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Alcohols
This topic links alcohol functional-group chemistry to preparation and analysis.
5
Objectives
25
Flashcards
25
Questions
90 min
Study time
AQAA LevelChemistryOrganic chemistry
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Syllabus checklist
What you need to know
5 objective pages available
Alcohol production and reactions5 objectives
- Compare ethanol production by fermentation and hydration of ethene.
- Write equations for combustion of alcohols.
- Describe oxidation of primary and secondary alcohols.
- Explain elimination of water from alcohols to form alkenes.
- Required practical: test for alcohols as part of organic functional-group analysis.
Key terms
fermentationhydration of ethenecombustion of alcoholsethanol combustion equationoxidation of alcoholsprimary alcoholelimination reactiondehydrationalcohol testfunctional group analysis
Exam tips
- Understanding Ethanol Production Methods: Compare the processes of fermentation and hydration of ethene for ethanol production.
- Writing Combustion Equations for Alcohols: Remember to balance the combustion equations for alcohols by ensuring the number of atoms on both sides is equal. Link the point to Alcohol production and reactions, then state the evidence, calculation, mechanism, observation, or conclusion required by the question.
Common mistakes
- Fermentation vs Hydration of Ethene: Fermentation is a biological process using yeast to convert sugars into ethanol and carbon dioxide, typically at lower temperatures and without the need for high pressure. In contrast, hydration of ethene is a chemical reaction where ethene reacts with steam in the presence of a catalyst at high temperature and pressure. Understanding these differences helps in selecting the appropriate method based on the desired conditions and scale of production.
- Combustion Equation Mistake: To write the balanced equation for the combustion of ethanol (C2H5OH), use the formula: C2H5OH + O2 → CO2 + H2O. First, balance the carbon atoms: 2 CO2. Then, balance the hydrogen atoms: 3 H2O. Finally, balance the oxygen atoms: C2H5OH + 3 O2 → 2 CO2 + 3 H2O. The final balanced equation is C2H5OH + 3 O2 → 2 CO2 + 3 H2O.
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