Inorganic Chemistry Flashcards
Group 2 reactions with water
M(s) + 2H2O(l) -> M(OH)2(aq) + H2(g)
Increase in reactivity going down the group
Solubility of Group 2 hydroxides
Increase in solubility going down the group
Solubility of Group 2 sulfates
Decrease in solubility going down the group
Test for sulfate ions
Solution acidified with nitric or hydrochloric acid (to remove carbonate ions)
Barium chloride solution is added under test
A white precipitate of barium sulfate will form if sulfate ions present
Magnesium hydroxide
An antacid
Calcium hydroxide
Neutralise acidic soil
Magnesium sulfate
A laxative
Calcium sulfate
Plaster casts
Barium sulfate
Contrast medium for x-rays
Barium carbonate
Rat poison
Extraction of titanium
TiO2 + 2C + 2Cl2 -> TiCl4 + 2CO
TiCl4 + Mg -> 2MgCl2 + Ti
Batch process, high temperature, argon atmosphere
The Halogens
F2: yellow gas, Cl2: green gas, Br2: brown liquid, I2: black solid
Trend in bond energy of Group 7
Bond energy decreases down the group
However fluorine F-F bonds are unexpectedly weak
Oxidising ability of Group 7
Oxidising ability decreases going down the group
More electrostatic attraction and less shielding so easier to gain electrons
Reducing ability of Group 7
Reducing ability increases going down the group
Easier to lose electrons
