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Edexcel IGCSE Chemistry 2.1 Group 1 reactions with water

Practise Group 1 water-reaction questions by describing observations, naming products and linking alkaline solutions to indicators.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • State visible observations such as fizzing, movement, melting or flame colour in water.
  • Choose metal hydroxide and hydrogen as products of Group 1 reactions with water.
  • Link alkaline solutions to indicator colours such as universal indicator turning purple.

2.1 Group 1 reactions with water question 1

[Maximum number: 2]

The diagram shows the positions of some elements in part of the Periodic Table.

Na Al S Cl
K Xe
In

Table for Question 2.1 Group 1 reactions with water question 1 — Edexcel IGCSE Chemistry

A teacher adds a small piece of sodium to a glass trough containing water and universal indicator.

The universal indicator changes colour.
The equation for the reaction is

2Na( s)+2H2O(l)→2NaOH(aq)+H2( g)2 \mathrm{Na}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})

Explain the final colour of the universal indicator.

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