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AQA Specimen Paper 1 Q10
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![26 10 Table 5 shows observations of changes from some test-tube reactions of aqueous solutions of compounds Q, R and S with five different aqueous reagents. The initial colours of the solutions are not given. Na2CO3 white precipitate HCl (conc) no change observed white precipitate, bubbles of a gas brown precipitate, bubbles of a gas no change observed yellow solution [6 marks] Table 5 AgNO3 + HNO3 BaCl2 + HCl no change observed pale cream precipitate no change observed white precipitate NaOH white precipitate white precipitate, dissolves in excess of NaOH white precipitate no change observed brown precipitate 1 0 Identify each of compounds Q, R and S. . 1 You are not required to explain your answers. Identity of Q Identity of R Identity of S Barcode Typesetter code<br />
1 0 27 . 2 Write ionic equations for each of the positive observations with S. [4 marks] END OF QUESTIONS Barcode Typesetter code Turn over <br />](https://learnah.org/wp-content/uploads/2018/08/Specimen_QP_-_Paper_1_AQA_Chemistry_A-Level_10-0-1.jpg)
![Marking guidance Q is calcium or magnesium bromide R is aluminium chloride S is iron(III) sulfate Ba2+ + SO4 [Fe(H2O)6]3+ + 3OH Fe(H2O)3(OH)3 + 3H2O 2[Fe(H2O)6]3+ + 3CO3 2Fe(H2O)3(OH)3 + 3H2O + 3CO2 [Fe(H2O)6]3+ + 4Cl [FeCl4] + 6H2O 2 BaSO4 2 Question 10.1 10.2 Mark 1 1 1 1 1 1 AO AO3 1b AO3 1b AO3 1b AO3 1b AO3 1b AO3 1b AO1a AO1a AO1a AO1a 1 1 1 1 MARK SCHEMEA-level ChemistrySpecimen paper 1 Comments Mark this question independently 15 of 15<br />](https://learnah.org/wp-content/uploads/2018/08/Specimen_MS_-_Paper_1_AQA_Chemistry_A-Level_10-1.jpg)