CAIE A Level Chemistry 9701 · An introduction to organic chemistry
Ethane, , and ethene, , both contain only carbon and hydrogen atoms. In ethane each carbon atom is bonded to four other atoms; in ethene each carbon atom is bonded to three other atoms. Suggest why the bond angle around each carbon atom in ethene is larger than the bond angle around each carbon atom in ethane.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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