Keywords-atoms
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Atom |
The smallest part of an element that can still be recognised as that element.
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element |
A substance made up of only one type of atom. An element can't be broken down chemically into simple substances.
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compound |
A substance made when two or more different elements are chemically bonded together.
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nucleus |
The very small and dense central part of an atom that contains protons and neutrons.
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electron |
A subatomic particle with a negative charge. These are found orbiting the nucleus of atoms or ions in shells.
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neutron |
A dense subatomic particle found in the nucleus of an atom. It is electrically neutral, carrying no charge.
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proton |
A tiny positive subatomic particle found inside the nucleus of an atom.
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reactant |
A substance we start with before a chemical reaction takes place.
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products |
A substance made as a result of a chemical reaction.
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mixture |
When some elements or compounds are mixed together and intermingle but do not react together (i.e. no new substance is made). A mixture is not a pure substance.
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filtration |
The technique used to separate substances that are insoluble in a particular solvent from those that are soluble.
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crystallisation
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Separating a soluble solid from a solvent, for example, salt (sodium chloride) from salt solution.
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distillation |
Separating a solvent from soluble solids dissolved in the solvent by successive evaporation and condensation. Seawater is distilled to obtain pure water.
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chromatography |
The process of separating dissolved substances by running a solvent along a material (e.g. absorbent paper).
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* This sentence was added by a Spellzone user.
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