Please enable JavaScript.
Coggle requires JavaScript to display documents.
Group 16 Elements (Physical properties (Atomic mass increases, Atomic…
Group 16 Elements
Occurrence
-
Sulphur
In combined form as sulphates, gypsum, Epsom salt, baryte
zinc blende, galena, copper pyrites
As H2S in volcanoes, hot springs, in meteorites
Onion, garlic, mustard, eggs, proteins, hair, wool
-
-
-
-
Allotropy
-
Sulphur as alpha, beta, gamma, homocyclic,plastic,
Selenium as red monoclinic, grey metallic, dark brown, vitreous and red amorphous
-
-
-
Chemical properties
-
-
Action of alkalies
S, As, Te dissolve in alkalies
-
Action of non metals
Combine directly with carbon, hydrogen and halogens
Action of metals
S, Se, Te form sulphide, selenides, telluride
-
-
-
Dioxygen
Preparation
Thermal decomposition of chlorates
nitrates, permanganate, dichromates
-
-
-
-
Properties
Colorless, odorless, tasteless
-
-
-
Heavier than air, paramagnetic, three isotopes
Chemical properties
-
Reactions with metals
Na, K, CA react at room temperature
-
-
-
-
Oxides
Acidic oxides
-
-
Co2, b2o3, n2o5, so2, so3, cl2o7
-
Amphoteric oxides
-
Al2o3, sio2, zno, pbo, sno,etc
-
Ozone
-
Properties
Blue gas, blue black liquid and violet black solid
-
-
-
-
-
-
Sulphur dioxide
-
Properties
Colorless, acidic, pungent smell, high solubility in water
-
-
-
-
-
Sulphuric acid
-
Lead chamber process
Mixture of SO2 , NO and air is treated with stream
Properties
Colorless, dense, oily liquid
-
Oxidising agent, less volatile
-
-
-