(U2) Group 2 Elements And Their Compounds Flashcards
1
Q
What is an s-block element? (2)
A
- An element which has an atom with highest energy/outer electron
- in an s-subshell (orbital)
2
Q
What is solubility? (3)
A
- The maximum mass of solute
- that will dissolve in 100 g of solvent
- at a stated temperature
3
Q
What is a base?
A
A proton acceptor
4
Q
What is thermal stability?
A
The ability of a substance to resist the effects of heating
5
Q
What is the trend in thermal stability down group II compounds? (4)
A
- charge density decreases
- metal cations less able to polarise the C-O, O-H bonds etc
- more energy needed to break the bonds
- resulting in thermal stability increasing
6
Q
What is the flame colour for Strontium?
A
Crimson
7
Q
What are the everyday uses of:
- MgO
- CaCO3
A
- MgO = indigestion remedy
- CaCO3 = in toothpaste
8
Q
What is the trend in solubility of group II sulphates?
A
Solubility decreases down the group
9
Q
What is the trend in solubility of group II hydroxides?
A
Solubility increases down the group
10
Q
What are the industrial uses of CaCO3 (limestone)
A
Thermally decomposed to produce CaO:
- used in building materials e.g. cement
- reacts to produce calcium silicate in blast furnace
11
Q
What does calcined mean?
A
Thermally decomposed
