Chem Hw 1 -Bonding and Isomerism

What is the most electropositive element?

A) Li

B) Be

C) B

D) C

E) N

A) Li

Which of the following elements has three electrons in the valence (outer) shell?

A) C

B) B

C) S

D) F

E) N

B) B

Which of the following would you expect to have ionic bonds?

A) HBr

B) CO

C) ICl

D) CsF

E) NF 3

D) CsF

Which of the following would you expect to have polar covalent bonds?

A) MgF 2

B) N 2

C) F 2

D) NF 3

E) NaF

D) NF 3

Which molecule has nonpolar covalent bonds?

A) NO

B) N 2

C) BCl 3

D) HF

E) CCl 4

B) N2

The number of electrons in the valence shell of sulfur is:

A) 2

B) 3

C) 4

D) 5

E) 6

E) 6

Which of the following elements is the most electronegative?

A) O

B) S

C) Se

D) Te

E) Po

A) O

If the Cl–Cl bond length is 1.98Å and the C–C bond length is 1.54Å, what would you expect

the bond length of Cl–C to be?

A) 0.74Å

B) 1.54Å

C) 1.76Å

D) 1.98Å

E) 3.52Å

C) 1.76Å

Given the following electronegativity values, predict the most polar covalent bond below:

F 4.0

Cl 3.0

O 3.5

C 2.5

H 2.1

A) C–F

B) C–Cl

C) C–O

D) C–H

E) C–C

A) C–F

The most electronegative elements in the periodic table are generally found

A) toward the left in a horizontal row and toward the top in a column.

B) toward the right in a horizontal row and toward the top in a column.

C) toward the left in a horizontal row and toward the bottom in a column.

D) toward the right in a horizontal row and toward the bottom in a column.

E) distributed randomly throughout the table.

B) toward the right in a horizontal row and toward the top in a column.

The mass of a proton is approximately equal to the mass of a:

A) Neutron

B) Electron

C) Protons

D) Nucleous

E) Positron

A) Neutron

In which molecule do polar bonds exist, but the molecule as a whole is nonpolar?

A) CO 2

B) H 2 O

C) NH 3

D) HF

E) CH4

A) CO 2

Which factor primarily determines whether a molecule is polar or nonpolar?

A) Number of atoms present

B) Atomic mass of the central atom

C) Molecular geometry (shape) and bond polarity

D) Size of the molecule

E) Number of electrons present

C) Molecular geometry (shape) and bond polarity

The number of possible resonance structure for SO 3 is

A) 2

B) 3

C) 4

D) 5

E) 1

B) 3

What is the formal charge of oxygen in HCOH molecule

A) 0

B) 1

C) 2

D) -1

E) -2

A) 0

What is the formal charge of the HCOH molecule

A) 1

B) +1

C) 0

D) -1

E) -2

C) 0

For carbon monoxide, C has a formal charge of:

A) +1

B) –1

C) 0

D) –2

E) +2

B) –1

For carbon monoxide, O has a formal charge of:

A) +1

B) –1

C) 0

D) –2

E) +2

A) +1

What is the formal charge of N in HNO 3 , as seen below?

A) +1

B) +2

C) 0

D) –1

E) –2

A) +1

The shape of the CH 4 (methane) molecule can be described as a

A) square planar

B) trigonal planar

C) trigonal pyramidal

D) tetrahedral

E) square pyramidal

D) tetrahedral

Which of the following is an amide functional group?

A) -CNH 2

B) -CONH 2

C) -COOR

D) –OR

E) -OH

B) -CONH 2

Which of the following molecules contain the same functional group?

CH 3 OH CH 3 OCH 3 CH 3 CH 2 OH CH 3 CH(OH)CH 3

1 2 3 4

A) 1, 2 and 3

B) 1, 3 and 4

C) 1 and 2

D) 2 and 4

E) 3 and 4

B) 1, 3 and 4

Which of the following molecules contain the same functional group?

1. CH 3 OH 2. CH 3 OCH 3 3. CH 3 COOH

4. CH 3 COOCH 3 5. CH 3 CH 2 OH

A) 1 and 2

B) 1, 2 and 5

C) 2 and 4

D) 3 and 4

E) 1 and 5

E) 1 and 5

What is the molecular formula of an alkane that has fourteen carbon atoms?

A) C 14 H 28

B) C 14 H 30

C) C 14 H 32

D) C 14 H 34

E) C 14 H 26

B) C 14 H 30

What is the molecular formula of a cycloalkane that has six carbon atoms?

A) C 6 H 12

B) C 6 H 14

C) C 6 H 16

D) C 6 H 10

E) C 6 H 7

A) C 6 H 12

Which of the following is the aldehyde functional group?

A) -CHO

B) -CO

C) -COOH

D) -CX

E) -COH

A) -CHO

Which of the following is the ketone functional group?

A) -CHO

B) -COR

C) -COOH

D) -CX

E) -COH

B) -COR

Which of the following is the ether functional group?

A) -CHO

B) -CO

C) -COOH

D) -C-O-C-

E) -COH

D) -C-O-C-

How many sigma (σ) and pi (π) bonds are in a molecule of ethene (C₂H₄)?

A) 3 σ, 3 π

B) 4 σ, 2 π

C) 5 σ, 1 π

D) d6 σ, 0 π

E) 2 σ, 2 π

C) 5 σ, 1 π

Which of the following molecules contains only sigma bonds?

A) Ethyne (C₂H₂)

B) Ethene (C₂H₄)

C) Ethane (C₂H₆)

D) Benzene (C₆H₆)

E) Propene(C 3 H 6 )

C) Ethane (C₂H₆)