Inorganic I - Group 2 metals Flashcards
What is the trend in atomic radius in group II?
It increases down the group due to increased electron shells.
What is the trend in reactivity in group II?
It increases, as increased shielding makes it easier to lose electrons.
What is the trend in reactivity down group 2?
It decreases down the group due to a greater atomic radius and increased shielding.
What is the trend in melting points down group 2?
It decreases as larger molecule’s attractive forces must act over a greater distance.
How does group 2 react with water?
In a redox reaction to produce a metal hydroxide and hydrogen.
Mg + 2H2O >Mg(OH)2 + H2
Give the equation when magnesium reacts with steam.
Mg + H2O → MgO + H2
Which observations can be made when magnesium reacts with steam?
Magnesium burns with a bright white flame and a white powder forms.
What is the trend in the solubility of group 2 hydroxides?
Solubility increases down the group.
What are the uses of magnesium hydroxide?
In medicine as an antacid, and in agriculture to neutralise acidic soil.
What is the trend in the solubility of group 2 sulfates?
Decreases down the group.
What is barium sulphate used for?
Barium sulphate is insoluble so can be used as a medical tracer ( barium meal )
What is barium chloride used for?
To test for sulfate ions. Forms a white precipitate if present.
Ba2+ + SO4 2- > BaSO4
How is magnesium used in metal extraction?
Used to extract titanium from titanium chloride.
TiCl4 + 2Mg > 2 MgCl2 + Ti
