cm11 - Chapter 9 Naming Compounds Writing Formulas...

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Chapter 9 Naming Compounds Writing Formulas
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Systematic Naming There are too many compounds to remember the names of them all. Compound is made of two or more elements. Put together atoms. Name should tell us how many and what type of atoms.
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Periodic Table More than a list of elements. Put in columns because of similar properties. Each column is called a group.
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2A 1A 3A4A 5A 6A 7A 0 Representative elements The group A elements The tall columns
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Metals
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Transition metals The Group B elements
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Non-metals Dull Brittle Nonconductors - insulators
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Metalloids or Semimetals Properties of both Semiconductors
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Atoms and ions Atoms are electrically neutral. Same number of protons and electrons. Ions are atoms, or groups of atoms, with a charge. Different numbers of protons and electrons. Only electrons can move. Gain or lose electrons.
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Anion A n egative ion . Has gained electrons. Non metals can gain electrons. Charge is written as a superscript on the right. F 1- Has gained one electron O 2- Has gained two electrons
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Cations Positive ions. Formed by losing electrons. More protons than electrons. Metals form cations. K 1+ Has lost one electron Ca 2+ Has lost two electrons
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Two Types of Compounds 1 Molecular compounds Made of molecules. Made by joining nonmetal atoms together into molecules.
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Two Types of Compounds 2 Ionic Compounds Made of cations and anions. Metals and nonmetals. The electrons lost by the cation are gained by the anion. The cation and anions surround each other. Smallest piece is a FORMULA UNIT.
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Two Types of Compounds Smallest piece Melting Point State Types of elements Formula Unit Molecule Metal and Nonmetal Nonmetals solid Solid, liquid or gas High >300ºC Low <300ºC Ionic Molecular
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Chemical Formulas Shows the kind and number of atoms in the smallest piece of a substance. Molecular formula- number and kinds of atoms in a molecule. CO 2 C 6 H 12 O 6
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Formula Unit The smallest whole number ratio of atoms in an ionic compound. Ions surround each other so you can’t say which is hooked to which.
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Charges on ions For most of Group A elements, location on the Periodic Table can tell what kind of ion they form Elements in the same group have similar properties. Including the charge when they are ions.
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2+ 1+ 3+ 3- 2- 1- Charge in groups 1A, 2A and 3A is the group number in 5A, 6A and 7A is the group number - 8
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Can also use electron dots If it has a few it loses them If it has many, it gains enough for octet K + Al 3+ F - N 3-
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We have to figure those out some
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cm11 - Chapter 9 Naming Compounds Writing Formulas...

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