charcoal
bleaching powder
chlorine
carbolic acid
A. charcoal
isobars
isotopes
isomorphs
isomers
it is an allotrope of carbon
it gives CO2 on heating
it contains free electrons
it is oxidised to graphitic acid
red phosphorus and oxygen
white phosphorus and oxygen
carbon monoxide and chlorine
carbon dioxide and chlorine
sodium chloride in water
iodine in alcohol
sulphur in carbon disulphide
Potassium iodide in water
Sodium
red phosphorus
white phosphorus
sulphur
aldehydes
alkenes
amino acids
alkynes
ten
twenty
zero
fifty
A
C
B12
B1
poling
tempering
calcination
galvanising
manganese
vanadium
nickel
chromium
fractional distillation
fractional crystallisation
sublimation
evaporation
they may appear better
they can resist the action of acids and alkalies
they lose their brittleness
they can withstand temperature shocks
land pollution
air pollution
noise pollution
water pollution
CaO
Ca(OH)2
NaOH
Na2CO3
it contains carbonates of calcium and magnesium
it contains sodium chloride
it is highly coloured
it contains suspended impurities
a cupel
a long narrow chamber
an open furnace
a closed furnace
acid fumes
sodium bicarbonate
carbon dioxide
sodium carbonate
silicate
protein
fat
carbohydrate
dephlogisticated air
azote
inflammable air
marine acid air
from coal mines
when wood is burnt in excess of air
by heating coal out of contact with air
by heating wood out to contact with air
homogeneous, sulphates
heterogeneous, nitrates
heterogeneous, carbonates
homogeneous, silicates
nickel
copper
sulphur
graphite
is unaffected by temperature variations
decreases with increase of temperature
increases with decrease of temperature
increases with increase of temperature
Rusting of iron
Burning of magnesium
Sublimation of iodine
Electrolysis of water
Potassium nitrate
Silver nitrate
Ammonium carbonate
Ammonium bicarbonate
Ammonium nitrate
Nitre
Charcoal powder
Sulphur
gypsum
urea
potassium nitrate
ammonium phosphate
1 and 3
2 and 3
1, 2 and 4
1, 2, 3 and 4
ethane
ethylene
acetylene
methane
vitamin C
vitamin B2
vitamin A
vitamin E