Chemistry Chapter 6 Review Flashcards
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Questions and Answers

What is a chemical bond?

A mutual electrical attraction between the nuclei and valence electrons of different atoms that binds the atoms together.

Identify and define the three major types of chemical bonding.

  • Ionic
  • Polar Covalent
  • Non-Polar Covalent
  • All of the above (correct)
  • What is the relationship between electronegativity and the ionic character of a chemical bond?

    The higher the difference in electronegativity values between atoms, the greater the ionic character of the bond.

    What is the meaning of the term polar, as applied to chemical bonding?

    <p>Atoms have unequal attraction for the shared electrons due to different electronegativities.</p> Signup and view all the answers

    Distinguish between polar-covalent and nonpolar-covalent bonds.

    <p>Polar-covalent bonds are shared unequally, while nonpolar-covalent bonds are shared equally.</p> Signup and view all the answers

    In general, what determines whether atoms will form chemical bonds?

    <p>The electron arrangement of the outer energy level of an atom.</p> Signup and view all the answers

    What is a molecule?

    <p>A neutral group of atoms held together by covalent bonds.</p> Signup and view all the answers

    What determines bond length?

    <p>The lowest potential energy between atoms.</p> Signup and view all the answers

    In general, how are bond energies and bond lengths related?

    <p>The greater the bond length, the lower the average bond energy.</p> Signup and view all the answers

    Describe the general location of the electrons in a covalent bond.

    <p>They lie between the two nuclei of the bonding atoms.</p> Signup and view all the answers

    What is meant by an unshared or lone pair of electrons?

    <p>Pairs of electrons in an atom that are not used for bonding.</p> Signup and view all the answers

    Describe the octet rule in terms of noble-gas configurations.

    <p>Noble gases do not interact because they have filled octets and are at lowest potential energy.</p> Signup and view all the answers

    When drawing Lewis structures, which atom is usually the central atom?

    <p>The least electronegative atom is usually the central atom.</p> Signup and view all the answers

    Distinguish between single, double, and triple covalent bonds.

    <p>All of the above</p> Signup and view all the answers

    In writing Lewis structures, how is the need for multiple bonds determined?

    <p>When there are not enough valence electrons to complete octets.</p> Signup and view all the answers

    What is an ionic compound?

    <p>Composed of positive and negative ions combined so the numbers of +/- charges are equal.</p> Signup and view all the answers

    In what form do most ionic compounds occur?

    <p>Crystalline solids.</p> Signup and view all the answers

    What is a formula unit?

    <p>The simplest ratio of atoms that make up an ionic compound.</p> Signup and view all the answers

    What are the components of one formula unit of CaF2?

    <p>One calcium cation and two fluoride anions.</p> Signup and view all the answers

    What is lattice energy?

    <p>The amount of energy released when one mole of ionic gas crystallizes into a solid.</p> Signup and view all the answers

    In general, what is the relationship between lattice energy and the strength of ionic bonding?

    <p>The greater the lattice energy, the stronger the ionic bond.</p> Signup and view all the answers

    In general, how do ionic and molecular compounds compare in terms of melting points?

    <p>Ionic bonds have higher melting/boiling points, making it harder to vaporize them.</p> Signup and view all the answers

    What accounts for the observed differences in the properties of ionic and molecular compounds?

    <p>Bond strength.</p> Signup and view all the answers

    Cite physical properties of ionic compounds.

    <p>All of the above</p> Signup and view all the answers

    What is a polyatomic ion?

    <p>A charged group of covalently bonded atoms.</p> Signup and view all the answers

    In what form do polyatomic ions often occur in nature?

    <p>Dissolved in water.</p> Signup and view all the answers

    How do the properties of metals differ from those of both ionic and molecular compounds?

    <p>Metals are shiny, usually solid at room temperature, malleable, ductile, and highly conductive.</p> Signup and view all the answers

    What specific property of metals accounts for their unusual electrical conductivity?

    <p>Metals have very few valence electrons because their outermost p-orbitals are empty.</p> Signup and view all the answers

    What properties of metals contribute to their tendency to form metallic bonds?

    <p>Empty outer p-orbitals.</p> Signup and view all the answers

    What is metallic bonding?

    <p>Attraction between metal atoms and the surrounding sea of electrons.</p> Signup and view all the answers

    How can the strength of metallic bonding be measured?

    <p>The strength is affected by the nuclear charge of metal atoms and the number of electrons in the sea.</p> Signup and view all the answers

    How is the VSEPR theory used to classify molecules?

    <p>VSEPR theory is used to classify molecules by shape based on electron repulsion.</p> Signup and view all the answers

    What molecular geometry would be expected for F2 and HF?

    <p>Linear.</p> Signup and view all the answers

    According to the VSEPR theory, what molecular geometries are associated with the following types of molecules?

    <p>All of the above</p> Signup and view all the answers

    Describe the role of unshared electron pairs in predicting molecular geometries.

    <p>Unshared electron pairs result in a bent/angular shape by repelling bonded atoms.</p> Signup and view all the answers

    Describe the role of double bonds in predicting molecular geometries.

    <p>Double bonds do not affect the molecular shape; they are considered like single bonds.</p> Signup and view all the answers

    What are hybrid orbitals?

    <p>Orbitals of equal energy produced by the combination of two or more orbitals on the same atom.</p> Signup and view all the answers

    What determines the number of hybrid orbitals produced by the hybridization of an atom?

    <p>The number of hybrid orbitals equals the number of orbitals that have combined.</p> Signup and view all the answers

    What are intermolecular forces?

    <p>The forces of attraction between molecules.</p> Signup and view all the answers

    In general, how do these forces compare in strength with those in ionic and metallic bonding?

    <p>Intermolecular forces are generally weaker than ionic/metallic bonding.</p> Signup and view all the answers

    What types of molecules have the strongest intermolecular forces?

    <p>Polar molecules.</p> Signup and view all the answers

    What is the relationship between electronegativity and the polarity of a chemical bond?

    <p>The greater the electronegativity, the greater the polarity.</p> Signup and view all the answers

    What are dipole-dipole forces?

    <p>The forces of attraction between polar molecules.</p> Signup and view all the answers

    What determines the polarity of a molecule?

    <p>If there are polar bonds that are not balanced by other polar bonds, the molecule is polar.</p> Signup and view all the answers

    What is meant by an induced dipole?

    <p>A polar molecule can induce a dipole in a nonpolar molecule by temporarily attracting its electrons.</p> Signup and view all the answers

    What is the everyday importance of the induced dipole?

    <p>The force accounts for the solubility of nonpolar O2 in water.</p> Signup and view all the answers

    What is hydrogen bonding?

    <p>The attractive force between hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule.</p> Signup and view all the answers

    What accounts for hydrogen bonding extraordinary strength?

    <p>Closeness to being ionic.</p> Signup and view all the answers

    What are London dispersion forces?

    <p>An attraction due to constant movements of electrons.</p> Signup and view all the answers

    Study Notes

    Chemical Bonds

    • Chemical bond: Mutual electrical attraction between nuclei and valence electrons of different atoms.
    • Types of bonds:
      • Ionic: Strongest (50-100% ionic character); formed by electrical attraction between cations and anions; electronegativity difference of 1.7-3.3.
      • Polar Covalent: Moderate (5-50% ionic character); unequal sharing of electrons; electronegativity difference of 0.3-1.7.
      • Non-Polar Covalent: Weakest (0-5% ionic character); equal sharing of electrons; electronegativity difference of 0-0.3.

    Electronegativity Relationships

    • Greater electronegativity difference results in higher ionic character.
    • Polar bonds arise from unequal attraction for shared electrons due to differing electronegativities.

    Molecular Structure

    • Molecule: Neutral group of atoms held by covalent bonds.
    • Bond length is determined by the lowest potential energy between atoms.
    • Inverse relationship between bond energy and bond length; longer bonds generally have lower energy.
    • Electrons in a covalent bond are positioned between the bonding atom nuclei.
    • Lone pairs: Electron pairs not involved in bonding.

    Octet Rule and Lewis Structures

    • Octet rule: Atoms achieve stable electron configurations by filling outer s and p orbitals, minimizing potential energy.
    • Central atom in Lewis structures: Typically the least electronegative atom, with exceptions for Carbon and Hydrogen.
    • Types of covalent bonds:
      • Single bond: Shares one pair of electrons.
      • Double bond: Shares two pairs of electrons.
      • Triple bond: Shares three pairs of electrons.

    Ionic Compounds

    • Ionic compounds consist of equal numbers of positive and negative ions.
    • Common form: Crystalline solids.
    • Formula unit: Simplest ratio of ions; for CaF2, it includes one calcium cation and two fluoride anions.
    • Lattice energy measures energy released when one mole of ionic gas crystallizes; greater lattice energy means stronger ionic bonding.

    Properties Comparison

    • Ionic compounds have higher melting and boiling points compared to molecular compounds, making them harder to vaporize.
    • Physical properties of ionic compounds: Brittle, solid at room temperature, hard, soluble in water, high melting/boiling points.
    • Metals differ from ionic and molecular compounds by being shiny, solid, malleable, ductile, and good conductors.

    Metallic Bonding

    • Metallic bonding involves attraction between metal atoms and surrounding sea of electrons.
    • Strength of metallic bonds is influenced by nuclear charge and number of delocalized electrons; measured by enthalpy of vaporization.

    VSEPR Theory and Molecular Geometries

    • VSEPR theory predicts molecular shapes based on electron repulsion; shapes include linear, trigonal planar, tetrahedral, trigonal-bipyramidal, and octahedral.
    • Unshared electron pairs lead to bent molecular shapes due to repulsion.
    • Double bonds do not alter molecular geometry compared to single bonds.

    Intermolecular Forces

    • Intermolecular forces are attractive forces between molecules; generally weaker than ionic and metallic bonds.
    • Polar molecules experience stronger intermolecular forces (dipole-dipole).
    • Induced dipoles occur when polar molecules attract electrons in nonpolar molecules.

    Special Bonding Interactions

    • Hydrogen bonding occurs between hydrogen and highly electronegative atoms in different molecules; accounts for unusual strength.
    • London dispersion forces arise from electron movement and exist between all molecules; significant in noble gases and nonpolar molecules.

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    Test your knowledge of chemical bonds with these flashcards focused on Chapter 6 of your chemistry curriculum. You'll explore key definitions and types of chemical bonding, including ionic and polar covalent bonds. Perfect for exam preparation!

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