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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Hydration Energy
The energy change accompanying the hydration of a mole of gase and ions.
Anion
A negative ion, an atom or goup of atoms that has gained one or more electrons.
Ionization
In aqueous solution, the process in which a molecular compound reacts with water and forms ions.
Molarity
Number of moles of solute per litre of solution.
Basic Anhydride
The oxide of a metal that reacts with water to form a base.
Do you know: some mosquitoes bite people because of their clothes
If you have ever been bitten by a mosquito, someone nearby surely gave you an explanation of why the nasty insect decided to spoil your day. Maybe they told you that you smelt good, or you had a certain type of blood or that in that shirt you looked like a potential victim.
Particulate Matter
Fine divided solid particles suspended in polluted air.
Critical Mass
The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.
Salinometer
An instrument for measuring the amount of salt in a solution. Also,"salimeter, salometer."
Chemical Equation
Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.
