Matc NATSCI-186 Unit 4 Quiz - Inter-Particle Forces

Matc NATSCI 186 Unit 4 Quiz - Inter-Particle Forces

QUESTION 1 What are the intermolecular forces present between these two molecules?

C2H4        C2H4

a. Covalent Bonds

b. Hydrogen Bonds

c. Dipole-Dipole Attractions

d. London Dispersion Forces

 

QUESTION 2 Which intermolecular force would be the result of an ether molecule generating an interaction nearby another ether molecule?

a. Hydrogen Bond

b. Dipole-Dipole

c. London Dispersion

d. Induced Dipole-Dipole

 

QUESTION 3 Arrange the following forces from the strongest (1) to the weakest (5).

Ion-Ion (Ionic Bond)

Hydrogen Bond

Dipole-Dipole

Ion-Dipole

London Dispersion

A.           

4

B.           

1

C.           

5

D.           

2

E.           

3

 

QUESTION 4 Covalent compounds have _____________ melting point than ionic compounds.

a. same

b. lower

c. higher

 

QUESTION 5 What are the intermolecular forces present between these two molecules?

formaldehyde         formaldehyde

a. London Dispersion Forces

b. Hydrogen Bonds

c. Dipole-Dipole Attractions

d. Covalent Bonds

 

QUESTION 6 Arrange the following molecules in the order of increasing solubility in water (with the least soluble first):

 

CH2O          CH3Cl                 CH4              CHCl3

-

CH3Cl

-

CH2O

-

CHCl3

-

CH4

 

QUESTION 7 All molecules exhibit London Dispersion Forces between each other, but Dipole-Dipole and Hydrogen Bonding are so much stronger that when they are present, we can ignore the London Dispersion Forces. Which of these molecules exhibits ONLY London Dispersion Forces?

a. NH3

b. C3H8

c. CH3COOH

d. CH2O

 

QUESTION 8 A drop of each of the following compounds was placed on a table and the amount of time required for the compound to evaporate was recorded. From the table below, which of the compounds likely had the strongest intermolecular forces?

IPF

a. liquid B

b. liquid D

c. liquid C

d. liquid A

 

QUESTION 9Which molecule will undergo ONLY London dispersion forces when interacting with other molecules of the same kind?

a. CH2Cl2

b. NaC2H3O2

c. HF

d. C2H5OH

e. C4H10

 

QUESTION 10 Which intermolecular force is characteristic of compounds that are liquids at room temperature and have relatively high boiling points?

a. London Dispersion Forces

b. Covalent Bonds

c. Hydrogen Bonds

d. Dipole-Dipole Forces

e. Ionic Bonds

 

QUESTION 11 Which combination of characteristics is most likely to be associated with molecules having strong dipole-dipole interactions?

I.    polar bond

II.    asymmetric shape

III.    relatively low boiling point

IV.    large surface area

a. I and II

b. III and IV

c. II and IV

d. I and III

e. I, II, III, and IV

 

QUESTION 12 Which pair of molecules has the strongest dipole-dipole interactions?

a. NH3 and CH4

b. CO2 and CO2

c. CO2 and CH4

d. CH4 and CH4

e. NH3 and NH3

 

QUESTION 13Which is the best description of hydrogen bonding?

a. The temporary attraction between hydrogen atoms on different molecules resulting from shifts in electron density.

b. The unique chemical bonds between hydrogen and any other atom in the same molecule.

c. The association between hydrogen of one molecule and a region of another molecule which has become negative due to temporary shifts in electron density.

d. The association between a hydrogen atom which is somewhat positive because it is bonded to a small electronegative atom and an atom of O, N or F on another molecule.

e. The polarity associated with a bond between hydrogen and a small electronegative atom to which it is bonded.

 

QUESTION 14 London dispersion forces are also referred to as van der Waals forces.

 True

 False

 

QUESTION 15 Some nail polish removers contain acetone. When acetone evaporates, the covalent bonds between the carbon, hydrogen, and oxygen atoms are broken.

 True

 False

 

QUESTION 16Two ether molecules can form hydrogen bonds with each other.

 True

 False

 

QUESTION 17Ethers have stronger intermolecular forces than alkanes but weaker intermolecular forces than alcohols.

 True

 False

 

QUESTION 18 (CH3)2CHCHO has a lower boiling point than CH3CH2CH2CH2COOH.

 True

 Falsemo