Group 2 Flashcards
(25 cards)
What happens to the atomic radius down group 2
increases
Adding electron shells
What happens to the first IE
decreases
Extra shells
More shielding
Weaker attraction between nucleus and outer electrons
Easier to remove outer electron so less energy
What happens to melting point
decreases
- size increases
- no of electrons remains same
-and nuclear charge
- larger ions means the distance between postiive nuclei in metal ions and delocalised is greater
-Weakens FOA
- easier to break bonds
What do group 2 form with water
bases tof rom metal hydroxides
What happens to the reactivity
Increases with water
- no reaction iwth B
Why does reactivity increase in water
- get larger
- futher from nucleus
-easier to remove and hence more reactive
-more shielding
How to magnesium react with water
- Reacts slowly with cold water
- More vigorously with steam
- Producing MgO inseatd of hydroxide
Solubility with sulfates
becomes less soluble
2 charges
Solubility of Hydroxides
becomes more soluble,e
- 1 single charge
How to test for sulfates
- Add hcl to remove any carbonates in giving false result
- Add BACL
3 white ppt
Examples of neautralisation of group2 compounds
Acidic soils - neutralise acidic soils
- antacids - mgOh neutralises stomach acid
Ionic equaltion for neautralisaation
h+ + oh- -h2o
What is barium meal
Patient drinks suspension
Coats the lining of soft tissues
C rays absorbed by barium sulfate so will show up on it
Will show digestive tract
How to exctract titanium
1.Titanium ore is converted to Ticl4 by heating with carbon and chlorine gas
2. Passed through fractional distiallatio colium to increase purity
3. Reduced using magniesum in 100c frnace
4. Ticl4+2mg-Ti +2mgcl2
removal of SO2
- Wet scrubbing inolved dissoling calcium caronate or oxide in wayer and spraying acidic SP2
- Forms calcium sulfite
Equation of wet scrubbin
CaCO3 +2H20 +SO2 - CaSO3 + 2H2O + CO2
Reaction of magnesium with cold water
Mg + 2H2O - MG (OH) 2 + H2
Reaction of magnesium with steam
Mg + H2O - MgO +H2
What forms when barium chloride tests for sulfate ions
- White ppt is formed
Ionic equation of testing for sulfate ions with bacl2
Ba2+ + SO42- - BaSO4 (s)
What reaction happens when magnsium is used in the ectraction of titanium
displacement
Eqaution for titanium extraction
TiCl4 + 2Mg - 2MgCl2 + Ti
What is flue gas removal
when calcium oxide reacts with sulfur diozide to remove it from factory pollutatns and prevent it being released into atmsohphere.
This forms calcium sulfite and water
Example of flue gas removal
CaO + 2H2O + SO2 - CaSO3 + 2H2O
