Alkenes
Overview
While alkanes are the backbone of fuels, alkenes are the backbone of the chemical industry. Their carbon-carbon double bond makes them far more reactive, and this reactivity is what allows chemists to build plastics, make ethanol, and create countless everyday materials.
In this lesson you will learn the general formula for alkenes, why they are called unsaturated hydrocarbons, how to draw and name them, and how the bromine water test distinguishes them from alkanes.
Objectives
- Know that alkenes contain the functional group C=C
- Know the general formula for alkenes
- Explain why alkenes are classified as unsaturated hydrocarbons
- Understand how to draw the structural and displayed formulae for alkenes with up to four carbon atoms in the molecule, and name the unbranched-chain isomers
- Describe how bromine water can be used to distinguish between an alkane and an alkene
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Alkenes. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The general formula for alkenes is: A) CnH2n+2 B) CnH2n C) CnH2n-2 D) CnHn+2 Answer: B
- Alkenes are described as unsaturated because they: A) Dissolve in water B) Contain only single bonds C) Contain a C=C double bond D) Are gases at room temperature Answer: C
- When ethene reacts with bromine water, the bromine water: A) Turns blue B) Stays orange C) Is decolourised D) Turns red Answer: C
- The reaction between an alkene and bromine is an example of: A) Combustion B) Decomposition C) Addition reaction D) Neutralisation Answer: C
- Which of these is the molecular formula for propene? A) C3H8 B) C3H6 C) C2H4 D) C4H8 Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
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