Discovered: known in India and China before 1500 and to the Greeks and Romans before 20 BC as the copper-zinc alloy brass
Origin: The name is derived from the German ‘Zink’.
Atomic no: 30
Mass No: 65
Description: A grey metal with a blue tinge. World production exceeds 7 million tons a year, and it is used to galvanise iron to prevent it rusting. It is also employed in alloys and batteries, and as zinc oxide to stabilise rubber and plastics. Zinc is essential for all living things, and is important for growth and development. The average human body contains about 2.5 grams and takes in about 15 milligrams per day. Some foods have above average levels of zinc, including herring, beef, lamb, sunflower seeds and cheese.
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Features of the Scanning Tunneling Microscope
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Mother Nuclide
Nuclide that undergoes nuclear decay.
Thermal Cracking
Decomposition by heating a substance in the presence of a catalyst and in the absence of air.
Heat of Condensation
The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.
Creating Malachite egg
One of the most interesting and obvious chemical experiments is the experiment on the interaction of copper sulfate and calcium carbonate. The latter is contained in the shell of a simple egg, but copper sulphate should be searched in a chemical reagent store. This experience is simple, but effective and visual, and as a result we will get something beautiful.
K Capture
Absorption of a K shell (n=1) electron by a proton as it is converted to a neutron.
Molecular Equation
Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.
Heterogeneous Mixture
A mixture that does not have uniform composition and properties throughout.
Saccharide
An organic compound containing a sugar or sugars.
Chemical Periodicity
The variations in properties of elements with their position in the periodic table.
Colloid
A heterogeneous mixture in which solute-like particles do not settle out.
