C1.2.3 - Chemical Formulae

Question 1

Name the following compound:

CO₂

Answer 1

Carbon dioxide

Question 2

What does a chemical formula tell us?

Answer 2

the relative number of atoms of each element in a compound.

Question 3

Name the following compound:

CO

Answer 3

Carbon monoxide

Question 4

Identify the ratio of elements in the following compound:

Al₂O₃

Answer 4

Aluminium atoms 2: Oxygen atoms 3

Question 5

What does the _subscript tell us in a chemical formula? e.g. CO_₂_

Answer 5

How many atoms of the element are present in a compound.

e.g. CO_₂ _contains 2 oxygen atoms

Question 6

Identify the ratio of elements in the following compound:

H₂O

Answer 6

2 Hydrogen atoms: 1 Oxygen atom

Question 7

Identify the ratio of elements in the following compound:

CO₂

Answer 7

1 Carbon atom : 2 Oxygen atoms

Question 8

Name the following compound:

Al₂O₃

Answer 8

Aluminium oxide

Al₂O₃

Question 9

Name the following compound:

H₂O

Answer 9

Water

Question 10

All of the chemical symbols are organised into a table called…

Answer 10

the periodic table