Group 2 Metals Flashcards
Trend in atomic radius group 2
- Increases
- more shells
- more shielding
Trend 1st ionisation energy group 2
- Trend decreases
- more shells
- more shielding
- weaker forces of attraction from nucleus to electron in outer shell
General trend in melting point group 2
- general decrease
- weaker METALLIC BONDING
- as metal IONS are bigger
- so lower melting point
- weaker forces of attraction b/w positive ion and delocalised electrons
Group 2 reactivity
Becomes more reactive down the group
- metals react - lose two outer shell electrons
- down group, atoms become bigger and there is more shielding
- weaker forces of attraction between nucleus and outer shell electrons and so the outer shell electrons are more easily lost
What does group 2 and water create
Metal Hydroxide and hydrogen
Why does reactivity down group 2 increase
- metals lose two outer shell electrons
- atoms become bigger
- more shells; more shielding
- weaker forces of attraction between nucleus and outer shell electrons so outer shell electrons are more easily lost
Magnesium and water
- Observation
- Equation
Calcium and water
- Observation
- Equation
Sr and water
- Observation
- Equation
Barium and water
- Observation
- Equation
Two types of reactions with magnesium
- Water in redox reaction
2. Steam
Magnesium with steam
Solubility of hydroxides
More soluble going down
Solubility of sulphates
Less soluble going down
Uses of Barium sulphate
Medical: used for x-ray for the digestive system
Uses of magnesium hydroxide
Medicinal: used as an antacid (gaviscon)
Use of calcium hydroxide
Neutraliser for acidic soil caused from acid rain
Use of calcium carbonate
Tiles, Rennie
Uses of calcium oxide
Flue gas desulfurisation with sulfur to make gypsum (plasterboard)
Uses of magnesium
Metal extraction
Why is the insolubility of barium sulphate useful
Metal extraction and what type of reaction is it?
