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Edexcel IGCSE Chemistry 2.2 Group 1 reactivity trend

Practise Group 1 trend questions by comparing observations for lithium and potassium, then linking the data to increasing reactivity.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Compare potassium with lithium using faster fizzing, melting or a lilac flame.
  • Use observation tables to deduce that Group 1 reactivity increases down the group.

2.2 Group 1 reactivity trend 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 2.2 Group 1 reactivity trend 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})

The teacher repeats the experiment with potassium instead of sodium.

Give one similarity and one difference observed with potassium.
similarity
difference

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