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2.2.7: Molecular and Ionic Compounds (Problems)

  • Page ID
    210635
  • PROBLEM \(\PageIndex{1}\)

    Using the periodic table, predict whether the following chlorides are ionic or covalent: KCl, NCl3, ICl, MgCl2, PCl5, and CCl4.

    Answer

    Ionic: KCl, MgCl2; Covalent: NCl3, ICl, PCl5, CCl4

    PROBLEM \(\PageIndex{2}\)

    Using the periodic table, predict whether the following chlorides are ionic or covalent: SiCl4, PCl3, CaCl2, CsCl, CuCl2, and CrCl3.

    Answer

    Ionic: CaCl2, CuCl2, CsCl, CrCl3; Covalent: SiCl4, PCl3

    PROBLEM \(\PageIndex{3}\)

    For each of the following compounds, state whether it is ionic or covalent. If it is ionic, write the symbols for the ions involved:

    (a) NF3
    (b) BaO
    (c) (NH4)2CO3
    (d) Sr(H2PO4)2
    (e) IBr
    (f) Na2O

    Answer a

    covalent

    Answer b

    ionic, Ba2+, O2−

    Answer c

    ionic, \(\ce{NH4+}\), \(\ce{CO3^2-}\)

    Answer d

    ionic, Sr2+, \(\ce{H2PO4-}\)

    Answer e

    covalent

    Answer f

    ionic, Na+, O2−

    PROBLEM \(\PageIndex{4}\)

    For each of the following pairs of ions, write the symbol for the formula of the compound they will form:

    (a) Ca2+, S2−
    (b) \(\ce{NH4+}\), \(\ce{SO4^2-}\)
    (c) Al3+, Br
    (d) Na+, \(\ce{HPO4^2-}\)
    (e) Mg2+, \(\ce{PO4^3-}\)

    Answer a

    CaS

    Answer b

    (NH4)2CO3

    Answer c

    AlBr3

    Answer d

    Na2HPO4

    Answer e

    Mg3 (PO4)2

    PROBLEM \(\PageIndex{5}\)

    For each of the following pairs of ions, write the symbol for the formula of the compound they will form:

    (a) K+, O2−
    (b) \(\ce{NH4+}\), \(\ce{PO4^3-}\)
    (c) Al3+, O2−
    (d) Na+, \(\ce{CO3^2-}\)
    (e) Ba2+, \(\ce{PO4^3-}\)

    Answer a

    K2O

    Answer b

    (NH4)3PO4

    Answer c

    Al2O3

    Answer d

    Na2CO3

    Answer e

    Ba3(PO4)2

    PROBLEM \(\PageIndex{6}\)

    Name the following compounds:

    (a) CsCl
    (b) BaO
    (c) K2S
    (d) BeCl2
    (e) HBr
    (f) AlF3

    Answer a

    cesium chloride

    Answer b

    barium oxide

    Answer c

    potassium sulfide

    Answer d

    beryllium chloride

    Answer e

    hydrogen bromide

    Answer f

    aluminum fluoride

    PROBLEM \(\PageIndex{7}\)

    Name the following compounds:

    (a) NaF
    (b) Rb2O
    (c) BCl3
    (d) H2Se
    (e) P4O6
    (f) ICl3

    Answer a

    sodium fluoride

    Answer b

    Rubidium oxide

    Answer c

    boron trichloride

    Answer d

    hydrogen selenide

    Answer e

    tetraphosphorous hexaoxide

    (if you are googling the answers to your homework, google may disagree with you. But we are naming based on the rules we just learned, which is why you shouldn't trust google for the answers to your homework)

    Answer f

    Iodine trichloride

    PROBLEM \(\PageIndex{8}\)

    Write the formulas of the following compounds:

    (a) rubidium bromide
    (b) magnesium selenide
    (c) sodium oxide
    (d) calcium chloride
    (e) hydrogen fluoride
    (f) gallium phosphide
    (g) aluminum bromide
    (h) ammonium sulfate

    Answer a

    RbBr

    Answer b

    MgSe

    Answer c

    Na2O

    Answer d

    CaCl2

    Answer e

    HF

    Answer f

    GaP

    Answer g

    AlBr3

    Answer h

    (NH4)2SO4

    PROBLEM \(\PageIndex{9}\)

    Write the formulas of the following compounds:

    (a) lithium carbonate
    (b) sodium perchlorate
    (c) barium hydroxide
    (d) ammonium carbonate
    (e) sulfuric acid
    (f) calcium acetate
    (g) magnesium phosphate
    (h) sodium sulfite

    Answer a

    Li2CO3

    Answer b

    NaClO4

    Answer c

    Ba(OH)2

    Answer d

    (NH4)2CO3

    Answer e

    H2SO4

    Answer f

    Ca(C2H3O2)2

    Answer g

    Mg3(PO4)2

    Answer h

    Na2SO3

    PROBLEM \(\PageIndex{10}\)

    Write the formulas of the following compounds:

    (a) chlorine dioxide
    (b) dinitrogen tetraoxide
    (c) potassium phosphide
    (d) silver(I) sulfide
    (e) aluminum nitride
    (f) silicon dioxide

    Answer a

    ClO2

    Answer b

    N2O4

    Answer c

    K3P

    Answer d

    Ag2S

    Answer e

    AlN

    Answer f

    SiO2

    PROBLEM \(\PageIndex{11}\)

    Write the formulas of the following compounds:

    (a) barium chloride
    (b) magnesium nitride
    (c) sulfur dioxide
    (d) nitrogen trichloride
    (e) dinitrogen trioxide
    (f) tin(IV) chloride

    Answer a

    BaCl2

    Answer b

    Mg3N2

    Answer c

    SO2

    Answer d

    NCl3

    Answer e

    N2O3

    Answer f

    SnCl4

    PROBLEM \(\PageIndex{12}\)

    Each of the following compounds contains a metal that can exhibit more than one ionic charge. Name these compounds:

    (a) Cr2O3
    (b) FeCl2
    (c) CrO3
    (d) TiCl4
    (e) CoO
    (f) MoS2

    Answer a

    chromium(III) oxide

    Answer b

    iron(II) chloride

    Answer c

    chromium(VI) oxide

    Answer d

    titanium(IV) chloride

    Answer e

    cobalt(II) oxide

    Answer f

    molybdenum(IV) sulfide

    PROBLEM \(\PageIndex{13}\)

    Each of the following compounds contains a metal that can exhibit more than one ionic charge. Name these compounds:

    (a) NiCO3
    (b) MoO3
    (c) Co(NO3)2
    (d) V2O5
    (e) MnO2
    (f) Fe2O3

    Answer a

    nickel (II) carbonate

    Answer b

    Molybdenum (VI) oxide

    Answer c

    cobalt (II) nitrate

    Answer d

    vanadium (V) oxide

    Answer e

    manganese (IV) oxide

    Answer f

    iron (III) oxide

    PROBLEM \(\PageIndex{14}\)

    The following ionic compounds are found in common household products. Write the formulas for each compound:

    (a) potassium phosphate
    (b) copper(II) sulfate
    (c) calcium chloride
    (d) titanium dioxide
    (e) ammonium nitrate
    (f) sodium bisulfate (the common name for sodium hydrogen sulfate)

    Answer a

    K3PO4

    Answer b

    CuSO4

    Answer c

    CaCl2

    Answer d

    TiO2

    Answer e

    NH4NO3

    Answer f

    NaHSO4

    PROBLEM \(\PageIndex{15}\)

    The following ionic compounds are found in common household products. Name each of the compounds:

    (a) Ca(H2PO4)2
    (b) FeSO4
    (c) CaCO3
    (d) MgO
    (e) NaNO2
    (f) KI

    Answer a

    calcium dihydrogen phosphate

    Answer b

    iron (II) sulfate

    Answer c

    calcium carbonate

    Answer d

    magnesium oxide

    Answer e

    sodium nitrite

    Answer f

    potassium iodide

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