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gcse chemistry

are the brackets to show a repeating unit curved or square?
thank you

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Original post by jajahjhajhsja
are the brackets to show a repeating unit curved or square?
thank you
Look at the image in https://www.savemyexams.com/igcse/chemistry/cie/23/revision-notes/11-organic-chemistry/11-3-polymers/11-3-2-addition--condensation-polymers/

It is a bit curved at the end.

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