Starter quiz
- Sort the following alcohols into order of increasing chain length, starting with the shortest.
- 1⇔methanol
- 2⇔ethanol
- 3⇔propanol
- 4⇔butanol
- 5⇔pentanol
- What name is given to the atom or group of atoms responsible for the way a compound reacts?
- 'functional group' ✓
- Match the following homologous series with the correct functional group.
- alkene⇔C=C ✓
- alcohol⇔–OH ✓
- carboxylic acid⇔–COOH ✓
- ester⇔–COO– ✓
Identify the molecule shown in the image.- methene
- methane
- methanol
- ethene ✓
- ethane
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- Which experiment is used to indirectly measure the energy released from the combustion of different fuels?
- photosynthesis
- crystallisation
- distillation
- calorimetry ✓
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- Which of the following statements about alkenes are correct?
- alkenes contain a C=C double bond ✓
- alkenes are saturated molecules
- the simplest alkene is methene
- butene is an alkene containing 4 carbon atoms ✓
- the general formula of alkenes is ✓
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Exit quiz
- Which of the following is a test for unsaturation?
- Add sodium carbonate and test for carbon dioxide.
- Add hydrochloric acid and observe bubbling.
- Add bromine water and observe a colour change. ✓
- Add lithium hydroxide and test the pH.
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- Which of the following statements about chain length is correct?
- As chain length increases, more energy is released during combustion. ✓
- As chain length increases, the same energy is released during combustion.
- As chain length increases, less energy is released during combustion.
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- Sort the following alkenes into order of decreasing viscosity, starting with the most viscous.
- 1⇔pentene
- 2⇔butene
- 3⇔propene
- 4⇔ethene
- Which of the following colour changes, if any, will be observed when bromine water is added to an alkene?
- from colourless to orange
- from clear to orange
- from orange to colourless ✓
- from orange to clear
- remains orange
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Which of the following colour changes, if any, will be observed when bromine water is added to the molecule shown in the image?- from colourless to orange
- from clear to orange
- from orange to colourless
- from orange to clear
- remains orange ✓
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- Which of the following molecules will decolourise bromine water?
- C₂H₄ ✓
- C₂H₆
- C₃H₆ ✓
- C₃H₈
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A chemical test can identify the differences between alkanes and alkenes.
- Data from calorimetry and viscosity experiments can be used to predict the chain length of alkanes, alkenes & alcohols.
- As chain length increases, more energy is released during combustion.
- As chain length increases, the viscosity of alkanes, alkenes and alcohols increases.
Common misconception
Describing the colour change of bromine water with an alkene from orange to clear.
Coloured solutions can be clear if you can see through them. Colourless means it has no colour. Bromine water in the presence of an alkene changes from orange to colourless.
Keywords
Homologous series - A homologous series of organic compounds have the same general formula, and show similar chemical properties and physical property trends.
Functional group - The functional group is the atom or group of atoms responsible for the way a compound reacts.
Calorimetry - Calorimetry is an experiment that can be used to measure the energy released from a fuel.
Viscosity - Viscosity is how easily a liquid flows. The higher the viscosity, the less easily a liquid flows.
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