3.1 Formulae and Chemical Equasions

Question 1

Non-metals and hydrogen form __ and their names __.

Answer 1

Anions and their names end in -ide.

Question 2

Metals form __ and their names __.

Answer 2

Cations and their names are the same as the element.

Question 3

Naming an ionic compound:

Answer 3

(Metal) (Non-metal) (-ide suffix)

Question 4

Naming a non-metal compound:

Answer 4

(Hydrogen if present) (Element with lowest group number) (Other element) (-ide suffix)

Question 5

Molecular compound formulas show __.

Answer 5

The type and number of each atom in one molecule.

Question 6

Ionic compound formulas show __.

Answer 6

The type and ratio of ions in the compound.

Question 7

What is valency?

Answer 7

A measure of how many bonds an atom can form - the ammount of electrons that an atom can gain, lose or share to form a compound.

Question 8

What is the valency of the electrons in the groups of the periodic table?

Answer 8

I - 1
II - 2
III - 3
IV - 4
V - 3
VI - 2
VII - 1
VIII - 0

Question 9

Finding formulas using valency:

Answer 9

The amount of atoms needed is the other elements valency.

Question 10

Name the diatomic elements:

Answer 10

• Hydrogen (H2)
• Nitrogen (N2)
• Flourine (F2)
• Oxygen (O2)
• Iodine (I2)
• Chlorine (Cl2)
• Bromine (Br2)