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GCSE Chemistry · key term
The mass of a molecule compared with one-twelfth of the mass of a carbon-12 atom; it is found by adding the relative atomic masses of all the atoms in the formula.
Used by AQA and Edexcel
Specification 4.1.2.6 · Paper 1
Revise: Physical Properties and Halide FormationA useful prediction follows from these trends: an element below iodine would be expected to have a greater relative molecular mass and generally higher melting and boiling points. A prediction should follow the trend; an exact value cannot be obtained unless sufficient numerical data are supplied.
Specification 9.17C · Paper 2
The total relative mass of all the atoms in a molecule, compared with one-twelfth of the mass of a carbon-12 atom; it has no unit.
Describe each Group 7 trend in the correct direction: relative molecular mass, melting point and boiling point all increase down the group.
Use the full definition: a polymer is a substance with a high average relative molecular mass and is made up of small repeating units.
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A polymer is a substance of high average relative molecular mass made up of small repeating units. Each polymer molecule contains the same small arrangement of atoms repeated many times along a long chain. The word polymer reflects this idea: poly means many and mer means part or unit.