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Chemistry
Inorganic
Group 2
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Cards (19)
Bonding in group 2
Metallic
How does Metallic bonding arise in G2 metals?
strong attraction between positive ions and
delocalised
electrons
Why does NaCl have a high melting point?
Ionic lattice
, strong
electrostatic attraction
between oppositely charged ions
Na+
and
Cl-
Atomic radius down G2
Increases, atom gets larger, more
shells
and shielding
MP down G2
Decreases down the group, atom gets larger, more shielding so weaker attraction between nucleus and
delocalised
electrons
IE down G2
Decreases down the
group
,
ions
get bigger, more shielding, weaker attraction between lost electrons
Solubility of hydroxides in G2
increases
down the group
What colour are ppt of G2 hydroxides?
white
What is magnesium hydroxide used for?
antacids
What is Calcium hydroxides used for?
neutralising
acidic
soil
How would Mg react if there was a coating of MgO on its surface?
react at different
rates
in a given tome
Solubility of G2 sulphates
Solubility decreases
down the group
What is Barium sulphate used for?
Barium meals
How can BaSO4 be ingested and is not toxic?
insoluble
Reagent to test for sulphate ions in G2
BaCl2
Why can't H2SO4 be used to test for sulphates?
contain
sulphide
ions, would react to give
white ppt
Reaction of Mg vs Ca with H2SO
MgSO4
fastest because more soluble in sulphuric acid.
CaSO4
slows down because CaSO4 forms on the surface of Ca, coating prevent contact with acid
How to measure the solubility of a substance in solution?
-evaporate
filtrate
till dryness
-weigh the
residue
-take known volume of solution
Barium hydroxide
dissolves easily in water, makes water very
alkali
because of hydroxide present
Ba(OH)2
+ aq -> Ba2+ + 2OH-
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