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SingaporeCombined ScienceQuick questions
Chemistry: Metals and Organic Chemistry
Quick questions on Alkanes, alkenes and homologous series explained: O-Level Combined Science
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are alkanes?Show answer
Alkanes have the general formula and contain only single carbon-carbon bonds, so they are saturated. Examples are methane , ethane and propane . Their main reactions are:
What are alkenes?Show answer
Alkenes have the general formula and contain a carbon-carbon double bond (), so they are unsaturated. Examples are ethene and propene . Because of the reactive double bond, their main reactions are addition reactions:
What is the bromine-water test?Show answer
Bromine water (orange/brown) is the standard test:
What are unbalanced combustion equations?Show answer
Check that carbon, hydrogen and oxygen all balance, often needing a fraction or doubling.
What is q1?Show answer
State the general formula of the alkanes and the general formula of the alkenes. [2 marks]
What is q2?Show answer
Describe how you would use bromine water to distinguish ethane from ethene, with the observations. [2 marks]
What is q3?Show answer
Name the type of reaction when ethene reacts with bromine, and write the equation. [2 marks]
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