Chemistry Definitions

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compound
A substance formed from two or more chemically bonded elements in a fixed ratio, usually shown by a chemical formula
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electron shielding
The repulsion between electrons in different inner shells. Shielding reduces the net attractive force from the positive nucleus on the outer-shell electrons.
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empirical formula
The simplest whole-number ratio of atoms of each element present in a compound.
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group
A vertical column in the Periodic Table. Elements in a group have similar chemical properties and their atoms have the same number of outer shell electrons.
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hydrolysis
A reaction with water or aqueous hydroxide ions that breaks a chemical compound into two compounds.
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molar volume
The volume per mole of a gas. The units of molar volume are dm3 mol–1. At room temperature and pressure the molar volume is approximately 24.0 dm3 mol–1.
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oxidation
Loss of electrons or an increase in oxidation number.
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oxidation number
A measure of the number of electrons that an atom uses to bond with atoms of another element. Oxidation numbers are derived from a set of rules.
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redox reaction
A reaction in which both reduction and oxidation take place.
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thermal decomposition
The breaking up of a chemical substance with heat into at least two chemical substances.
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Card 2

Front

The repulsion between electrons in different inner shells. Shielding reduces the net attractive force from the positive nucleus on the outer-shell electrons.

Back

electron shielding

Card 3

Front

The simplest whole-number ratio of atoms of each element present in a compound.

Back

Preview of the back of card 3

Card 4

Front

A vertical column in the Periodic Table. Elements in a group have similar chemical properties and their atoms have the same number of outer shell electrons.

Back

Preview of the back of card 4

Card 5

Front

A reaction with water or aqueous hydroxide ions that breaks a chemical compound into two compounds.

Back

Preview of the back of card 5
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