Simple molecular compounds

Question 1

What forces hold together simple molecular compound?

Answer 1

Intermolecular forces

Question 2

How are intermolecular forces broke?

Answer 2

They are overcome.

Question 3

What is a polar bond caused by?

Answer 3

An uneven distribution of electron density caused by a large difference in electronegativity

Question 4

What is a polar bond?

Answer 4

Oppositely partially charged molecules.

Question 5

What symbols show a polar bond?

Answer 5

Delta+ -positively charged
Delta - -negatively charged

Question 6

What is electronegitivity?

Answer 6

The ability of an atom to attract a bonding pair of electrons in a covalent bond.

Question 7

What is the most electronegative elements?

Answer 7

F,N,O and Cl.

Question 8

Where are the most electronegative elements on the periodic table?

Answer 8

Up and to the right

Question 9

What is a hydrogen bond caused by?

Answer 9

Delta+ Hydrogen covalently bonding with the lone pair on N/O/F because they have a large difference in electronegativity

Question 10

What attraction does hydrogen bonds have?

Answer 10

Strong electrostatic attraction.

Question 11

How is a hydrogen bond represented?

Answer 11

By a dashed line.

Question 12

What is a permanent dipole-dipole force caused by?

Answer 12

A large differnece in electronegitivlity between two elements in a covalent bond

Question 13

What is a dipole-dipole force between?

Answer 13

Between one d+ molecule and one d- molecule.

Question 14

How is a permanent dipole-dipole force shown?

Answer 14

A dotted line.

Question 15

What is van der Waals’ force between?

Answer 15

Between one d+ molocule and one d- molocule.

Question 16

How is a van der Waals’ force formed?

Answer 16

-Caused by random movement of electrons causing a temporary dipole.
-The partial charge cause electron density to be attracted/repelled to each other in nearby molecules causing an induced dipole between them.

Question 17

How is the melting and boiling points of Van Der Waals forces effected?

Answer 17

-Surface area
-Between larger the intermolecular forces are stronger so the partial charges increase.

Question 18

Order of the bonds from strongest to weakest:

Answer 18

1. Hydrogen bonds
   2.Permanent dipole-dipole forces
2. Van Der Waals forces.