Starter quiz
- How many covalent bonds can a carbon atom form?
- one
- two
- three
- four ✓
- five
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- What are compounds that contain hydrogen and carbon atoms only called?
- 'hydrocarbons' ✓
- Which of the following equations for the complete combustion of alkanes is correct?
- alkane + oxygen → carbon monoxide + water
- alkane + oxygen → carbon dioxide + water ✓
- alkane + water → carbon + oxygen
- alkane + oxygen → carbon dioxide + hydrogen
- alkane + oxygen → carbon monoxide + hydrogen
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- Which of the following are possible products from the incomplete combustion of propene?
- carbon (soot) ✓
- carbon monoxide ✓
- oxygen
- ethene
- water ✓
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Which of the following is the general formula for alkanes? Use the image shown of an ethane molecule to help you work it out.- CₙH₂ₙ
- CₙH₂ₙ₊₁
- CₙH₂ₙ₊₂ ✓
- CₙH₂ₙ₊₃
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- Sort the following alkenes into order of increasing chain length, starting with the molecule that has the shortest chain.
- 1⇔ethene
- 2⇔propene
- 3⇔butene
- 4⇔pentene
- 5⇔hexene
Exit quiz
- Reactions of alkenes happen at their functional group. Which of the following is the functional group of alkenes?
- OH
- CH
- C=O
- C=C ✓
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- Match the following key terms to their definitions.
- unsaturated compounds⇔compounds that contain at least one carbon–carbon double covalent bond ✓
- saturated compounds⇔compounds that contain only single covalent bonds ✓
- alkenes⇔hydrocarbons that contain the C=C functional group ✓
- functional group⇔the atom or group of atoms responsible for the way a compound reacts ✓
- Which of the following statements about alkenes are correct?
- Longer alkenes have lower boiling points than shorter alkenes.
- Longer alkenes have higher boiling points than shorter alkenes. ✓
- Larger alkenes are less flammable than shorter alkenes. ✓
- Longer alkenes are more flammable than shorter alkenes.
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- What is the name for structures with the same molecular formula but different arrangements of atoms in space?
- 'isomers' ✓
Which two of the following reactants are needed to produce the product shown in the image?- propene and bromine
- ethene and bromine ✓
- propene and chlorine
- ethene and chlorine
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- Which of the following is the organic product when propene reacts with steam at a high temperature and pressure, in the presence of an acid catalyst?
- propane
- propanol ✓
- propene
- propanoic acid
- propyl propanoate
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Worksheet
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Lesson Details
Key learning points
- Reactions of an alkene happen at its functional group, C=C.
- Reactions of an alkene change it from an unsaturated to a saturated molecule.
- Larger alkenes have higher boiling points and are less flammable.
- Alkenes tend to burn with smoky flames due to incomplete combustion.
- Isomers are structures with the same molecular formula, but different arrangement of atoms in space.
Common misconception
The shortest alkene is one containing only one carbon atom.
Teach that alkenes contain the C=C bond and therefore the shortest alkene is ethene.
Keywords
Functional group - The functional group is the atom or group of atoms responsible for the way a compound reacts.
Unsaturated - Unsaturated compounds contain at least one carbon-carbon double covalent bond.
Saturated - Alkanes are saturated hydrocarbons as they contain only single bonds between carbon and hydrogen atoms.
Isomers - Isomers are structures with the same molecular formula, but different arrangement of atoms in space.
Alkenes - Alkenes are unsaturated hydrocarbons that contain the C=C functional group.
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