of ethene. Ethene is unsaturated. Ethene is a hydrocarbon. Explain why ethene is described as an unsaturated hydrocar... show full transcript
Worked Solution & Example Answer:The diagram shows the structure of a molecule of ethene - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Step 1
Explain why ethene is described as an unsaturated hydrocarbon.
Answer
Ethene is described as an unsaturated hydrocarbon because it contains at least one carbon-to-carbon double bond. Unsaturated hydrocarbons have one or more double or triple bonds between carbon atoms, which distinguishes them from saturated hydrocarbons that only contain single bonds. This double bond leads to the ability of ethene to undergo addition reactions, making it reactive compared to saturated hydrocarbons.
Step 2
Describe what you would see when a sample of ethene is shaken with bromine water.
Answer
When a sample of ethene is shaken with bromine water, the solution will change color from brown to colorless. This happens because ethene reacts with bromine, resulting in the formation of a dibromoalkane, effectively decolorizing the bromine water.