Group 2 and Group 7 Metals Flashcards
Describe to me the solubility of hydroxides
Solubility increases down the group
What is magnesium hydroxide used for
Antacid or to neutralise acidic solids
What is the solubility of sulfates
Decreases in solubility down the group
How is titanium extracted
Magnesium is used in the extraction of titanium via displacement reaction
flue gas removal
CaO+2H2O+SO2—–>CaSO3 +2H2O
Calcium oxide reacts with sulfur dioxide to remove it from factory pollutants this forms calcium sulfite and water
Group 2 atomic radius patterns
Atomic radius inc
Group 2 reactivity
Shielding inc going down group so outer e easier to loose so group 2 inc on reactivity
whathappens to an atiom when Ionisation energy decreases
Greater atomic radius inc shielding so less ionising energy
Group 2 melting point trends
Dec down group. Attractive forces act over larger distancesso they are weaker
Atomic radius trend for g7
Inc going down group
Reactivity for g7
Reactivity decreases
Boiling point for g7
Simple covalent molecules
heldtogether by van der waals intermolecular force inc as ar inc so strength of vdw incso bp inc
Oxidising power for g7
Decreases going down group 7
Will iodine displace any halide ions
No ioneine does not displace any halide ions
Halide ions reducing agent trend going down the group
Reducing agent power increases going down the group the greater the reducing power the longer the reaction
Give me the reactions between fluoride and chloride ions
NaF + H2SO4 —> NaHSO4 + HF
NaCl + H2SO4 —> NaHSO4 + HCl
Bromide ions reaction
NaBr +H2SO4 —>NaHSO4 +HBr
2HBr +H2SO4 —> Br2 + SO2 +2H2O
Iodide ions reactions
NaI+H2SO4—->NaHSO4 +HI
2HI +H2SO4 —-> I2 + SO2 + 2H2O
6HI + SO2 —-> H2S + 3I2 + 2H2O
how is SO4 2-
tested for
Tested for using BaCl2 forms a white precipitate
Hydroxide test
red litmus turns blue
If a carbonate test
Add hcl, will fizz CO2 gas given off collect gas bubble through like water will turn cloudy
Calcium flame test result
Brick red
Strontium flame test result
Red
Barium flame test result
Pale green
How to show calcium hydroxide is soluble
Take a known volume of the saturated solution
Evaporate the filtrate to dryness
Weigh the residue
Using concentrated sulphuric acid to test for F- ion result
Steamy acidic fumes (HF produced)
Cl- ion H2SO4 test result
Steamy acidic fumes of HCl
Br- H2SO4 test result
Steamy acidic fumes contaminated with brown bromine vapour
I- ion H2So4 positive result
Some steamy fumes (of HI), but lots of purple iodine vapour (plus various red colours in the tube)
