Alcohols and Carboxylic Acids
Identify, name and draw straight-chain alcohols and carboxylic acids, connect molecular size to properties, and describe their uses and acid reactions.
How to study National 5 Chemistry
Move between particle explanations, formulae, calculations, experimental evidence and justified conclusions, while using official materials for exact written-paper and assignment practice.
Core concepts
Concept 1
Alcohols contain the hydroxyl functional group and use the general formula CₙH₂ₙ₊₁OH for saturated straight chains.
Exam cue: Locate and number the functional group before naming the carbon chain.
Concept 2
Carboxylic acids contain the carboxyl functional group and use the general formula CₙH₂ₙ₊₁COOH for saturated straight chains.
Exam cue: Use the whole molecular structure when counting carbons in a carboxylic acid.
Concept 3
Solubility generally decreases and melting and boiling points generally increase as these molecules become larger; carboxylic acids form salts in their acid reactions.
Exam cue: Link a physical-property trend to increasing molecular size and stronger intermolecular attraction.
Risk pitfalls and guardrails
Counting the carbon of the carboxyl group separately from the parent chain.
Guardrail: Check formulae, charges, units, state or experimental conditions before committing to the final conclusion.
Calling every hydroxyl-containing formula an alcohol without checking the structure.
Guardrail: Check formulae, charges, units, state or experimental conditions before committing to the final conclusion.
Claiming that all alcohols or carboxylic acids are completely miscible with water.
Guardrail: Check formulae, charges, units, state or experimental conditions before committing to the final conclusion.
Memory anchors
Hydroxyl group
Alcohols contain the hydroxyl functional group, –OH.
Alcohol formula
Saturated straight-chain alcohols follow CₙH₂ₙ₊₁OH.
Carboxyl group
Carboxylic acids contain the carboxyl functional group, –COOH.
Carboxylic acid formula
Saturated straight-chain carboxylic acids follow CₙH₂ₙ₊₁COOH.
Chain-length trend
As molecular size increases, boiling point generally rises and water solubility generally falls.
Carboxylate salt
A carboxylic acid reacts with a suitable metal or base to form a carboxylate salt.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which functional group identifies an alcohol?
What is the general formula of a saturated straight-chain alcohol?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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