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1.Electrons involved in the formation of a covalent bond are
A.transferred from one atom to another.
B.found only in s-orbitals.
C.valence electrons.
D.in filled orbitals.
2.The chemical bond formed when two atoms share one or more pairs of electrons is
A.an ionic bond.
B.a molecular orbital.
C.a dipole.
D.a covalent bond.
3.A nonpolar covalent bond is most likely to form between two elements that have a difference in electronegativity values of
A.0-0.5.
B.0.5-2.1.
C.2.1-3.0.
D.3.0 or higher.
4.A polar covalent bond is most likely to form between two elements that have a difference in electronegativity values of
A.0-0.5.
B.0.5-2.1.
C.2.1-3.0.
D.3.0 or higher.
5.Why does the HBr molecule, sometimes written as Hδ+Brδ-, have a partial positive and partial negative charge?
A.The electronegativity of bromine is larger than hydrogen, which causes electrons to transfer to bromine.
B.The electronegativities of bromine and hydrogen are roughly the same, which shifts the location of shared electrons between elements. -
C.The electronegativity of hydrogen is larger than bromine, which shifts the location of shared electrons toward hydrogen.
D.The electronegativity of bromine is larger than hydrogen, which shifts the location of shared electrons toward bromine.
6.Which of the following substances most likely has the lowest boiling point?
A.Cl2
B.HF
C.MgCl2
D.Cu
7.Which of the following is NOT true of a covalent bond formation?
A.A covalent bond formation occurs between nonmetals.
B.A covalent bond formation can occur between two atoms of the same element.
C.Electrons are always shared equally among atoms.
D.Multiple pairs of electrons may be shared.
8.As the difference between electronegativity values of two elements joined by a bond ____________________, the degree of the bond’s polarity increases.
A.increases
B.decreases
C.remains the same
D.changes
9.If the difference in electronegativity values between two elements is 0.1, they will most likely form __________ covalent bond.
A.a polar
B.a nonpolar
C.an ionic
D.a molecular
10.If the difference in electronegativity values between two elements is 1.3, they will most likely form __________ covalent bond.
A.a polar
B.a nonpolar
C.an ionic
D.a molecular
1.Electrons involved in the formation of a covalent bond are
A.transferred from one atom to another.
B.found only in s-orbitals.
C.valence electrons.
D.in filled orbitals.
2.The chemical bond formed when two atoms share one or more pairs of electrons is
A.an ionic bond.
B.a molecular orbital.
C.a dipole.
D.a covalent bond.
3.A nonpolar covalent bond is most likely to form between two elements that have a difference in electronegativity values of
A.0-0.5.
B.0.5-2.1.
C.2.1-3.0.
D.3.0 or higher.
4.A polar covalent bond is most likely to form between two elements that have a difference in electronegativity values of
A.0-0.5.
B.0.5-2.1.
C.2.1-3.0.
D.3.0 or higher.
5.Why does the HBr molecule, sometimes written as Hδ+Brδ-, have a partial positive and partial negative charge?
A.The electronegativity of bromine is larger than hydrogen, which causes electrons to transfer to bromine.
B.The electronegativities of bromine and hydrogen are roughly the same, which shifts the location of shared electrons between elements. -
C.The electronegativity of hydrogen is larger than bromine, which shifts the location of shared electrons toward hydrogen.
D.The electronegativity of bromine is larger than hydrogen, which shifts the location of shared electrons toward bromine.
6.Which of the following substances most likely has the lowest boiling point?
A.Cl2
B.HF
C.MgCl2
D.Cu
7.Which of the following is NOT true of a covalent bond formation?
A.A covalent bond formation occurs between nonmetals.
B.A covalent bond formation can occur between two atoms of the same element.
C.Electrons are always shared equally among atoms.
D.Multiple pairs of electrons may be shared.
8.As the difference between electronegativity values of two elements joined by a bond ____________________, the degree of the bond’s polarity increases.
A.increases
B.decreases
C.remains the same
D.changes
9.If the difference in electronegativity values between two elements is 0.1, they will most likely form __________ covalent bond.
A.a polar
B.a nonpolar
C.an ionic
D.a molecular
10.If the difference in electronegativity values between two elements is 1.3, they will most likely form __________ covalent bond.
A.a polar
B.a nonpolar
C.an ionic
D.a molecular