chemistry (2 assignment)

____

1.

What is the name given to the electrons in the highest occupied energy level of an atom?

a.

orbital electrons

c.

anions

____

2.

b.

valence electrons

d.

cations

How does calcium obey the octet rule when reacting to form compounds?

a.

It gains electrons.

b.

It gives up electrons.

c.

It does not change its number of electrons.

____

3.

d.

Calcium does not obey the octet rule.

What is the charge on the strontium ion?

c.

a.

2 –

1

____

4.

b.

1 –

d.

2

How many electrons does barium have to give up to achieve a noble-gas electron configuration?

a.

1

c.

3

____

5.

b.

2

d.

4

What is the formula of the ion formed when potassium achieves noble-gas electron configuration?

a.

K 2 

c.

K 1 −

____

6.

b.

K 

d.

K 2 −

Which of the following ions has a pseudo-noble-gas electron configuration?

a.

Fe 2

c.

Cu 

____

7.

b.

Mn2

d.

Ni 

Which of the following elements does NOT form an ion with a charge of 1?

a.

fluorine

c.

potassium

____

8.

b.

hydrogen

d.

sodium

What is the charge on the cation in the ionic compound sodium sulfide?

a.

0

c.

2

____

9.

b.

1

d.

3

Which of the following occurs in an ionic bond?

a.

Oppositely charged ions attract.

b.

Two atoms share two electrons.

c.

Two atoms share more than two electrons.

d.

Like-charged ions attract.

a.

2 –

c.

0

b.

1 –

d.

1

Name: ______________________

____

11.

How many valence electrons are transferred from the nitrogen atom to potassium in the formation of

the compound potassium nitride?

c.

a.

0

2

____

12.

b.

1

d.

3

How many valence electrons are transferred from the calcium atom to iodine in the formation of the

compound calcium iodide?

c.

a.

0

2

____

13.

b.

1

d.

3

What is the formula unit of sodium nitride?

a.

NaN

c.

Na 3 N

____

14.

b.

Na 2 N

d.

NaN3

What is the formula unit of aluminum oxide?

a.

AlO

c.

AlO3

____

15.

b.

Al 3 O

d.

Al 2 O 3

What is the name of the ionic compound formed from lithium and bromine?

a.

lithium bromine

c.

lithium bromium

____

16.

b.

lithium bromide

d.

lithium bromate

What is the formula for sodium sulfate?

a.

NaSO4

c.

Na(SO 4 ) 2

____

17.

b.

Na 2 SO 4

d.

Na 2 (SO 4 ) 2

What is the formula for potassium sulfide?

a.

KS

c.

KS 2

____

18.

b.

K 2 S

d.

K 2 S2

Which of the following pairs of elements is most likely to form an ionic compound?

a.

magnesium and fluorine

c.

oxygen and chlorine

____

19.

b.

nitrogen and sulfur

d.

sodium and aluminum

Which of these elements does not exist as a diatomic molecule?

a.

Ne

c.

H

____

20.

b.

F

d.

I

How do atoms achieve noble-gas electron configurations in single covalent bonds?

Name: ______________________

ID: A

____

22.

Which of the following elements can form diatomic molecules held together by triple covalent bonds?

a.

carbon

c.

fluorine

____

23.

b.

oxygen

d.

nitrogen

Which of the following is the name given to the pairs of valence electrons that do not participate in

bonding in diatomic oxygen molecules?

c.

a.

unvalenced pair

inner pair

____

24.

b.

outer pair

d.

unshared pair

Which of the following diatomic molecules is joined by a double covalent bond?

a.

O 2

c.

N 2

____

25.

b.

Cl 2

d.

He 2

A molecule with a single covalent bond is ____.

a.

CO 2

c.

CO

____

26.

b.

Cl 2

d.

N 2

Once formed, how are coordinate covalent bonds different from other covalent bonds?

a.

They are stronger.

c.

They are weaker.

b.

They are more ionic in character.

d.

There is no difference.

____

27.

When H  forms a bond with H 2 O to form the hydronium ion H 3 O  , this bond is called a coordinate

____

28.

Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen?

a.

C

c.

O

____

29.

b.

Na

d.

S

Which of the following covalent bonds is the most polar?

a.

H—F

c.

H—H

____

30.

b.

H—C

d.

H—N

What causes hydrogen bonding?