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Description
Flashcards by Talya Hambling, updated more than 1 year ago
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Created by Talya Hambling
almost 9 years ago
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| Question | Answer |
| what happens when group 2 elements react with water | they produce a metal hydroxide [(OH)2]and hydrogen |
| what happens when group 2 elements react with oxygen | they produce a solid white oxide |
| what happens when group 2 elements react with chlorine | they produce a solid white chloride |
| how do oxides and hydroxides react with water | oxides form hydroxides hydroxides form the same hydroxide (no change) |
| how do oxides and hydroxides react with dilute acid | both oxides and hydroxides form a metal chloride and water |
| what are solubility trends down group 2 | for sulphates, solubility increases going UP for hydroxides, solubility increases DOWN |
| what is thermal stability | how much heat it takes to break something down. higher thermal stability means more energy needed |
| what are thermal stability trends down a group | down a group, elements get more thermally stable. this is because they are larger, so the charge is more spread out, causing less distortion |
| how thermally stable is group 2 | much less than group 1. this is because they have a higher charge (2+) so cause more distortion |
| describe how group 1 carbonates and nitrates decompose | group 1 carbonates don't decompose, they are to thermally stable. group 1 nitrates decompose to form a nitrate and oxygen. |
| describe how group 2 carbonates and nitrates decompose | group 2 carbonate decompose to form an oxide and carbon dioxide. group 2 nitrates decompose to form an oxide, nitrogen dioxide and oxygen |
| how can we test for thermal stability (in nitrates and carbonates) | see how long it takes for the carbonate to form CO2 (add it to limewater to tell). and see how long it takes for the nitrate to form oxygen (try to relight a splint) |
| what are the fame tests for group 1 and 2 | little children stand yelling potatoes potatoes come read bible of god. lithium crimson sodium yellow potassium purple calcium red barium green |
| what is the explanation for flame test colours | as energy is absorbed from the flame, electrons move to higher energy levels. as they fall back down, light is releases. the colours are determine by how far they fall. |
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