Group 2 - The Alkali Earth Metals Flashcards
are group 2 metals reactive
yes
how do we make group 2 metals useful in manufacturing and industry
their compounds
which element behaves differently in group 2 and why
Beryllium (Be)
due to its small size
what’s the physical trend in atomic radius down group 2 and why
increases
*because number of principle energy levels increase
*more shielding
- weaker attraction between nucleus and outer electron
what’s the physical trend in first ionisation energy down group 2 and why
decreases
*because number of principle energy levels increase
*more shielding
- weaker attraction between nucleus and outer electron
what’s the physical trend in melting point down group 2 and why
decreases
- size of ion increases
*weaker electrostatic force of attraction between delocalised electrons and positive metal ions
what happens to group 2 elements reactivity down the group and why
they get more reactive
*because the atom gets larger
*there’s more shielding as you go down
*the outer electron is removed from a
higher principle energy level
*weaker attraction between nucleus and outer electrons
what happens to reactions down group 2
they get more rigorous
what forms when group 2 metals and WATER react
a metal hydroxide and hydrogen gas
Mg + 2H2O —-> Mg(OH)2 + H2
(s) (l) (s. (g)
what are 3 observations when group 2 metals react with water down the group
more vigorous fizzing
less precipitate formed
reactions warming up quicker
what’s the difference between STEAM and WATER when MAGNESIUM reacts with it
magnesium reacts much quicker with steam than water
the products when magnesium reacts with steam or water are different
this is the equation with steam
Mg + H2O ——> MgO + H2
(s) (g) (s) (g)
what is observed when magnesium reacts with steam
bright white flame
and white solid
what happens to solubilities of group 2 metal hydroxides down the group
and so what happens to the pH?
solubilities of group 2 metal hydroxides increase down the group (HAM)
the pH increases because as we increase the solubility, the number of hydroxide ions in the solution increases making the solution more alkali
what happens to the solubility of group (II) SULFATES down the group
solubility of sulfates decreases down the group ( SALAD)
what is use for Mg
Mg is used in the extraction of Titanium from its ores
