Chemistry 9701/43 Oct Nov 2018 | Cambridge AS Level Past Papers With Mark Scheme

The file you uploaded appears to be a series of structured chemistry questions from the Cambridge International A-Level Chemistry Paper 4 exam, November 2018. The topics covered in this document include:

1. Gas Chromatography: Identifying compounds in a mixture based on their retention times, and calculating the percentage by mass of a compound in a mixture based on peak areas.
2. Mass Spectrometry: Determining isotopes responsible for peaks in mass spectra and identifying molecular ions in bromochloromethane.
3. Organic Reactions: Drawing reaction mechanisms, such as the addition of hydrogen bromide to methylpropene, and explaining product distributions.
4. Partition Coefficient: Understanding the partitioning of compounds between two solvents and calculating the mass of a compound extracted.
5. Coordination Chemistry: Understanding bidentate ligands, drawing stereoisomers of complex ions, and calculating solubility products.
6. Transition Metals and Reactions: Identifying unpaired electrons in transition metals, constructing equations for reactions like the decomposition of potassium manganate(VII), and explaining color origins in transition metal complexes.
7. Acid-Base Chemistry: Understanding buffer solutions, acid-base equilibria, and calculating pH changes and ion concentrations.
8. Polymer Chemistry: Analyzing the formation of polyhydroxyamides, biodegradability of polymers, and reaction mechanisms.
9. Electrochemical Cells: Writing half-equations for reactions in methanol-oxygen fuel cells and calculating the cell potential.

These questions cover a wide range of chemistry concepts including organic, inorganic, thermodynamics, and electrochemistry. Let me know if you need assistance with any specific part of this document!