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Published byTerence Wilkinson Modified over 9 years ago
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Putting Atoms Together
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Learning Goals I will be able to identify the difference between ionic and covalent compounds. I will be able to count the number of atoms in compounds and molecules.
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Key Terms Molecule – two or more atoms joined together by a chemical bond Chemical formula – tells us the type and number of atoms in a molecule eg. CaCl 2 Subscript – tells us the number of each atom in a chemical formula Diatomics – a molecule that is made up of two atoms of the same element. H 2 O 2 F 2 Br 2 I 2 N 2 Cl 2
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Why do elements form compounds? Most elements on their own are not stable. To be stable, an element needs 8 electrons in their valence (outer) shell this is called the octet rule So…elements form compounds to get 8 electrons.
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Ionic Compounds Formed by a metal and a nonmetal They have ions (charged particles) Metals: positively charged (cation); give up/lose electrons Nonmetals: negatively charged (anions); take/gain electrons
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Molecular/Covalent Compounds Formed by two or more nonmetals They share the electrons
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Counting Atoms Identify as ionic or molecular. How many of each type of element are present in each compound? C 2 H 6 CaBr 2 Al 2 O 3 NH 4 (BrO 3 ) 2
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Learning Goals Revisited I will be able to identify the difference between ionic and covalent compounds. I will be able to count the number of atoms in molecules.
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Please Complete … Counting Atom Worksheet p261 #2, 3, 5, 6a, 7, 8
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