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1. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy
2. a subject or situation under consideration: a great deal of work was done on this matter

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each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.

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a substance formed from two or more elements chemically united in fixed proportions: a compound of hydrogen and oxygen | lead compounds.

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1. the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.
2. the complex emotional or psychological interaction between people

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A Homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout a given sample (or multiple samples of different proportion). Homogeneous mixtures can have a variable composition.

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a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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1.Physical properties can be observed or measured without changing the composition of matter