OCR A LEVEL JUNE 2022 CHEMISTRY A PAPER 3 QUESTION PAPER

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A Level Chemistry A H432/03 Unified chemistryThese questions are from different areas of chemistry. (a) Ammonia, NH3, and ammonium nitrate, NH4NO3, are compounds of nitrogen. (i) The boiling point ... of NH3 is –33 °C. The boiling point of NH4NO3 is 210 °C. Explain why there is a large difference in boiling points.Two students discuss the oxidation numbers in ammonium nitrate, NH4NO3. One student claims that the two nitrogen atoms have the same oxidation number. The other student disagrees and claims that the nitrogen atoms have different oxidation numbers. Explain with reasons which student is correct.Brass is an alloy of copper and zinc. The mass spectrum of a sample of brass is shown below.The peaks at m/z = 63 and m/z = 65 are from the 63 Cu and 65 Cu isotopes of copper. The remaining four peaks are from isotopes of zinc. (i) What are the percentage compositions of copper and zinc in the brass sample?The structure of an organic compound is shown below. The protons are in four different environments, which are labelled 1–4.Glycine, H2NCH2COOH, is an α-amino acid. (i) Glycine reacts with NaOH to form the salt H2NCH2COONa. Glycine reacts with HCl to form the salt HOOCCH2NH3Cl. The salts have different H–N–H bond angles. State the different H–N–H bond angles and explain why they are different. [Show More]

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OCR A LEVEL JUNE 2022 CHEMISTRY A PAPER 1,PAPER 2 AND PAPER 3 QUESTION PAPER

1 An aqueous solution contains a mixture of chloride, bromide and iodide ions. AgNO3(aq) is added to this mixture, followed by an excess of dilute NH3(aq). The resulting mixture is then filtered. Whi...

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