Group 2

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What happens to atomic radius as you go down the group?
It increases
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Why?
The atoms have more shells of electrons making the atom bigger
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What happens to the melting point as you go down the group?
It decreases
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Why?
The metallic bonding weakens as the atomic size increases. this is because the distance between the positive ions and delocalized electrons increase therefore the electrostatic forces between the positive ions and the delocalized electrons weaken
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What happens to the 1st ionsiation energy as you go down the group?
They are held more weakly because they are successively further from the nucleus in addition shells
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What else?
The outer shells become more shielded from the attraction of the nucleus by the repulsive force of inner shell electrons
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What happens to the reactivity in group two metals?
It increases as you go down the group
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What happens when Mg burns?
It produces a bright white flame
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What happens when Mg reacts with steam?
It produces magnesium oxide and hydrogen
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What happens when Mg reacts with warm water?
It produces magnesium hydroxide
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What do other group two metals react with?
Cold water
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The hydroxides produced make the water?
alkaline
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What would one person observe?
fizzing, metal dissolving, solution heating up and with calcium a white precipitate appearing
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What happens with Group II hydroxides?
They become more soluble down the group
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What is magnesium hydroxide used as in medicine?
Neutralise excess acid in the stomach and to treat constipation
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What is the solubilty of barium like?
It would dissolve easily in water and make the solution strongly alkaline
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What happens to group II sulphates?
They become less soluble down the group
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What is the ionic equation for the formation of SrSO4?
Sr+2 + SO42- ----> SrSO4
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How is BaSO4 used in medicine?
The barium absorbs the Xrays and so the gut shows up on the X-ray image
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How would you test for sulphate ions?
BaCl2 solutions acidified with hydrochloric acid
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Other cards in this set

Card 2

Front

Why?

Back

The atoms have more shells of electrons making the atom bigger

Card 3

Front

What happens to the melting point as you go down the group?

Back

Preview of the front of card 3

Card 4

Front

Why?

Back

Preview of the front of card 4

Card 5

Front

What happens to the 1st ionsiation energy as you go down the group?

Back

Preview of the front of card 5
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