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- 1 M = Co₂ = 44g/mol
Wednesday, 22nd January, 2020
- Chemistry 2 (Essay) › 2:00 pm-4:00 pm
- Chemistry 1 (Objective) › 4:00 pm -5:00 pm
(i) Sodium trioxonitrate (v) decahydrate
NaNO₃ . 10H₂O
(ii) Sodium Oxide –> Na₂O
(iii) Potassium tetraoxophospate (v) –> K₃PO₄
Products formed are:
Hydrogen gas (a+ cathode)
Chlorine gas (a+ anode)
it decrease down the group
As the atomic radius increases down the group the attraction of the positive nucleus of the electron outer most electron, thus the ionization energy decreases
Nitrogen and carbon (ii) oxide
it is used to heat furnace
it is a source of nitrogen for the manufacture of ammonia
Sodium hydrogen – used in qualitative analysis
– Purification of bauxite
Sodium trioxocarbonate (iv)
-Manufacture of glass
-As a water soften
MnO₄⁻ + C₂O₄ + H+ –> Mn²+ Co₂ + H₂O
(i) it must be in acidic medium
I : C₂O₄²- — Oxidized (reducing Agent)
II : MnO₄⁻ — Reduced (Oxidizing Agent)
MnO₄⁻ + 8H+ + 5e- –> Mn²+ 4H₂O
Filtration the water is passed through a filter bed to remove the remaining fine particles of diot
Chlorination: Chorine is added to water to kill germs
I | II | III| IV | V | VI | VII | VIII
LI Be |B | O | P
X | |Si | Q
Y | R
(i) Reactive metal : Y
(II) most reactive non – mental –> P
(iii) most reactive electronegative – element P
(cii) Electronic configuration of Y
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
(c) MgCo₃(i) –> MgO(s) + CO₂(g)
PV = Nrt
Nn = M/m
PV = m/M RT
m = MPV/RT
m = 44 x 200 x 78/8.31 x 300
P = 200m
V = 78cmᶟ
T = 27°C = 273 + 27 = 300k
R = 8.31
M = Co₂ = 44g/mol
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