Thiokol
Drikold
Perhydrol
Mannitol
B. Drikold
Sodium
red phosphorus
white phosphorus
sulphur
fractional distillation
fractional crystallisation
sublimation
evaporation
wood charcoal
animal charcoal
coconut charcoal
lamp black
adding milk of lime
filtering through sand
adding filter alum
chlorination
hydrochloric acid
ammonia
cane sugar
common salt
an anaesthetic
a psychedelic drug
an antipyretic
an antibiotic
a very sweet smell
a very pungent smell
an irritating smell
no smell at all
tin and copper
tin and lead
tin and zinc
tin, copper and zinc
dichloro-phenoxy-acetic acid
superphosphate of lime
chlorofluorocarbons (CFC)
dichloro-diphenyl-trichloro-ethane
malathion
parathion
zinc phosphide
diuron
they may appear better
they can resist the action of acids and alkalies
they lose their brittleness
they can withstand temperature shocks
ZnSO4 . 7H2O
FeSO4 . 7H2O
MgSO4 . 7H2O
CaSO4 . 2H2O
Rusting of iron
Burning of magnesium
Sublimation of iodine
Electrolysis of water
Chloroform
Morphine
Streptomycin
Cocaine
the percentage of carbon dioxide in air is kept almost constant
air always contains a constant proportion of oxygen
sufficient amounts of carbohydrates are produced
the process of photosynthesis proceeds smoothly
Wohler
Dalton
Lavoisier
Fischer
oxidise ammonia to nitrates
convert nitrogen into ammonia
oxidise ammonia to free nitrogen
oxidise ammonia to oxides of nitrogen
Bronze
Brass
Solder
Gun metal
a congenital disease
a communicable disease
an acquired disease
a contagious disease
Cholera
Dysentery
Diabetes
Measles
sucrose
maltose
glucose
fructose
sulphur
phosphorus
iodine
bromine
carbohydrates
proteins
salts
fats
diamond
coke
graphite
charcoal
Vitamin B6
Vitamin C
Vitamin K
Vitamin D
white lead
graphite
red lead
coke
sodium bicarbonate
sodium carbonate
carbonic acid
sodium hydroxide
as an analgesic
in the purification of water
as a fertilizer
as a disinfectant
chlorination
boiling
adding caustic soda
ozonisation
silica, sodium nitrate and soda ash
silica, limestone and sodium nitrate
silica, sodium oxide and limestone
silica, soda ash and limestone