Chemistry Unit 1

Question 1

Electronegativity is…

Answer 1

a measure of an atom’s ability to attract shared electrons to itself.

Question 2

We can determine the type of bond by determining the ____________ between atoms

Answer 2

Difference in electronegativity

Question 3

> 1.7 is an ______ bond

Answer 3

Ionic

Question 4

<1.7 is a ________ bond

Answer 4

Covalent

Question 5

A non-polar bond is a ________ bond and has an _________ of _________.

Answer 5

covalent; difference in electronegativity; 0<EN<0.5

Question 6

A polar bond is a __________ bond and has an __________ of ___________.

Answer 6

covalent; difference in electronegativity; 0.5<EN<1.7

Question 7

Partial charges are when…

Answer 7

the distributions of charges among atoms are not equal; dipole moments

Question 8

Partial charges occur because…

Answer 8

electrons are not shared equally.

Question 9

Atom with _______ electronegativity attracts electrons and pulls them away from the other atom. These atoms develop a partial ______ charge and the other atom develops a partial ______ charge.

Answer 9

higher;negative;positive

Question 10

Bond polarity is…

Answer 10

dealing with the polarity of a SINGLE bond in a molecule.

Question 11

Molecular polarity…

Answer 11

deals with the polarity of the overall molecule.

Question 12

TRUE or FALSE: Having a polar bond leads to a polar molecule

Answer 12

FALSE: Having a polar bond does not mean you have a polar molecule

Question 13

Polar molecules are those that have a _______ dipole moment.

Answer 13

net

Question 14

What does net dipole moment mean?

Answer 14

The general direction of movement for electrons or the general charge.

Question 15

Where is the partial negative charge or partial positive charge in carbon and hydrogen?

Answer 15

There is none. It’s a non-polar molecule.

Question 16

Intermolecular forces occur ________ molecules.

Answer 16

between; one molecule is attracted to another

Question 17

Intramolecular forces occur ________ molecules.

Answer 17

within; bonds

Question 18

Intramolecular forces define the ________ properties of a substance.

Answer 18

chemical

Question 19

Intermolecular forces define the ________ properties of a substance.

Answer 19

physical

Question 20

Are intramolecular forces stronger or weaker than intermolecular forces?

Answer 20

Stronger

Question 21

Are intermolecular forces stronger or weaker than intramolecular forces?

Answer 21

Weaker

Question 22

What are dipole-dipole forces?

Answer 22

Intermolecular forces that occur between oppositely charged ends of polar molecules.

Question 23

What are hydrogen bonds?

Answer 23

A special type of dipole-dipole between hydrogen, and NOF (nitrogen, oxygen, or fluorine).

Question 24

What are London Dispersion Forces?

Answer 24

Forces that occur between all entities of molecules, including non-polar.

Question 25

Non-polar molecules can have LDF due to…

Answer 25

temporary dipoles.

Question 26

Ion-dipole forces are…

Answer 26

forces that occur between ions and polar molecules.

Question 27

List the strength of the bonds. (weakest to strongest)

Answer 27

LDF, Dipole-Dipole, Hydrogen Bond, Ion-dipole, Ionic Bond