Group 2

Frage	Antworten
Description	Alkaline earth metals
What type of agent are they?	[RA], lose 2 e- to form 2+ cations, oxidised.
Reactions to remember	M + O2 M + H2O M + DILUTE HCl MO + H2O
Redox w/ O2	2Ca + O2 -> 2Cao (s)
Redox w/ H2O	Sr(s) + H2O(l) -> Sr(OH)2(aq) + H2(g)
Redox w/ dilute acid	Ba(s) + 2HCl(aq) -> BaCl2(aq) + H2 (g)
Trend in reactivity and IE	Reactivity increases down a group IE decreases down a group.
Oxide w/ H2O	CaO + H2O -> Ca2(aq) + 2OH- (aq) Solution of alkaline hydroxide
Formation of hydroxide	Ca2+(aq) + 2OH- -> Ca(OH)2 (S)
Trends in solubility of HYDROXIDES	Solubility - ability to form bonds w/ H2O Release more OH- ions pH/alkalinity/sol. ^ down a group
Mg/Ba(OH)2 pH formed	Mg ~ 10 Ba ~ 13
Use of G2 compounds as bases - 2 examples	Neutralise acidic soil to form neutral water Antacids for indigestion
Example of 1.	Ca(OH)2(s) + H+(aq) -> Ca2+ (aq) + H2O (l)
Examples of 2	Milk of magnesia Mg(OH)2(s) + 2HCl(aq) -> MgCl2(s) + 2H2O(l) CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + H2O (l)

Zusammenfassung der Ressource

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