chemistry

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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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Other cards in this set

Card 2

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

Back

Molecule

Card 3

Front

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

Back

Preview of the back of card 3

Card 4

Front

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.

Back

Preview of the back of card 4

Card 5

Front

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.

Back

Preview of the back of card 5
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