Ionic Compounds Quiz
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Questions and Answers

What occurs during the formation of an ionic bond?

A transfer of valence electrons from the metal species to the non-metal species occurs.

How do elements from the periodic groups combine to form an ionic compound according to the Lewis diagram?

Elements combine by transferring electrons to achieve a full valence shell.

Which of the following are physical properties of ionic compounds? (Select all that apply)

  • High melting points (correct)
  • Conductivity when solid
  • Brittle structure (correct)
  • Soluble in water (correct)

    • What is the crystal lattice in ionic compounds?

    <p>A three-dimensional geometric arrangement of positively and negatively charged ions.</p> Signup and view all the answers

    Ionic compounds are soluble in non-polar substances.

    <p>False</p> Signup and view all the answers

    Describe the conductivity of ionic compounds when solid and when molten or aqueous.

    <p>Ionic compounds do not conduct electricity when solid, but they conduct when molten or aqueous.</p> Signup and view all the answers

    What is a formula unit?

    <p>The simplest ratio of ions represented in an ionic compound.</p> Signup and view all the answers

    Ionic compounds are often ____ in water.

    <p>soluble</p> Signup and view all the answers

    What is ionic bonding?

    <p>The transfer of valence electrons from metals to nonmetals.</p> Signup and view all the answers

    What is the crystal lattice?

    <p>A three-dimensional geometric arrangement of particles.</p> Signup and view all the answers

    Ionic crystals are soft and malleable.

    <p>False</p> Signup and view all the answers

    Which property of ionic compounds requires a large amount of energy to overcome?

    <p>High melting and boiling points</p> Signup and view all the answers

    What makes ionic compounds soluble in water?

    <p>Polar solvents decrease the electrostatic force of attraction between the ions.</p> Signup and view all the answers

    Ionic compounds conduct electricity only when solid.

    <p>False</p> Signup and view all the answers

    What is a formula unit in the context of ionic compounds?

    <p>The simplest ratio of the ions represented in an ionic compound.</p> Signup and view all the answers

    How does the movement of electrons occur during ionic bond formation?

    <p>Electrons transfer from metal atoms to nonmetal atoms.</p> Signup and view all the answers

    What physical property causes ionic compounds to be brittle?

    <p>The strong bond between positive and negative ions.</p> Signup and view all the answers

    Why do ionic compounds have low conductivity when solid?

    <p>Ions are not free to move and carry electric current.</p> Signup and view all the answers

    Which chemical structure can be used to explain the bonding in Magnesium and Sulfur?

    <p>Lewis diagram (electron-dot structure).</p> Signup and view all the answers

    Study Notes

    Ionic Compound Names and Formulas

    • Ionic bonds form when electrons transfer from a metal to a nonmetal.
    • Lewis diagrams (electron-dot structures) show how elements combine.
    • Ionic compounds have high melting and boiling points.
    • Ionic compounds are hard, rigid, and brittle.
    • Ionic compounds conduct electricity when molten or dissolved in water (aqueous solutions).
    • Many ionic compounds are soluble in water.
    • A crystal lattice is the three-dimensional geometric arrangement of particles in an ionic compound.
    • Each positive ion is surrounded by negative ions, and each negative ion is surrounded by positive ions.

    Formula Units

    • A formula unit is the simplest ratio of ions in an ionic compound.
    • The formula unit of magnesium chloride (MgCl₂) reflects the 1:2 ratio of magnesium and chloride ions.
    • In sodium chloride (NaCl), the ratio of sodium to chloride ions is 1:1.

    Polyatomic Ions

    • Polyatomic ions are ions composed of more than one atom.
    • Common polyatomic ions include ammonium, nitrate, sulfate, and phosphate.

    Naming Ionic Compounds (without polyatomic ions)

    • Name the cation (positive ion) first, then the anion (negative ion).
    • For monatomic cations, use the element name.
    • For monatomic anions, use the root of the element name plus the suffix "-ide."
    • Examples: Potassium oxide, sodium chloride, magnesium bromide.

    Naming Ionic Compounds (with polyatomic ions)

    • Use the name of the polyatomic ion instead of the anion.
    • Examples: Sodium nitrate (NaNO₃), ammonium hydroxide (NH₄OH).
    • Examples: ammonium sulfide ((NH₄)₂S), potassium nitrate (KNO₃),

    Chemical Formula for Ionic Compounds

    • Cations are written before anions.
    • Cross multiply the charges to write the formula.
    • Divide any common factors to get the simplest formula.
    • Example: Magnesium oxide (MgO), Sodium nitrate (NaNO₃)

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    Ionic Compounds: Formulas & Names PDF

    Description

    Test your knowledge on ionic compounds, their formulas, and how they form through electron transfer. This quiz covers key concepts like Lewis diagrams, formula units, and polyatomic ions. Challenge yourself with questions on melting points, lattice structures, and solubility in water.

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