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a group of atoms held together by chemical bonds.
molecule which generally contains carbon atoms. There are some exceptions including CO2 , HÂ...
a collection of more than one pure substance in no fixed proportion.
the transfer of heat or energy from areas of higher temperatures to areas of lower temperatures...
a measure of the amount of substance per unit volume. Unit: mol.dm-3
various substances that are added to polymers to reduce their cost and to improve their physical...