Electrons
The number of valence electrons found in an atom of a Group A element is equal to
A) its atomic number.
B) its mass number.
C) its group number.
D) eight.
E) eight minus the group number.
C) its group number.
The strongest interactions between molecules of ammonia, NH3, are
A) ionic bonds.
B) hydrogen bonds.
C) polar covalent.
D) dipole-dipole attractions.
E) dispersion forces.
B) hydrogen bonds.
The compound MgCl2 is named
A) magnesium chlorine.
B) magnesium dichloride.
C) magnesium(II) chloride.
D) magnesium chloride.
E) dimagnesium chloride.
D) magnesium chloride.
Which of the following substances contains a nonpolar covalent bond?
A) H2O
B) NaCl
C) NH3
D) MgF2
E) N2
E) N2
The VSEPR theory allows us to determine the most favorable
A) three-dimensional shape of a molecule.
B) charge on an ion.
C) color of a compound.
D) bond type for a molecule.
E) formula for a compound.
A) three-dimensional shape of a molecule.
Which of the following polyatomic ions has a positive charge?
A) hydroxide
B) sulfate
C) hydrogen carbonate
D) ammonium
E) nitrate
D) ammonium
The ammonia molecule, NH3, is
A) a polar molecule with polar bonds.
B) a nonpolar molecule with polar bonds.
C) a nonpolar molecule with nonpolar bonds.
D) a polar molecule with nonpolar bonds.
E) a polar molecule with ionic bonds.
A) a polar molecule with polar bonds.
The name of Al2(SO4)3 is
A) aluminum(III) sulfate.
B) dialuminum trisulfate.
C) dialuminum sulfate.
D) dialuminum trisulfide.
E) aluminum sulfate.
E) aluminum sulfate.
Which of the following compounds contains a polar covalent bond?
A) NaF
B) HCl
C) Br2
D) MgO
E) O2
B) HCl
The shape of the carbon tetrachloride molecule is
A) linear.
B) square.
C) trigonal pyramidal.
D) tetrahedral.
E) octagonal.
D) tetrahedral.
Fe2(SO4)3 is called
A) iron sulfate.
B) iron(II) sulfate.
C) iron(III) sulfate.
D) diiron trisulfate.
E) iron trisulfate.
C) iron(III) sulfate.
The carbon tetrachloride molecule, CCl4, is
A) a polar molecule with polar bonds.
B) a nonpolar molecule with polar bonds.
C) a nonpolar molecule with nonpolar bonds.
D) a polar molecule with nonpolar bonds.
E) a polar molecule with ionic bonds.
B) a nonpolar molecule with polar bonds.
The formula of copper(I) sulfide is
A) CuS.
B) Cu2S.
C) Cu2(SO4)3.
D) CuSO4.
E) CuS2.
B) Cu2S.
If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is
A) ionic.
B) nonpolar ionic.
C) nonpolar covalent.
D) polar covalent.
E) impossible.
A) ionic.
The water molecule has a dipole with the negative portion
A) localized between the hydrogen atoms.
B) pointing toward the oxygen atom.
C) localized on one of the hydrogens.
D) pointing from the oxygen through the hydrogen atoms.
E) surrounding the molecule.
B) pointing toward the oxygen atom.
How many electrons will aluminum gain or lose when it forms an ion?
A) lose 1
B) gain 5
C) lose 2
D) lose 3
E) gain 1
D) lose 3
The strongest interactions between molecules of iodine, I2, are examples of
A) ionic bonds.
B) covalent bonds.
C) hydrogen bonds.
D) dipole-dipole attractions.
E) dispersion forces.
E) dispersion forces.
The types of compounds that use prefixes in their names are
A) ionic compounds.
B) ionic compounds involving transition metals.
C) polyatomic ions.
D) covalent compounds.
E) compounds that contain polyatomic ions.
D) covalent compounds.
A polar covalent bond is found in which of these compounds?
A) H2O
B) F2
C) NaCl
D) H2
E) N2
A) H2O
The shape of the ammonia molecule (NH3) is
A) linear.
B) square.
C) trigonal pyramidal.
D) hexagonal.
E) octagonal.
C) trigonal pyramidal.
The ability of an atom to attract the shared electrons in a covalent bond is its
A) electronegativity.
B) bonding ability.
C) polarity.
D) ionic character.
E) nonpolarity.
A) electronegativity.
The strongest interactions in the compound sodium fluoride, NaF, are examples of
A) ionic bonds.
B) covalent bonds.
C) hydrogen bonds.
D) dipole-dipole attractions.
E) dispersion forces.
A) ionic bonds.
The correct name for the compound N2O3 is
A) nitrogen oxide.
B) nitrogen trioxide.
C) dinitride trioxide.
D) dinitrogen oxide.
E) dinitrogen trioxide.
E) dinitrogen trioxide.
The bond in Cl2 is a(n)
A) ionic bond.
B) nonpolar covalent bond.
C) metallic bond.
D) polar ionic bond.
E) no bond.
B) nonpolar covalent bond.
Hydrogen sulfide, H2S, has a shape similar to
A) carbon dioxide.
B) carbon monoxide.
C) hydrogen chloride.
D) water.
E) carbon tetrachloride.
D) water.