Ch7 Review

Question 1

What type of bond is formed between elements with a difference in electronegativity less than 0.5?

Answer 1

Non polar Covalent Bond

Question 2

What type of bond is formed between elements with a difference in electronegativity between 0.5-2.1?

Answer 2

Polar Covalent Bonds

Question 3

What type of bond is formed between elements with a difference in electronegativity more than 2.1-3.5?

Answer 3

Ionic Bond

Question 4

Atoms on the ___ (left or right) side of the periodic table tend to form negative ions because they can easily ___ (gain or lose) electrons.

Answer 4

Right; gain

Question 5

A stable atom in a Lewis dot configuration is surrounded by ____ valence electrons

Answer 5

8

Question 6

True or false? When a molecule involves one central atom, surrounded by four other atoms, it can adopt a trigonal planar shape, but not a bent shape.

Answer 6

False (because there can be a lone pair at the top, causing it to bend away)

Question 7

What bond type is likely to form between Ca and O?

Answer 7

Ionic (calcium loses and oxygen gains)

Question 8

What bond type is likely to form between Li and Cl?

Answer 8

Ionic (Chlorine gains and lithium loses)

Question 9

What bond type is likely to form between N and O?

Answer 9

Covalent Bond (share electrons to be stable)

Question 10

What molecular shape(s) is formed around a central atom with 2 areas of electron density (domains)?

Answer 10

Linear

Question 11

What molecular shape(s) is formed around a central atom with 3 areas of electron density (domains)?

Answer 11

Trigonal planar and bent

Question 12

What molecular shape(s) is formed around a central atom with 4 areas of electron density (domains)?

Answer 12

Tetrahedral, trigonal pyramidal, and bent

Question 13

Which bond is this:
Atom 1 has high electronegativity
Atom 2 has high electronegativity
The difference in electronegativity is very little
There is equal electron sharing

Answer 13

Nonpolar covalent bond

Question 14

Which bond is this:
Atom 1 has high electronegativity
Atom 2 has medium electronegativity
The difference in electronegativity is moderate
There is uneven electron sharing

Answer 14

Polar covalent bond

Question 15

Which bond is this:
Atom 1 has high electronegativity
Atom 2 has low electronegativity
The difference in electronegativity is large
There is a transfer of electrons

Answer 15

Ionic bond

Question 16

of electron groups: 2

What molecular shape is this:
Lone pair= 0
Electron groups (domains)=2

Answer 16

Linear

Question 17

of electron groups: 3

What molecular shape is this:
Lone pair= 0
Electron groups (domains)=3

Answer 17

Trigonal planar

Question 18

of electron groups: 4

What molecular shape is this:
Lone pair= 0
Electron groups (domains)=4

Answer 18

Tetrahedral

Question 19

What molecular shape is this:
Lone pair= 1
Electron groups (domains)=3

Answer 19

Bent

Question 20

What molecular shape is this:
Lone pair= 1
Electron groups (domains)=4

Answer 20

Trigonal pyramidal

Question 21

What molecular shape is this:
Lone pair= 2
Electron groups (domains)=4

Answer 21

Bent

Question 22

What ratio of ions will be formed in Potassium Oxide (K and O), so that the positively charged ion will cancel out the negatively charged ion?

Answer 22

K2O

Question 23

What ratio of ions will be formed in Calcium Chloride (Ca and Cl), so that the positively charged ion will cancel out the negatively charged ion?

Answer 23

CaCl2

Question 24

Tetrahedral has ___ lone pairs and ___ electron groups (domains).

Answer 24

0; 4

Question 25

Linear has ___ lone pairs and ___ electron groups (domains).

Answer 25

0; 2

Question 26

Trigonal planar has ___ lone pairs and ___ electron groups (domains).

Answer 26

0; 3

Question 27

Bent has 1 lone pair and ___ electron groups (domains).

Answer 27

2

(There are two “bent” geometry structures. This one specifically has 3 domains and 1 lone pair.)

Question 28

Bent has 2 lone pairs and ___ electron groups (domains).

Answer 28

4

(There are two “bent” geometry structures. This one specifically has 4 domains and 2 lone pairs.)

Question 29

Trigonal pyramidal has ___ lone pairs and ___ electron groups (domains).

Answer 29

1; 4