The newest 13 of 13 written questions. Open one to see it on the real paper.
State the flame test colour for potassium.
See it on the paper →State the flame test colour for potassium.
See it on the paper →The student does a flame test on the filtrate. A lilac flame is observed. Circle the cation (positive ion) in the filtrate. lithium copper(II) potassium sodium
See it on the paper →The student adds dilute nitric acid followed by aqueous barium nitrate to the filtrate. A white precipitate is observed. Identify the anion (negative ion) in the filtrate.
See it on the paper →Describe how to do a flame test on the blue solution.
See it on the paper →The blue solution gives a blue-green flame in the flame test. Tick(✓) the box to identify the cation present in the blue solution. lithium sodium copper( II ) potassium
See it on the paper →Suggest why the student cleans the flame test wire.
See it on the paper →Explain why the student thinks the sample of copper( II ) sulfate is not pure.
See it on the paper →Suggest why it is important to use a blue Bunsen burner flame rather than a yellow Bunsen burner flame in the flame test.
See it on the paper →The student does a flame test on a solution of the salt. The student observes a yellow-coloured flame. Identify the metal ion present in the salt.
See it on the paper →Hydrogen gas is given off when magnesium reacts with dilute hydrochloric acid. State a test for hydrogen gas and give the result of a positive test. test positive result
See it on the paper →• • • • • • • The student places the black powder F into a beaker of dilute sulfuric acid and heats it. She filters the mixture formed into two test-tubes. The liquid in the two test-tubes is solution G and is blue in colour. She adds aqueous sodium hydroxide to one test-tube of solution G. A pale blue precipitate form...
See it on the paper →State the identities of black powder F and blue solution G. Use the results in (a) and (b). identity of F identity of G
See it on the paper →Some candidates correctly identified potassium, but all answers were chosen with a similar frequency, implying that some candidates selected an answer at random.
— Examiner report, May/June 2023, 0653/61 Q2(e) (Cambridge)
Some knew that aqueous barium nitrate shows that a solution contains sulfate ions, but many incorrectly identified ‘nitrate’ as the anion.
— Examiner report, May/June 2023, 0653/61 Q2(f) (Cambridge)
Few candidates were able to describe how to carry out a flame test, often omitting to state that the Bunsen flame should be blue. Common mistakes included describing how to test for certain gases or simply stating that the solution should be put in a flame.
— Examiner report, May/June 2023, 0653/63 Q2(a)(i) (Cambridge)
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