WebQuest

Atomic Orbitals and Bonding � Sigma and Pi Bonds

SIgma and Pi bonds

Please choose the correct answer to each question by using the knowledge you have gained in the duration of the web quest. Once all the questions have been answered, fill in your name and submit them for marking. Thank You.

Question #1

How many sigma bonds would you expect in an ethylene molecule (C2H4)?

a) 1

b) 2

c) 3

d) 4

e) 5

Question #2

A pi (π) bond

a) is stronger than a sigma bond

b) results from orbital overlap over and under the bond axis

c) is the same strength as a sigma bond

d) results from the overlap of orbitals on only one side of the bonded atoms

e) none of the above

Question #3

The total number of electrons that can be accommodated in a bonding orbital is:

a) 0

b) 2

c) 3

d) 1

e) 4

Question #4

Describe a triple bond in terms of sigma and pi bonds.

a) two bonds are sigma, one is pi

b) three bonds are sigma

c) three bonds are pi

d) two bonds are pi, one is sigma

e) none of the above

Question #5

How many s and p bonds, respectively, are in the following molecule: CH3CH2CHCHCH2CH3?

a) 18,1

b) 17,1

c) 19,0

d) 16,1

e) 14,5

Question #6

The C-N bonding consists of

a) one sigma bond

b) one pi bond

c) two sigma bonds and one pi bond

d) one sigma bond and one pi bond

e) one sigma bond and two pi bonds

Question #7

Which bonds restrict rotation of a molecular group about the bond axis? 1 = (σ) sigma bond 2 = (π) pi bond

a) 1 only

b) 2 only

c) 1 and 2

d) none

Question #8

Which sublevel can by occupied by a maximum of 10 electrons?

a) s

b) p

c) d

d) f

Question #9

Orbitals are not occupied by:

a) 0 electrons

b) 1 electron

c) 2 electrons

d) 3 electrons

Question #10

In a pi bond, the electron overlap in relation to the nuclei is

a) above the nuclei

b) below the nuclei

c) between the nuclei

d) both above and below the nuclei

e) on the right

Question #11

The electron-dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom?

a) CO2

b) NH3

c) CH4

d) HCN

e) H2S

Question #12

How many sigma and pi bonds would there be in a benzene ring?

a) 18σ, 3π

b) 15σ, 2π

c) 12σ , 3π

d) 3σ , 12π

e) 6σ , 3π

Question #13

For propane (CH3CH2CH3), what is the hybridization for each carbon?

a) sp

b) sp5

c) sp4

d) sp2

e) sp3

Question #14

Which of the following molecules will not have a π bond?

a) C2H2

b) C2H6

c) N2H2

d) None of the above.

e) All of the above.

Question #15

Which bond is stronger?

a) covalent and sigma

b) sigma

c) ionic

d) pi

e) none of the above

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WebQuest

Atomic Orbitals and Bonding � Sigma and Pi Bonds

SIgma and Pi bonds

Question #1

Question #2

Question #3

Question #4

Question #5

Question #6

Question #7

Question #8

Question #9

Question #10

Question #11

Question #12

Question #13

Question #14

Question #15

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