Group 2
- Created by: georgiemountford
- Created on: 17-09-19 09:01
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- Group 2
- Physical properties
- High melting and boiling points
- Form colourless compounds
- Form alkaline hydroxides
- Ionisation energy
- Part of s-block
- Reactivity increases down the group - each successive element has outer electrons in a higher energy level, larger atomic radius and more shielding.
- Reactions
- Oxygen: Produces ionic oxide XO. Redox.
- Water: Form hydroxides M(OH) and hydrogen gas. Redox.
- React more vigorously down the group.
- Dilute acids: Form salt and hydrogen gas. Redox.
- React more vigorously down group.
- Group 2 oxide + water: Forms water-soluble metal hydroxide.
- Solubility of hydroxides increases down group - releases more OH- ions = more alkaline solution.
- Uses of group 2 compounds
- Calcium hydroxide used as lime to reduce soil acidity.
- Magnesium hydroxide used to treat indigestion - neutralises excess stomach acid.
- Calcium carbonate used in building (limestone)
- Reacts with dilute acid in rainwater = erosion.
- Physical properties
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