Topic 4 Flashcards
1
Q
Testing for barium carbonate with sulphuric acid
A
It will be seen as not valid as most carbonates produce gas but barium sulphate is an insoluble precipitate
2
Q
Reactivity of group 1 and 2
A
Outer ELECTRON further away
Increased shielding
First ionisation energy decrease so reactivity increase
3
Q
Thermal stability of group 1 and 2
A
Group 2 has more electrons (similar size due to same subshell)
Group 2 more likely to polarise
4
Q
HCL and carbonate
A
-effervesence
2H++Co32-_____>Co2+H2O
5
Q
Flame test
A
energy released as visible light
diff amount of energy released so colour is different
6
Q
Ammonium and hydroxide
A
NH4+ + OH-____>NH3+H2O
7
Q
Hydrated magnesium chloride heated
A
-Brown gas
-solid dissolves
-White solid forms
8
Q
A
