Topic 8B Groups 1 and 2
Use this landing page to move between the seven Groups 1 and 2 revision pages of Topic 8. Each card links to a focused page with inline checks, worked examples and exam-style FAQs.
Choose a Groups 1 and 2 Page
The s-block metals are the clearest example of trends down a group. These pages explain the trends in atomic radius, ionisation energy and reactivity, the reactions of the elements and their oxides, hydroxides and carbonates, the solubility and thermal stability patterns, flame colours and the tests for ions, and finish with titration calculations and measurement uncertainty.
Key idea: Almost every explanation in this section is about the size and charge of the metal ion: it decides ionisation energy and reactivity, how strongly the cation polarises a carbonate or nitrate ion, and how the solubilities change down the group.
Trends Down Groups 1 and 2
The trends down Group 2 and Group 1: atomic radius, ionisation energies, melting points and the increase in reactivity down the group.
Start revisingReactions of the Group 1 and 2 Elements
The reactions of the Group 2 and Group 1 elements with oxygen, chlorine, water, steam and dilute acids, with equations, observations and redox analysis.
Start revisingOxides, Hydroxides and Carbonates
Group 2 oxides, hydroxides and carbonates: reactions with water and acids, pH trend, and uses of Ca(OH)₂, Mg(OH)₂ and CaCO₃.
Start revisingSolubility Trends and the Sulfate Test
Group 2 solubility trends: hydroxides and sulfates, Mg(OH)₂ and BaSO₄, the acidified barium chloride test for sulfate ions and barium meals.
Start revisingThermal Stability and Flame Colours
Thermal stability of Group 1 and 2 nitrates and carbonates, polarisation by the cation, the experiments, and flame colours explained by electron transitions.
Start revisingTests for Ions
Tests for carbonate, hydrogencarbonate, sulfate, halide and ammonium ions, with ionic equations and the order of tests on an unknown.
Start revisingTitrations and Measurement Uncertainty
Titration calculations, concordant titres, concentrations in mol dm⁻³ and g dm⁻³, and estimating and minimising measurement uncertainty.
Start revisingHow to Use These Pages
Work through the trends first so that the reasoning is secure, then the reactions of the elements and their compounds. The solubility, thermal stability and tests pages are where the observations live; learn them with the equations that explain them.
Exam focus: Give observations as well as equations: fizzing, a white precipitate, a cloudy suspension, a brown gas or a coloured flame are marks in their own right.
Copyright notice: This revision page, including its written explanations, layout and teaching sequence, is produced for Online Learning System by Dr. Mohammed Al-Fatah. It is intended for student revision and may not be copied, redistributed or republished without permission.
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