13358380
Description
Flashcards by I Shouldn't be awake, updated more than 1 year ago
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Created by I Shouldn't be awake
over 6 years ago
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| Question | Answer |
| 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) |
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