Group 2 elements
- Created by: Waheeda Ratyal
- Created on: 25-04-14 20:35
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- Group 2-Alkaline Earth Metals
- Reactions with H20
- Be does not react with H20
- Ca, Sr & Ba all react with cold H20 vigourously to form H2(g) through the bubbles, a ppt is also formed which is the hydroxide
- The precipitate becomes more soluble down the group, this why you see less precipitate down the group
- X(s)+2H20(l)->X(OH)2(aq/s) +H2
- reactivity of the group increases down the group
- easier to form a positive ion, as less energy is needed and the ionisation energy decreases down the group= less activation energy & quicker reaction
- Mg reacts in steam to produce white MgO and H2
- Physical properties
- Atomic radius increases down the group
- Ioniisation eneergy decreases down teh group
- decrease in electronegativity down the group
- generally weak melting & boiling points
- Atomic radius increases down the group
- Reactivity
- When metals react to form oxides, hydroxides, metal ions are formed
- Reactions with O2
- metals burn in O2 to form a simple metal oxide
- 2X(s)=O2->2XO(s)
- Reactions with H20
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