chemistry

Created by: notesonaconditionalform
Created on: 15-04-19 11:10

Atom

This is the smallest particle of an element. Scientists originally thought that it was impossible to split the atom, but this is not the case.

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Molecule

A cluster of non-metal atoms that are chemically bonded together. The atoms in a molecule are joined by covalent bonds. The atoms always join in fixed ratios and molecules have a specific formula

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Ion

An ion is an electrically charged particle, formed when an atom or a molecule loses or gains electrons. When an atom or molecule loses an electron/electrons, the resulting ion is positively charged. When atom or molecule gains an electron/electrons

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Element

A pure substance that is listed in the periodic table and only has one type of atom in it. There are over 100 elements. Most are metals, a few are metalloids (also known as semi-metals), and the rest are non-metals.

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Compound

A pure substance made from more than one type of element chemically bonded together. Elements bond in fixed ratios and so can be represented by a chemical formula. For example, sodium chloride has the same number of sodium ions and chloride ions.

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Mixture

An impure substance made from different elements or compounds mixed together that are not chemically joined. Mixtures can usually be separated by physical techniques such as filtering and distillation.

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Front

A cluster of non-metal atoms that are chemically bonded together. The atoms in a molecule are joined by covalent bonds. The atoms always join in fixed ratios and molecules have a specific formula