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20 Cards in this Set
- Front
- Back
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Describe trends in ionisation energy and reactivity in 2. |
Ionisation energy decreases Reactivity increase |
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Describe group 2 reactions with water |
Hydroxide forms E.g. Ca(s) + 2H2O(l) ~> Ca(OH)2 (aq) + H2 |
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Describe group 2 reactions with oxygen |
Burns into a white solid 2Ca (s) + O2 (s) ~> 2CaO (s) |
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Describe group 2 reactions with chlorine |
Reacts to form a solid white chloride Ca (s) + Cl2 (g) ~> CaCl2 (s) |
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What happens when an oxide reacts and hydroxide react with water |
C MgO + H2O ~> Mg(OH)2 (aq)
Mg(OH)2 (s) ~> Mg(OH)2 (aq) |
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What happens to oxides and hydroxides when the react with dilute acid |
CaO(s) + 2HCL (aq) ~> CaCl2 (aq) + 2H2O (l) Ca(OH)2 (aq) + 2HCl(aq) ~> CaCl2 (aq) + 2H2O(l) |
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Describe the trend of solubility of group 2 elements with single charged negative ions and double charged negative ions |
Single charge go down in solubility in as you go down group 2 whereas double charge goes up and you go up the group. Barium sulphate is insoluble |
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What happens to thermal stability as you go down the group |
Stability increases because bigger ions have a less electron density so they are less likely to cause distortion |
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Describe group 1 reactions with Carbonate and Nitrate |
Carbonates can't decompose at Bunsen burner tempterures, however Li2CO3 is an exception forming Li2O + CO2
Nitrates decompose to give a nitrate and oxygen 2KNO3 ~> 2KNO2 + O2 LiNO3 is an exception because it forms Li2O + NO2 + O2 |
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What happens to group 2 carbonates and nitrates when the thermally decompose? |
Carbonates decompose to form an oxide and carbondioxide MgCO ~> MgO + CO2
Nitrates decompose to form an oxide, nitrate and oxygen 2Mg(NO3)2 ~> 2MgO + 4NO2 + O2 |
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Flame test colours |
Go |
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Lithium |
Red |
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Sodium |
Orange |
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Potassium |
Lilac |
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Rubidium |
Red |
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Cs |
Blue |
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Calcium |
Brick red |
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Strontium |
Crimson |
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Barilium |
Green |
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Why are there different xolours |
Colours are energy being released in the form of light due to being heated up and moving back down to a lower energy level. |
