The newest 12 of 12 written questions. Open one to see it on the real paper.
State the colour change observed when water is added to anhydrous cobalt(II) chloride.
See it on the paper →A chemical test for water is the use of anhydrous cobalt( II ) chloride. State the colour change observed for a positive test. from to
See it on the paper →A chemical test for water is the use of anhydrous cobalt( II ) chloride. State the colour change observed for a positive test. from to
See it on the paper →Describe a chemical test for water. State the colour change observed. test
See it on the paper →Describe a chemical test for water. State the colour change observed. test
See it on the paper →Describe a chemical test for the presence of water in a sample of exhaust gases and state the observations for a positive result. test positive result
See it on the paper →Used as a chemical test for water.
See it on the paper →Describe a chemical test for water and give the positive result. test positive result
See it on the paper →Candidates were unfamiliar with the chemical tests for water. Some suggested using an indicator, others named other chemical tests such as limewater, biuret reagent and bromine water.
— Examiner report, May/June 2025, 0654/32 Q6(b)(ii) (Cambridge)
Candidates were unfamiliar with the chemical tests for water. Some suggested using an indicator, others named other chemical tests such as limewater, biuret reagent and bromine water.
— Examiner report, May/June 2025, 0654/33 Q6(b)(ii) (Cambridge)
Very few candidates were able to describe either of the two possible chemical tests for the presence of water.
— Examiner report, February/March 2025, 0654/32 Q7(a)(iv) (Cambridge)
Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.
Fig. 8.1 shows what happens when a student tests a gas to check that it is hydrogen. burning splint substance on inside of the test-tube pop Fig. 8.1 Describe a chemical test the student uses to show that the substance in the test-tube is water. test result
See it on the paper →The student mixes the drops of the colourless liquid that form inside the gas jar with anhydrous copper sulfate. Describe the colour change he observes if this liquid is water. from to
See it on the paper →Describe how the teacher shows that the reaction between anhydrous copper sulfate and water is reversible.
See it on the paper →Which row describes the colour changes when water is added to anhydrous copper(II) sulfate and to cobalt(II) chloride?
See it on the paper →