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Chemistry Glossary

Chemistry Glossary IB

Activation energy The minimum amount of combined total kinetic energy a colliding pair of ions, atoms or molecules require for a chemical reaction to occur. It may be thought of as the size of the energy barrier that has to be overcome to form the transition state.
Air pollutant A substance present in sufficient concentration in the air to produce a harmful effect on humans or other animals, vegetation or materials.
Alcohols (monohydric) A homologous series of organic compounds containing the functional group -OH and the general formula C(n)H(2n+1)OH
Alkali An alkali is a strong base which is soluble in water. Alkalis are Group 1 metal hydroxides, aqueous solution of ammonia, aqueous solution of amines and barium hydroxide.
Alkali metals The group of very reactive metals in Group 1 of the Periodic Table. They react with water to release hydrogen gas and form strongly alkaline solutions.