Specification Point 2.1:
Understand how the similarities in the reactions of these elements with water provide evidence for their recognition as a family of elements

How Alkali Metals React with Water

Alkali Metals: Group 1 metals that includes: Lithium, Sodium, Potassium, Rubidium, Caesium and Francium.

Group 1 metals Periodic Table, CIE IGCSE Chemistry

Similar Reactions with Water:

  • Group 1 metals will react similarly with water as they are a family of elements called alkali metals
  • They will react vigorously with water to produce an alkaline metal hydroxide and hydrogen gas.
Specification Point 2.2:
Understand how the differences between the reactions of these elements with air and water provide evidence for the trend in reactivity in Group 1

Trend of Reactivity

Trend of Reactivity in Group 1 Metals:

  • The Reactivity of Group 1 Metals will increase down the group
  • As you go down the group, the observations during the reaction with air and water becomes more vigorous

Reaction with Air:

Group 1 metals reactions w air, Edexcel IGCSE Chemistry

Reaction with Water:

Group 1 metals reactions with water, Edexcel IGCSE Chemistry
Specification Point 2.3:
Use knowledge of trends in Group 1 to predict the properties of other alkali metals

Predicting Properties

Properties of other Alkali Metals (Rubidium, Caesium and Francium):

  • As the reactivity of alkali metals increases down the Group, Rubidium, Caesium and Francium will react more vigorously with air and water
  • Lithium will be the least reactive at the top and Francium will be the most reactive at the bottom
  • Francium is rare and radioactive so is difficult to confirm predictions

Predicted Reaction with Water:

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.