Scheduled maintenance: Wednesday, February 8 from 10PM to 11PM PST
Upgrade to remove ads
Only $35.99/year

Group dos

Terms in this set (19)

Ionic equation with state symbols for calcium with water
Ca (s) + 2H2O (l)--> Ca2+ (aq) + 2OH-(aq) + H2(g)
state and explain the trend in ionisation energies down group 2
Decreases
- larger ions (more shells)
- weaker attraction between nucleus and electron to be lost
how would you determine the soluability of Ca(OH)2 in solution
- take a known volume of saturated solution
- evaporate the filtrate till dryness
- weigh the residue
thermal decomposition of ZnCO3 to zinc oxide
ZnCO3 --> ZnO + CO2
strontium hydroxide and H2So4
Sr(OH)2 + H2SO4 --> SrSO4 + 2H20
trend in atomic radius (2)
- increases
- more shells
trend in group 2 reactivity with water
Increases going down the group
why cant magnesium hydroxide be used to titrate acids
Magnesium hydroxide is insoluble
equation for Titanium chloride and mg
TiCl4 + 2Mg--> Ti + 2MgCl2
why shouldn't fires with a group 2 metal be extinguished with water
- forms hydrogen
- which is explosive
ionic equation for magnesium chloride and sodium hydroxide
Mg 2+(aq) + 2OH- (aq) --> Mg(OH)2 (s)
Salts containing the chromate(VI) ion are usually yellow in colour. Calcium chromate(VI) is soluble in water. Strontium chromate(VI) is insoluble in water, but will dissolve in a solution of ethanoic acid. Barium chromate(VI) is insoluble in water and is also insoluble in a solution of ethanoic acid. Describe a series of tests using solutions of sodium chromate(VI) and ethanoic acid that would allow you to distinguish between separate solutions of calcium chloride, strontium chloride and barium chloride. State what you would observe in each test.
Ca - no visible change with sodium chromate
Sr/Ba give yellow precipitate
Sr precipitate dissolves in ethanoic acid
equation for strontium chloride and sodium sulphate, state symbols
SrCl2 (aq) + Na2SO4 (aq) --> SrSO4 (s) + 2NaCl
why does calcium have a higher melting point than strontium
Ca has a smaller ionic radius
Stronger attraction between nucleus and delocalised electrons
ionic equation of barium and sulphate
Ba2+ + SO42- --> BaSO4
why didn't the student obtain a straight line
- as concentration increases the heat given out increases
- more successful collisions in a given time
- greater ROR
differences in the reaction of Mg with steam and Mg with water
- with water = Mg(OH)2 with steam = MgO
- slower with water faster with steam
Pure magnesium reacts completely with an excess of dilute sulfuric acid. The reaction of pure calcium with an excess of dilute sulfuric acid is very rapid initially. This reaction slows down and stops before all of the calcium has reacted.
why
Magnesium Sulphate is soluble and Calcium sulphate is insoluble
Calcium sulphate coats the surface
preventing further reactions
define rate of reaction
Change in concentration of product in unit of time
Sets found in the same folder