Is this textbook answer missing any bits? OCR A Chemistry

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swaus
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Question: explain why the bond angle around the carbon atom in an alkene is different to the bond angle around a carbon atom in alkane. (3 marks)

Answer: In an alkene, there are three bonding regions about the carbon atom. These repel each other equally resulting in a trigonal planar shape. In an alkane, there are four bonding pairs of electrons on the carbon atom. These repel each other equally resulting in a tetrahedral shape. The bond angle for a trigonal planar shape is 120(Degrees) while the bond angle for tetrahedral shapes are 109.5(Degrees).

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It doesn't mention how rigid double bonds are to negate electronegativity. Is this all I need to mention, because I feel that it doesn't explain it fully?
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lionike123
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That is all you have to say however for ocr a chemistry you do not say equally. You will say the alkene has three bonding regions which repel each other as far apart as possible resulting in a trigonal planar shape that is at 120 degrees. Then compare that to alkane.
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lionike123
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Key part is saying they repel each other as far apart as possible. Look at the some exam question answers.
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