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Flash Point

The temperature at which a liquid will yield enough flamable vapour to ignite. There are various recognized industrial testing methods, therefore the method used must be stated.

Conformations

Structures of a compound that differ by the extent of rotation about a single bond.

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Zinc

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.

Exothermicity

The release of heat by a system as a process occurs.

Absorption Spectrum

Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Electrolysis

Process that occurs in electrolytic cells.

Alkali Metals

Metals of Group IA (Na, K, Rb).