Unit B Matter and Chemical Change: Section 3.0

Question 1

What is a chemical formula?

Answer 1

A combination of symbols that we use to identify an element

Question 2

What does the chemical formula identify?

Answer 2

The elements in the compound and the amount of each element

Question 3

Why did they create a system to name chemicals?

Answer 3

Because different scientists called it different things and it caused great confusion

Question 4

Who created a naming system for chemicals?

Answer 4

Guyton du Morveau

Question 5

What did Guyton du Morveu decide?

Answer 5

Always put the metal elements first

Question 6

What does IUPAC stand for?

Answer 6

International union of pure and of applied chemistry

Question 7

What does IUPAC do?

Answer 7

They determine the appropriate name for each chemical

Question 8

What do chemical formula’s always end with?

Answer 8

-ide

Question 9

What does the subscript of a chemical formula represent?

Answer 9

the amount of atoms that are present

Question 10

What does no subscript indicate?

Answer 10

Only on atom is present

Question 11

How do you indicate the state of a formula?

Answer 11

By putting a s/l/g in brackets as a subscript

Question 12

What does a subscript (aq) indicate?

Answer 12

That it is dissolved in water

Question 13

How many electrons can fit in the first shell of an atom?

Answer 13

2

Question 14

How many electron can fit in the second shell of an atom?

Answer 14

8

Question 15

How many electrons can fit in the third shell of an atom?

Answer 15

8 or 18

Question 16

What is an ionic compound?

Answer 16

Pure substances formed as a result of the attraction between particles of the opposite charges called ions

Question 17

what is an ion?

Answer 17

An atom that has become electrically charged because it has lost or gained an electron

Question 18

What is a positive ion?

Answer 18

an ion that has lost one or more electron

Question 19

What is a negative ion?

Answer 19

An ion that has gained one or more electron

Question 20

What are polyatomic ions?

Answer 20

A group of atoms acting as one

Question 21

What are the properties of Ionic compounds?

Answer 21

Ions
High melting points
Good conductors
Disting crystal shape
Solids at room temperature

Question 22

What do ions form when they combine?

Answer 22

A crystal

Question 23

Where do you write the ionic charge in a formula?

Answer 23

As a subscript

Question 24

When should you use roman numerals when writing the ion charge?

Answer 24

When it has more than one common ion charge

Question 25

What are the first 10 roman numerals?

Answer 25

1 = I
2 = II
3 = III
4 =IV
5 = V
6 = VI
7 = VII
8 = VIII
9 = IX
10 = X

Question 26

What are oxyanions?

Answer 26

Polyatomic anions containing oxygen

Question 27

What is formed when non-metals combine?

Answer 27

A pure substance called a molecular compound

Question 28

What are the properties of molecular compounds?

Answer 28

• They can be any state at room temperature
• They tend to be poor conductors/ good insulators
• low melting and boiling point

Question 29

Do you use the ion charge when writing molecular compounds?

Answer 29

no

Question 30

What is the exception when writing molecular compounds?

Answer 30

All can be named using scientific names except ones containing hydrogen

Question 31

What are the prefixes when writing molecular compounds?

Answer 31

• mono
• di
• tri
• tetra
• penta