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REVISION (PERIODIC TABLE (There are 8 groups in the periodic table., Group…
REVISION
PARTICLES
Compounds
A compound is a substance which consists of two or more separate elements combined chemically in a fixed ratio.
Mixtures
Heterogeneous
In heterogeneous mixtures the two or more substances are not evenly distributed throughout the mixture.
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Homogeneous
In homogeneous mixtures the two or more substances that form the mixture are evenly distributed throughout the mixture are .
E.g. vinegar, which is a mixture of ethanoic acid and water.
Elements
An element is a substance which consists of only one type of atom and is a pure substance that cannot be broken down.
PERIODIC TABLE
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Group 7 are called the halogens, they change from gas to solid as you go down the periodic table.
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Examples of Group 1: lithium, sodium, potassium
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