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... • Heterogeneous Mixture-a mixture in which the presence of a t least two different substances is visible to the eye. • Homogenous Mixture-a mixture with a composition that is uniform throughout, all the way down to the molecular level. • Hydrocarbon-any molecule consisting of only hydrogen and carbo ...
MIDTERM EXAM – JANUARY, 2003
MIDTERM EXAM – JANUARY, 2003

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Document

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... Atoms will combine to form compounds to reach 8 electrons in their outer energy level. Atoms with less than 4 electrons will lose electrons For Na it is easier to lose 1 electron than to gain 7 electrons A Na atom has 11+ and 11- IF it loses one electron then 11+ and 10Atoms with more than 4 electro ...
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MYP Chemistry: Final Review

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Common Chemical Formula List

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Ion

An ion (/ˈaɪən, -ɒn/) is an atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.Ions can be created, by either chemical or physical means, via ionization. In chemical terms, if a neutral atom loses one or more electrons, it has a net positive charge and is known as a cation. If an atom gains electrons, it has a net negative charge and is known as an anion. An ion consisting of a single atom is an atomic or monatomic ion; if it consists of two or more atoms, it is a molecular or polyatomic ion. Because of their electric charges, cations and anions attract each other and readily form ionic compounds, such as salts. In the case of physical ionization of a medium, such as a gas, what are known as ""ion pairs"" are created by ion impact, and each pair consists of a free electron and a positive ion.
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