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    Writing Formulas and Naming Compounds

    Uploaded by

    Maria Romela Murillo
    The document provides instructions on writing formulas and naming compounds. It outlines learning objectives related to writing formulas for ionic compounds using the crisscross method, recognizing polyatomic ions, using rules to name ionic compounds, and determining names of acids from their formulas. Examples are given to practice writing formulas for ionic compounds using the crisscross method and naming ionic and covalent compounds as well as acids based on their formulas.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Writing Formulas and Naming Compounds

    Uploaded by

    Maria Romela Murillo
    105 views17 pages
    The document provides instructions on writing formulas and naming compounds. It outlines learning objectives related to writing formulas for ionic compounds using the crisscross method, recognizing polyatomic ions, using rules to name ionic compounds, and determining names of acids from their formulas. Examples are given to practice writing formulas for ionic compounds using the crisscross method and naming ionic and covalent compounds as well as acids based on their formulas.

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    The document provides instructions on writing formulas and naming compounds. It outlines learning objectives related to writing formulas for ionic compounds using the crisscross method, recognizing polyatomic ions, using rules to name ionic compounds, and determining names of acids from their formulas. Examples are given to practice writing formulas for ionic compounds using the crisscross method and naming ionic and covalent compounds as well as acids based on their formulas.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    105 views17 pages

    Writing Formulas and Naming Compounds

    Uploaded by

    Maria Romela Murillo
    The document provides instructions on writing formulas and naming compounds. It outlines learning objectives related to writing formulas for ionic compounds using the crisscross method, recognizing polyatomic ions, using rules to name ionic compounds, and determining names of acids from their formulas. Examples are given to practice writing formulas for ionic compounds using the crisscross method and naming ionic and covalent compounds as well as acids based on their formulas.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 17

    Writing

    Formulas and
    Naming
    Compounds
    Learning Outcomes
    At the end of the lesson, students
    should be able to:

    » Write the correct formula for an ionic compound;


    » Recognize polyatomic ions in chemical formulas;
    » Use the rules for naming ionic compounds;
    » Know the name of a simple molecular compound
    from its chemical formula; and
    » Determine the name of acids.

    2
    Writing Formulas
    of Ionic
    Compounds

    3
    Formulas of Ionic Compounds
    » In the solid state, ionic compounds
    are in crystal lattice containing
    many ions each of the cation and
    anion.
    » An ionic formula, is an empirical
    formula.
    » Because the overall compound must be
    electrically neutral, it is important to know how
    many of each ion is needed in order for the
    positive and negative charges to cancel each
    other out.

    4
    Rules in Writing Formulas
    In writing the correct formula for an ionic
    compound, crisscross method is used.
    1. Write the symbol and charge of the cation (metal) first
    and the anion (nonmetal) second.
    2. Transpose only the number of the positive charge to
    become the subscript of the anion and the number only
    of the negative charge to become the subscript of the
    cation.
    3. Reduce to the lowest ratio.
    4. Write the final formula. Leave out all subscripts that
    are 1. If the subscript of the polyatomic ion is greater
    than one, enclose in parentheses the polyatomic ion
    before writing the subscript.

    5
    Let us Practice

    COMPOUND POSITIVE ION NEGATIVE ION FORMULA

    aluminum sulfate Al3+ SO42- Al2(SO4)3

    Potassium chloride

    Tin (IV) oxide

    Lead (II) iodide

    Bismuth nitrate

    Sodium carbonate

    Strontium chromate
    6
    Let us Practice

    COMPOUND POSITIVE ION NEGATIVE ION FORMULA

    Calcium sulfate Ca2+ SO42- CaSO4

    Potassium chloride K+ Cl- KCl

    Tin (IV) oxide Sn4+ O2- SnO2

    Lead (II) iodide Pb2+ I- PbI2

    Bismuth nitrate Bi3+ NO3- Bi(NO3)3

    Sodium carbonate Na+ CO32- Na2CO3

    Strontium chromate Sr2+ CrO42- SrCrO4


    7
    Naming of
    Compounds

    8
    9
    Nomenclature Summary

    10
    Let us Practice : Ionic Compounds

    COMPOUND NAME

    ZnCl2

    K3PO4

    Cu(NO3)2

    Ni(OH)2

    BaO

    (NH4)2C2O4

    SnO2
    11
    Let us Practice : Ionic Compounds

    COMPOUND NAME

    ZnCl2 Zinc chloride

    K3PO4 Potassium phosphate

    Cu(NO3)2 Copper (II) nitrate

    Ni(OH)2 Nickel (II) hydroxide

    BaO Barium oxide

    (NH4)2C2O4 Ammonium oxalate

    SnO2 Tin (IV) oxide


    12
    Let us Practice : Covalent Compounds

    COMPOUND NAME

    NO2

    PCl3

    CO

    P2O5

    CCl4

    SiO2

    SF4
    13
    Let us Practice : Covalent Compounds

    COMPOUND NAME

    NO2 Nitrogen dioxide

    PCl3 Phosphorous trichloride

    CO Carbon monoxide

    P2O5 Diphosphourous pentoxide

    CCl4 Carbon tetrachloride

    SiO2 Silicon dioxide

    SF4 Sulfur tetrafluoride


    14
    Let us Practice : Acids

    COMPOUND NAME

    HF

    HBr

    HI

    HClO3

    HNO2

    H2SO3

    H3PO4
    15
    Let us Practice : Acids

    COMPOUND NAME

    HF Hydrofluoric acid

    HBr Hydrobromic acid

    HI Hydroiodic acid

    HClO3 Chloric acid

    HNO2 Nitrous acid

    H2SO3 Sulfurous acid

    H3PO4 Phosphoric acid


    16
    Thank you for
    listening!

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