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PapaCambridge 上面有全科每届的pastpaper和markscheme。网址：https://papacambridge.com/home/index.html ...
These are video solutions for Paper 2 OCR (A) Chemistry A-level, June 2019 series. You can find the pdf of the model solutions, as well as the question paper and the mark scheme on ourOCR (A) Chemistry A-level Paper 2page.
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Papers 1 – 4 Chapter 1: Air and Water Chapter 2: Chemical Patterns Chapter 3: Chemicals of the Natural Environment Chapter 4: Material Choices Chapter 5: Chemical Analysis Chapter 6: Making Useful Chemicals Chapter 7: Ideas About Science ...