logo

Cambridge IGCSE Combined Science practice

Paper 3 structured question: Water

Try the question first, then check the answer and practise the same topic again.

Attempt questionWater revisionRevise the key idea

At a glance

3

Paper

4

Marks

Topic

Water

Exam-style question

Try this first

Paper 3Theory (Core)4 marks

Chemical tests for water identification

Description

Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used to identify the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when water is present.

  1. a

    Explain the chemical tests used to identify water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate.

    Aim for approximately 4 distinct marking points.

    [4]

0 of 1 part answered

Answer every part before opening the mark scheme.

Common mistake

No common mistake is linked to this question yet.

Related flashcards

Flashcard 1 of 6

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 4 attempted

Paper 3 structured question: Water

Paper 3Theory (Core)2 marks

Description

Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used to identify the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when water is present.

  1. a

    Describe the color changes observed when using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate to test for water.

    Aim for approximately 2 distinct marking points.

    [2]