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acidic

Overview page. Subjects: Chemistry — Environmental Science.

1 Describing a compound that is an acid.

2 Describing a solution that has an excess of hydrogen ions.

3 Describing a compound that...

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agrochemical

Overview page. Subjects: Environmental Science — Chemistry.

Synthetic chemicals that are used in agriculture to fertilize soil (fertilizers), and to control animal pests (pesticides) and weeds (herbicides).

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allotrope

Overview page. Subjects: Environmental Science — Chemistry.

Two or more different physical forms in which a particular element exists. For example, carbon has two allotropes, diamond and graphite.

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aluminium sulphate

Overview page. Subjects: Chemistry — Environmental Science.

A compound that is used in sewage treatment and for the purification of drinking water. It causes dirt and other particles to clump together and fall to the bottom of settling basins. It is...

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attractant

Overview page. Subjects: Chemistry — Environmental Science.

A chemical or agent that attracts insects or other pests by stimulating their sense of smell.

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beryllium

Overview page. Subjects: Environmental Science — Chemistry.

Symbol Be. A grey metallic element of group 2 (formerly IIA) of the periodic table; a.n. 4; r.a.m. 9.012; r.d. 1.85; m.p. 1278°C; b.p. 2970°C. Beryllium occurs as beryl (3BeO.Al2O3.6SiO2)...

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biocatalyst

Overview page. Subjects: Chemistry — Environmental Science.

An enzyme that activates or speeds up a biochemical reaction in a bioprocess. See also biotechnology, industrial biocatalyst.

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bromine

Overview page. Subjects: Chemistry — Environmental Science.

Symbol Br. A halogen element; a.n. 35; r.a.m. 79.909; r.d. 3.13; m.p. –7.2°C; b.p. 58.78°C. It is a red volatile liquid at room temperature, having a red-brown vapour. Bromine is obtained...

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buffering capacity

Overview page. Subjects: Chemistry — Environmental Science.

The ability of a medium (such as soil or water) to resist rapid changes in pH. Also known as alkalinity or acid neutralizing capacity.

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butane

Overview page. Subjects: Chemistry — Environmental Science.

A gaseous hydrocarbon that is extracted from natural gas or refinery gas, and is used as household fuel, a propellant, and a refrigerant.

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