Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
Describe trends in ionisation energy and reactivity in 2. |
Ionisation energy decreases Reactivity increase |
|
Describe group 2 reactions with water |
Hydroxide forms E.g. Ca(s) + 2H2O(l) ~> Ca(OH)2 (aq) + H2 |
|
Describe group 2 reactions with oxygen |
Burns into a white solid 2Ca (s) + O2 (s) ~> 2CaO (s) |
|
Describe group 2 reactions with chlorine |
Reacts to form a solid white chloride Ca (s) + Cl2 (g) ~> CaCl2 (s) |
|
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) |
|
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) |
|
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 |
|
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 |
|
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 |
|
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 |
|
Flame test colours |
Go |
|
Lithium |
Red |
|
Sodium |
Orange |
|
Potassium |
Lilac |
|
Rubidium |
Red |
|
Cs |
Blue |
|
Calcium |
Brick red |
|
Strontium |
Crimson |
|
Barilium |
Green |
|
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. |