Question :
31.Which of the following statements concerning molecular polarity correct?
a.All diatomic : 1309592
31.Which of the following statements concerning molecular polarity is correct?
a.All diatomic molecules are polar.
b.All linear triatomic molecules are nonpolar.
c.Triatomic molecules in which all bonds are polar must be polar.
d.More than one correct response.
e.No correct response.
32.Which of the following tetrahedral molecules is polar?
a.CH4
b.CF4
c.CH3F
d.more than one correct response
e.no correct response
33.A period 2 nonmetal, X, forms the molecular compound NX3. Which of the following are also correct formulas for molecular compounds involving X?
a.HX
b.OX2
c.C2X
d.more than one correct response
e.no correct response
34.For which of the following pairs of compounds do both members of the pair have names that contain the prefix di-?
a.SCl2 and K2O
b.CO2 and N2O
c.N2O3 and H2S
d.more than one correct response
e.no correct response
35.For which of the following pairs of molecular compounds do both members of the pair contain the same number of atoms per molecule?
a.hydrogen peroxide and ammonia
b.hydrazine and methane
c.phosphine and ethane
d.more than one correct response
e.no correct response
36.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided.
(1) Nonbonding electron pairs are present on both the H and the F in the molecule HF.
(2) The two atoms involved in a multiple covalent bond must always be atoms of the same element.
(3) A molecule of hydrogen peroxide contains more atoms than does a molecule of ammonia.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
37.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided.
(1) Once a coordinate covalent bond is formed, there is no way to distinguish it from any of the other covalent bonds in a molecule.
(2) The least electronegative elements are located to the far right in the periodic table.
(3) The central concept of VSEPR theory is that the electron groups in the valence shell of a central atom in a molecule attract each other.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
38.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided.
(1) A nitrogen-oxygen bond is more polar than a nitrogen-fluorine bond.
(2) There are no nonbonding electron pairs present on the central atom in a trigonal planar molecule.
(3) The “normal” number of covalent bonds that the element carbon forms is four.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
39.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided.
(1) The predicted formula of the simplest molecular compound formed between nitrogen and fluorine is NF2.
(2) The majority of compounds contain covalent bonds rather than ionic bonds.
(3) In VSEPR theory, double bonds exert double the influence of single bonds in determining molecular geometry.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
40.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided.
(1) The number of “electron dots” in the Lewis formula for the compound HNO3 is 24.
(2) Atoms participating in coordinate covalent bonds generally do not form the “normal” number of covalent bonds expected for that element.
(3) Some molecules are nonpolar even though all bonds within the molecules are polar.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
