Group 2 Flashcards
Elcectron configuration of group 2 metals
Noble gas xs2
Eg Be= He2s2
Do group two metals lose or gain electrons
Lose 2 electrons to form a 2+ ion
Are group 2 metals oxidising or reducing agents
Very good reducing agents
What is the trend in reactivity down the group
Explain
They get more reactive going down the group
Atomic radius increases, more shielding ,despite increase in nuclear charge the electrons are less attracted to the nucleus so less energy required to remove electrons
What do group 2 metals exist as
Compounds
How do group 2 metals react with oxygen
What kind or reaction is this
They form metal oxides
Redox- metal is oxidised, oxygen is reduced
What is formed when any group 2 metal is burnt in oxygen
A white solid
Describe how the reaction of group 2 metals with oxygen change down the group
They get more vigorous
How do group 2 metals react with water
What reaction is this
From Mg downwards they react to form a metal hydroxide and hydrogen
Redox- metal oxidised half the hydrogen in the water is reduced
Describe what you would see when a group 2 metal reacts with water
Alkaline solution
Bubbles of colourless gas
Describe the change in reaction of group 2 metals and water down the group
More vigorous down the group
Metal hydroxides get more soluble down the group: Mg amd Ca form a white solid
What is formed when a group 2 metal reacts with an acid
What kind of reaction is it
All form a metal salt and hydrogen
Redox metal is oxidised hydrogen is reduced
What is seen when a group 2 metal reacts with a acid
Solution or suspension of metal salt and bubbles of colourless gas
Reaction is more vigorous as you go down
What happens if a group 2 oxide is soluble in water
Equation
The oxide ion released into the water reacts with a water molecules to form a hydroxide ion which creates a metal hydroxide
MO+h2o —-> M(oh)2 (aq/s)
Is BeO and Be(OH)2 soluble or insoluble
Insoluble
Trend in group 2 metal oxides and hydroxides solubility from Mg
Solubility increases down the group
Describe the trend in alkalinity as you go down group two hydroxides and oxides from Mg
Solubility increases
pH increases
Alkalinity increases
What is lime and how do farmers use it
Properties
Calcium hydroxide
Neutralises any acid
Low solubility in water so won’t dissolve readily in rain water and be lost in water courses
What does calcium carbonate do
Also neutralises acids and is completely insoluble
Uses of group 2 in medicines
Group 2 bases (hydroxides oxides and carbonates) neutralise acids so used in indigestion tablets
