lead
chromium
zinc
tin
C. zinc
TW Richards
FW Aston
Stas
Urey
chlorine
nitrogen
sulphur
hydrogen
Carbon monoxide
Oxygen
Nitrogen
Hydrogen
Silicon
Oxygen
Carbon
Calcium
Chloroform
Morphine
Streptomycin
Cocaine
sodium nitrate
Potassium nitrate
sodium thiosulphate
ammonium chloride
oxalic acid
citric acid
acetic acid
hydrochloric acid
Protons
Neutrons
Electrons
Protons and electrons
Carbon dioxide
Sulphur dioxide
Ammonia
Hydrogen
nickel
copper
sulphur
graphite
acetic acid
chloroform
urea
methane
gold
zinc
tin
molybdenum
animal charcoal
coal
wood charcoal
sugar charcoal
Fe and C
Mn and C
Fe and Mn
Fe, Mn and C
chlorine
carbon monoxide
sulphur dioxide
o-cresol
potassium
sodium
red phosphorus
white phosphorus
as a drying agent
as a refrigerant
as an antiseptic
as a bleaching agent
nitrogen
nitrous oxide
nitric oxide
nitrogen peroxide
phenol
washing soda
absolute alcohol
vinegar
Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Law of Reciprocal Proportions
white lead
graphite
red lead
coke
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
Nitric acid
Hydrochloric acid
Silver nitrate
Sulphuric acid
Limestone
FeO
SiO2
MgO
Dolomite
Magnetite
Bauxite
Anglesite
carbohydrates
proteins
salts
fats
rain water
river water
conductivity water
deep well water
Sedimentation
Electrophoresis
Tyndall effect
Brownian movement
adrenalin
glucagon
epinephrin
thyroxin
sodium chloride in water
iodine in alcohol
sulphur in carbon disulphide
Potassium iodide in water