Chem exam 10-12/15

Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present?

A) 180° only

B) 120° only

C) 90° only

D) 90°, 120°, and 180°

E) 60° and 90° only

D) 90°, 120°, and 180°

What is the molecular shape of the thiocyanate anion, SCN–, as predicted by the VSEPR theory? (Carbon is the central atom.)

A) bent

B) linear

C) angular

D) trigonal

E) None of these choices are correct

Linear

What is the molecular shape of NOCl as predicted by the VSEPR theory?

A) bent

B) linear

C) trigonal planar

D) trigonal pyramidal

E) tetrahedra

Bent

What is the molecular shape of NH2Cl as predicted by the VSEPR theory?
A) T-shaped

B) trigonal planar

C) trigonal pyramidal

D) see-saw

E) tetrahedra

Trigonal pyramidal

What is the molecular shape of ClF2–as predicted by the VSEPR theory?

A) L-shaped

B) see-saw

C) T-shaped

D) linear

E) bent

linear

What is the molecular shape of XeO2F2 as predicted by the VSEPR theory?

A) square planar

B) octahedral

C) square pyramidal

D) see-saw

E) tetrahedral

see-saw

Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

A) 90°

B) between 120 and 180°

C) 180°

D) 109°

E) 120°

120

Predict the actual bond angle in SeCl2using the VSEPR theory

A) less than 90°

B) between 90° and 109°

C) between 109° and 120°

D) exactly 90°

E) more than 120

between 90 and 109

Which of the following molecules has a net dipole moment?

A) CO2

B) BeCl2

C) SF2

D) CCl4

E) KrF2

SF2

Which of the following has no net dipole moment?

A) H2Se

B) TeO3

C) CH3Cl

D) N2O

E) NF3

TeO3

What is the molecular shape of the thiocyanate anion, SCN–, as predicted by the VSEPR theory? (Carbon is the central atom.)

A) bent

B) linear

C) angular

D) trigonal

E) None of these choices are correct.

linear

What is the molecular shape of BCl3as predicted by the VSEPR theory?

A) bent

B) trigonal pyramidal

C) linear

D) tetrahedral

E) trigonal planar

trigonal planar

What is the molecular shape of NO2–as predicted by the VSEPR theory?

A) resonant

B) tetrahedral

C) trigonal planar

D) bent

E) linear

bent

What is the molecular symmetry around the carbons in CCl2CH2as predicted by the VSEPR theory?

A) trigonal pyramidal

B) linear

C) trigonal planar

D) tetrahedral

E) bent

trigonal planar

What is the molecular shape of ClO3F as predicted by the VSEPR theory?

A) octahedral

B) square planar

C) trigonal pyramidal

D) square pyramidal

E) tetrahedral

tetrahedral

What is the molecular shape of SiF62– as predicted by the VSEPR theory?

A) tetrahedral

B) octahedral

C) trigonal bipyramidal

D) hexagonal

E) see-saw

octahedral

What is the molecular shape of ClF4– as predicted by the VSEPR theory?

A) tetrahedral

B) square pyramidal

C) octahedral

D) square planar

E) see-saw

square planar

Use VSEPR theory to decide which one of the following molecules and ions will have a trigonal pyramidal geometry. (The central atom is always first in the formula.)

A) BF3

B) BrF3

C) CO32–

D) SO3

E) PCl3

PCl3

Predict the ideal bond angles in GeCl4using the molecular shape given by the VSEPR theory

A) 90°

B) 180°

C) 109°

D) < 90°

E) 120°

109

Predict the ideal bond angles in FNO using the molecular shape given by the VSEPR theory.

A) 120°

B) 109°

C) 180°

D) 90°

E) between 120 and 180

120

Predict the ideal bond angles around carbon in C2I2 using the molecular shape given by the VSEPR theory.

A) 120°

B) 180°

C) 90°

D) 109°

E) None of these choices are correct.

180

Which one of the following molecules has a zero dipole moment?

A) SO2

B) CO

C) Cl2O

D) HCl

E) CS2

CS2

According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule?

A) sp3on N overlaps with sp on H

B) 2s on N overlaps with 1s on H

C) 2p on N overlaps with 1s on H

D) 2p on N overlaps with 2s on H

E) sp3on N overlaps with 1s on H

E) sp3on N overlaps with 1s on H

According to valence bond theory, Carbon uses ________ hybrid orbitals in ClCN.

A) sp3d

B) sp

C) sp2

D) sp3

E) sp3d2

sp

Valence bond theory predicts that iodine will use ________ hybrid orbitals in ICl2-

A) sp3d2

B) sp2

C) sp3

D) sp3d

E) None of these choices are correct.

sp3d

Valence bond theory predicts that bromine will use ________ hybrid orbitals in BrF5

A) sp3d

B) sp3d2

C) sp2

D) sp3

E) None of these choices are correct

sp3d2

according to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom? (central atom is bold) 

A) C2H6

B) C2H4

C) CO2

D) C2H2

E) H2O1

C2H4

According to valence bond theory, the triple bond in ethyne (acetylene, C2H2) consists of

A) one sigma bond and two pi bonds.

B) no sigma bonds and three pi bonds.

C) two sigma bonds and one pi bond.

D) three sigma bonds and no pi bonds.

E)None of these choices are correct.

one sigma bond and two pi bonds

Valence bond theory predicts that iodine will use ________ hybrid orbitals in ICl2-.

A) sp3d2

B) sp2

C) sp3

D) sp3d

E) None of these choices are correct

sp3d2

Select the correct statement about ʌ-bonds in valence bond theory.

A) A pi bond between two carbon atoms restricts rotation about the C–C axis.

B) A carbon-carbon double bond consists of two pi bonds.

C) A pi bond is stronger than a sigma bond.

D) A pi bond can hold 4 electrons, two above and two below the ı-bond axis.

E) A pi bond is the same strength as a sigma bond

A pi bond is the same strength as a sigma bond

How many sigma and pi bonds, respectively, are in the molecule below?CH3CH2CHCHCH3?

A) 15, 0

B) 16, 1

C) 15, 1

D) 16, 0

E) 14, 1

15,1

Give the hybridization for the C in H2CCH2.

A) sp3

B) sp3d

C) sp2

D) sp3d2

E) sp

sp