Organic Chemistry – Exam with 100% Correct
Answers 2024/2025
Wine contains ethanol.
A bottle of wine was left open in air.
After a few days, the wine tasted of vinegar.
Vinegar is a solution of ethanoic acid in water.
Explain how oxidation causes the wine to taste of vinegar after a few days.
[3 marks] - ANSWER-air contains oxygen
which oxidises ethanol
to produce ethanoic acid
Formula for alkanes - ANSWER-CnH2n+2
Formula for methane - ANSWER-CH4
Formula for ethane - ANSWER-C2H6
Formula for propane - ANSWER-C3H8
Formula for butane - ANSWER-C4H10
Formula for pentane - ANSWER-C5H12
Formula for hexane - ANSWER-C6H14
Homologous series - a group of compounds with: - ANSWER--the same general formula
-the same functional group
-similar chemical properties
, Formula for ethene - ANSWER-C2H4
Formula for propene - ANSWER-C3H6
Formula for butene - ANSWER-C4H8
Test for double bond - ANSWER-Alkenes decolourise bromine water
yellow -> colourless
Saturated - ANSWER-Full of hydrogen no double bonds
Unsaturated - ANSWER-More hydrogen could be added see double bond
Polymer - ANSWER-Long chain molecule made from lots of small molecules joined together
Monomer - ANSWER-Small molecules that join together to make polymers
Formula for methanol - ANSWER-CH3OH
Formula for ethanol - ANSWER-C2H5OH
Formula for propanol - ANSWER-C3H7OH
Formula for butanol - ANSWER-C4H9OH
Uses of alcohols - ANSWER--drinks
-solvents
-fuel
Answers 2024/2025
Wine contains ethanol.
A bottle of wine was left open in air.
After a few days, the wine tasted of vinegar.
Vinegar is a solution of ethanoic acid in water.
Explain how oxidation causes the wine to taste of vinegar after a few days.
[3 marks] - ANSWER-air contains oxygen
which oxidises ethanol
to produce ethanoic acid
Formula for alkanes - ANSWER-CnH2n+2
Formula for methane - ANSWER-CH4
Formula for ethane - ANSWER-C2H6
Formula for propane - ANSWER-C3H8
Formula for butane - ANSWER-C4H10
Formula for pentane - ANSWER-C5H12
Formula for hexane - ANSWER-C6H14
Homologous series - a group of compounds with: - ANSWER--the same general formula
-the same functional group
-similar chemical properties
, Formula for ethene - ANSWER-C2H4
Formula for propene - ANSWER-C3H6
Formula for butene - ANSWER-C4H8
Test for double bond - ANSWER-Alkenes decolourise bromine water
yellow -> colourless
Saturated - ANSWER-Full of hydrogen no double bonds
Unsaturated - ANSWER-More hydrogen could be added see double bond
Polymer - ANSWER-Long chain molecule made from lots of small molecules joined together
Monomer - ANSWER-Small molecules that join together to make polymers
Formula for methanol - ANSWER-CH3OH
Formula for ethanol - ANSWER-C2H5OH
Formula for propanol - ANSWER-C3H7OH
Formula for butanol - ANSWER-C4H9OH
Uses of alcohols - ANSWER--drinks
-solvents
-fuel
