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Learning objective

Explain that bromine water is used as a test for alkenes.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Topic

Carbon compounds as fuels and feedstock

Subtopic

Cracking and alkenes

Aqa Gcse ChemistryOrganic chemistry

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Quick explanation

Explain that bromine water is used as a test for alkenes

  • This point belongs to Carbon compounds as fuels and feedstock, especially Cracking and alkenes.
  • You need to be able to explain that bromine water is used as a test for alkenes.
  • The key ideas to know are alkene and bromine water.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

alkenebromine water

Why it matters

This objective helps connect Cracking and alkenes to exam-style questions, flashcards, and revision notes for Carbon compounds as fuels and feedstock.

Quick student answer

How do you explain bromine water is used as a test for alkenes?

Direct answer

In Chemistry, this page helps you answer questions about bromine water is used as a test for alkenes within Carbon compounds as fuels and feedstock. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Alkene and Bromine water test.

Key terms

  • Alkene: A type of hydrocarbon that contains at least one carbon-carbon double bond, making it more reactive than alkanes.
  • Bromine water test: A chemical test used to identify alkenes, where the addition of bromine water results in a color change from brown to colorless.

Common trap

Misidentifying Bromine Water Reaction: Bromine water reacts only with alkenes (and alkynes) because the π bond is attacked, causing the orange–brown colour to disappear. Alkanes lack π bonds and do not react with bromine water, so the colour remains unchanged. Remind students that the test is specific for unsaturated hydrocarbons, not saturated ones.

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