Group 2
- Created by: emma
- Created on: 22-03-14 21:42
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- Group 2
- Atomic radius
- Increases down the group
- More sheilding
- Electrons added to shells further from nucleus
- Increases down the group
- 1st ionisation
- Decreases down group
- Outer electrons further from nucleus and more sheilding
- Less electrostatic force of attraction between outer electron and nucleus
- Easier to knock electron off
- Less electrostatic force of attraction between outer electron and nucleus
- Outer electrons further from nucleus and more sheilding
- Decreases down group
- Melting and boiling points
- Decrease down group
- Atoms get bigger and the same number of electrons in outer shell are more spread out and further from nucleus
- Less attraction between outer electrons and nucleus
- Weaker metallic bonds
- Less attraction between outer electrons and nucleus
- Atoms get bigger and the same number of electrons in outer shell are more spread out and further from nucleus
- Decrease down group
- Reactions with water
- Increases in re-activity down group
- Less attraction between outer electron and nucleus so electrons more easily lost
- Mg(s)+H2O(g)= MgO(s)+ H2(g)
- White precipitate
- Ca(s)+ 2H2O(l) = Ca(OH)2(s) + H2(g)
- Cloudy solution
- Sr(g)+2H2O= Sr(OH)2(aq)+ H2(g)
- Colourless solution
- Ba(g)+2H2O(l)= Ba(HO)2(aq)+H2(g)
- Colorless solution
- Increases in re-activity down group
- Solubilities
- Hydroxieds
- Solubility increases
- Mg(OH)2 used to neutralise excess stomach acid
- Ca(OH)2 netralise acidic soil
- Solubility increases
- Sulphates
- Solubility decreases
- Barium sulphate is insoluble and used as a barium meal
- Ba2+ ions could not get into blood stream as held in BaSO4 solid
- Hydroxieds
- Test
- Acidify with HCl to remove impurities
- Add barium chloride
- If sulphate ions are present a white precipitate forms
- If testing for baruim ions add Na2SO4 or MgSO4 or just add H2SO4 at beginning a white precipitate forms
- Not H2SO4 as it contains sulphate ions
- Add barium chloride
- Acidify with HCl to remove impurities
- Atomic radius
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