Chemistry > A-Level Question Paper > OCR A LEVEL JUNE 2022 CHEMISTRY A PAPER 3 QUESTION PAPER Download For Guaranteed A (All)
OCR A LEVEL JUNE 2022 CHEMISTRY A PAPER 3 QUESTION PAPER Download For Guaranteed A
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2 Answer all the questions. 1 These 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. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2] (ii) 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. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [1] © OCR 2022 3 (b) Brass is an alloy of copper and zinc. The mass spectrum of a sample of brass is shown below. Relative abundance 60 61 62 63 64 65 m/z 66 67 68 69 70 The peaks at m/z = 63 and m/z = 65 are from the 63Cu and 65Cu 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? Cu = ............. % Zn = % [1] (ii) Calculate the relative atomic mass of zinc in the sample of brass. Give your answer to 2 decimal places. relative atomic mass = [2] © OCR 2022 Turn over 4 (c) The structure of an organic compound is shown below. The protons are in four different environments, which are labelled 1–4. [Show More]
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