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GCSE Chemistry Past Paper Question

my question is from a past paper, please give me a model answer
"Discuss what is meant by isomerism and alkenes using compounds with the molecular formulae C4H10 and C4H8 to illustrate your answer

Link to Past Paper - https://www.physicsandmathstutor.com/pdf-pages/?pdf=https%3A%2F%2Fpmt.physicsandmathstutor.com%2Fdownload%2FScience%2FGCSE%2FPast-Papers%2FWJEC-Wales%2FUnit-5H%2FJune%25202019%2520QP%2520-%2520Unit%25205%2520(H)%2520WJEC%2520Science%2520GCSE.pdf

Link to Mark Scheme - https://www.physicsandmathstutor.com/pdf-pages/?pdf=https%3A%2F%2Fpmt.physicsandmathstutor.com%2Fdownload%2FScience%2FGCSE%2FPast-Papers%2FWJEC-Wales%2FUnit-5H%2FJune%25202019%2520MS%2520-%2520Unit%25205%2520(H)%2520WJEC%2520Science%2520GCSE.pdf

Reply 1

TypicalNerd

Original post by Gerhman

Here is a model answer to that question and I’d like you to give it a mark to see which criteria on the mark scheme you think it fits and explain why (since model answers are good for understanding where students go wrong or miss key points in addition to learning how to structure them):

“Isomers are molecules with the same chemical formula, but a different arrangement of the atoms in each molecule.

For example, C4H8 could represent but-1-ene (CH2=CHCH2CH3) or but-2-ene (CH3CH=CHCH3). Furthermore, C4H10 could represent either a straight-chain isomer like butane (CH3CH2CH2CH3) or a branched-chain isomer like (CH3)3CH.”