Question detail
What is the general formula for the homologous series of alkenes?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
What is the general formula for the homologous series of alkenes?
Answer
The general formula for the homologous series of alkenes is CnH2n.
Explanation
This answer accurately states the general formula for alkenes, which is a fundamental concept in organic chemistry. It tests the student's recall of key information regarding the structure of alkenes. This response is aligned to Reactions of alkenes because it explains explain that alkenes tend to burn in air with smoky flames because of incomplete combustion using the correct AQA GCSE Chemistry organic context. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams. This response is aligned to Reactions of alkenes because it explains explain that alkenes tend to burn in air with smoky flames because of incomplete combustion using the correct AQA GCSE Chemistry organic context. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Incomplete Combustion Misunderstanding
Students often confuse the reason for smoky flames in alkenes with the presence of impurities in the fuel rather than understanding it is due to incomplete combustion.
Emphasize that smoky flames result from insufficient oxygen during combustion, leading to the production of soot and carbon particles.
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