Unit 6 Exam

Question 1

What does the term “coordination number” in ionic crystals refer to?:

Answer 1

The number of oppositely charged ions around a particular ion.

Question 2

How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?:

Answer 2

3

Question 3

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

Answer 3

It gains electrons

Question 4

What is the electron configuration of the calcium ion?:

Answer 4

[Ar]4s2

Question 5

Ionic compounds are normally in which physical state at room temperature?:

Answer 5

Solid

Question 6

What sub-atomic particle is free to drift in metals?:

Answer 6

Electron

Question 7

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

Answer 7

[Ne]3s2 3p6

Question 8

What is the charge on the strontium ion?:

Answer 8

2+

Question 9

A compound held together by ionic bonds is called a(n)_______:

Answer 9

ionic compound

Question 10

Which of the following is a ternary compound?:
1• NaCl
2• K2O
3• MgCl2
4• RbOH

Answer 10

RbOH

Question 11

How many electrons are transferred from calcium to iodine when forming the compound calcium iodide?:

Answer 11

2

Question 12

Which of the following elements does NOT form an ion with a charge of 1+?:
1• Na
2• K
3• Rb
4• F

Answer 12

F

Question 13

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

Answer 13

Lithium bromide

Question 14

Under what conditions can potassium bromide conduct electricity?:

Answer 14

When it is a liquid, and when it is dissolved in water

Question 15

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

Answer 15

1+

Question 16

What is the maximum charge an anion is likely to have?:

Answer 16

3-

Question 17

What is the electron configuration of the iodide ion?:

Answer 17

[Kr]5s2 4d10 5p6

Question 18

What characteristic of metals makes them good electrical conductors?:

Answer 18

They have free-floating or delocalized electrons.

Question 19

An ionic bond is a bond between ______:

Answer 19

metal and nonmetal

Question 20

What is another name for an ionic compound?:

Answer 20

a salt

Question 21

Which of the following pairs of elements is most likely to form an ionic compound?:
1• Nitrogen and oxygen
2• Magnesium and fluorine
3• Sodium and aluminium
4• Chlorine and fluorine

Answer 21

Magnesium and fluorine

Question 22

What occurs in an ionic bond?:

Answer 22

Electrons are transferred between atoms

Question 23

What is true about the melting temperature of potassium chloride?:

Answer 23

It has a high MP

Question 24

How many electrons are transferred from nitrogen to potassium in the formation of the compound potassium nitride?:

Answer 24

0

Question 25

How many valence electrons are in a silicon atom?:

Answer 25

4

Question 26

What is the net charge of the ionic compound calcium fluoride?:

Answer 26

0

Question 27

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

Answer 27

It loses electrons

Question 28

The octet rule states that, in chemical compounds, atoms tend to have _______:

Answer 28

full outer energy levels and 8 valence electrons

Question 29

The mixture of 2 or more elements, on of which is a metal is called a(n) _______:

Answer 29

Alloy

Question 30

A metal solution containing mercury is known as a(n)_______:

Answer 30

Amalgam