periodicity & grp 2 Flashcards
periodicity meaning
pattern in properties across a row which is repeated in each row
trend of solubilty of group 2 sulfates from mg to ba
decreases
a reagent that can be used to test the presence of sulfate ions
barium chloride
2 observations when mg reacts with steam
glow and white solid produced
formula of the hydroxide of the element from mg to ba most soluble in water
BA(OH)2
a use of magnesium hydroxide in medicine
antacid
describe the solubility from mg(oh) to ba(oh)
increases
why sulfuric acid shouldnt be used to acidfy barium chloride
bc sulfuric acid contains SO4 2- ions
simplist ionic equation for the reaction when acidfied barium chloride solution is added to a soluation containing sulfate ions
Ba2+ + SO42- ->BaSo4
least soluble hydroxide from mg to ba
mg(OH)2
why is magnesium sulfate easy to seperate from titanium
because mgso4 is soluble in water and ti is filtered off
why is barium swallow safe to swallow
because baso4 is insoluble
what oxides does acid rain form
nitrogen and sulfur
what is calcium carbonate used for
adult indigestion remedies
what can calcium oxide and calcium carbonate be used in
flue-gas desulphurisation
what can calcium hydroxide be used for (slaked lime)
used in agriculture to increase the pH of soils by removing acids
what is the medicinal use of magnesium sulfate (MgSo4)
externally: relaxant
internally: laxative, lowers blood pressure
what properties of titanium make it preferable to use for this application compared to steel
low density, strong, resistant to corrosion
inert conditions meaning
unreactive
why is titanium expensive to produce
mg is expensive (requires electrolysis), need inert atmosphere, 4-5 days to make, time consuming.
Explain why different observations are made when aqueous barium chloride is added separately to aqueous magnesium sulfate and to aqueous magnesium nitrate.
because BaSO4 is insoluble and Ba(NO3)2 is
State the trend in reactivity with water of the elements down Group 2 from Mg to Ba
increases
Describe the structure and bonding in magnesium
lattice of Mg2+ ions. Electrostatic attraction between Mg2+ and delocalised electrons
State the trend in the atomic radius of the elements down Group 2 from Mg to Ba
Give a reason for this trend
increases due to the number of electron energy levels increases
