tCH 2.1 - Review Energy and Temperature Phase changes...

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Review Energy and Temperature Phase changes solids liquids gases
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Elements Elements are materials that are composed of only one type of atom All elements are arranged on the periodic table
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Each element has a 1 or 2 letter abbreviation which is called its Atomic Symbol H is hydrogen Cl is chlorine K is potassium
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Elemental formulas While some elements exist as single atoms other need more than one to exist in nature Examples O 2 N 2 S 8
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Compounds Different elements can bind together and form compounds Compounds will contain 2 or more different elements Also their physical and chemical properties will be different from the properties of the original elements
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NaCl (table salt) Na (sodium) Soft metal (m.p. 97.5 °C) Reacts violently with water Cl (chlorine) Gas (b.p. -34 °C) Toxic and corrosive NaCl (sodium chloride) Solid powder (m.p. 800 °C)
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Can you predict what properties a compound will have based on the properties of the original elements that formed it? 1) yes 2) no
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Naming Compounds There are many different compounds that can be formed from the elements IUPAC naming rules for compounds:
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This note was uploaded on 04/14/2008 for the course CHEM 1305 taught by Professor Mason during the Spring '08 term at Texas Tech.

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tCH 2.1 - Review Energy and Temperature Phase changes...

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