Ionic Compounds Chemical Formulas_Key Questions

Question 1

Write the name of the following compound - Li2O

Answer 1

Lithium Oxide

Question 2

Write the name of the following compound - Ba(NO3)2

Answer 2

Barium Nitrate

Question 3

Write the name of the following compound - PbBr2

Answer 3

Lead (II) Bromide

Question 4

Write the name of the following compound - (NH4)3PO4

Answer 4

Ammonium Phosphate

Question 5

Write the name of the following compound - FeCO3

Answer 5

Iron(II) Carbonate

Question 6

Write the name of the following compound - Al2O3

Answer 6

Aluminium Oxide

Question 7

Write the name of the following compound - ZnCl2

Answer 7

Zinc Chloride

Question 8

Write the name of the following compound - Na2SO4

Answer 8

Sodium Sulfate

Question 9

Write the formula for the following compound - copper(II) fluoride

Answer 9

CuF2

Question 10

Write the formula for the following compound - lithium nitrate

Answer 10

LiNO3

Question 11

Write the formula for the following compound - potassium sulfide

Answer 11

K2S

Question 12

Write the formula for the following compound - magnesium nitrite

Answer 12

Mg

Question 13

Write the formula for the following compound - iron (III) hydroxide

Answer 13

Fe(OH)3

Question 14

Write the formula for the following compound - zinc nitride

Answer 14

ZN3N2

Question 15

Write the formula for the following compound - lead(II) dichromate

Answer 15

PbCr2O7

Question 16

Write the formula for the following compound - Mercury(II) sulfide

Answer 16

HgS

Question 17

Write the formula for the following compound - ammonium hydrogen sulfate

Answer 17

NH4HSO4

Question 18

Write the formula for the following compound - Sodium Hydrogen Carbonate

Answer 18

NoHCO3

Question 19

Give the formula of the anion in the following compound - calcium oxalate CaC2O4

Answer 19

C2O42-

Question 20

Give the formula of the anion in the following compound - potassium arsenate K3AsO4

Answer 20

AsO43-

Question 21

Give the formula of the anion in the following compound - magnesium iodate Mg(IO3)2

Answer 21

IO3-

Question 22

Give the formula of the cation in the following compound - rubidium carbonate Rb2CO3

Answer 22

Rb+

Question 23

Give the formula of the cation in the following compound - cadmium nitrate Cd(NO3)2

Answer 23

Cd2+

Question 24

Give the formula of the cation in the following compound - scandium chloride ScCl3

Answer 24

Sc3+

Question 25

How do you name a ionic compound?

Answer 25

The name of a positively charged metal ion (cation) is the same as the name of the metal.

Question 26

For simple non-metal ions (anions), the name of the ion is similar to that of the atom, but what does it end in?

Answer 26

ide

Question 27

For polyatomic anions containing oxygen, what will the name of the ion will usually end in?

Answer 27

‘-ite’ or ‘-ate’.

Question 28

How do you create a chemical formula containing polyatomic ions?

Answer 28

- If different elements are present, then they are combined in a fixed ratio. - The group of atoms behaves as a single unit with a specific charge. - Subscripts are used to indicate the number of each kind of atom in the ion. - Example: a carbonate ion, CO32-

Question 29

What happens to the formula if more than one polyatomic ion is required to balance the charge?

Answer 29

Then it is placed in brackets with the required number written as a subscript after the brackets. - Example: magnesium nitrate, Mg(NO3)2

Question 30

What are the two types of Crystalline Solids?

Answer 30

Crystalline and Amorphous

Question 31

Describe Crystalline Solids

Answer 31

``` - Arranged in a regular manner – definite shape – Sharp (definite) melting point – Rigid – Break into pieces with plane surfaces – clean clevage (break into pieces with plane surfaces) ```

Question 32

Describe Amorphous Solids

Answer 32

- Irregular in arrangement; can exist in different states and do not have a definite melting temperature – rigid and cannot be compressed – give an irregular clevage

Question 33

What is a Crystal Lattice?

Answer 33

The arrangement of ions in a regular, geometric structure is called a crystal lattice.

Question 34

What are Hydrated Ionic Compounds?

Answer 34

- Sometimes water molecules become trapped within the ionic lattice. - These compounds are called hydrates, and produce water when they decompose upon heating.

Question 35

How is a formula written for Hydrated Ionic Compounds?

Answer 35

- When the formula of a hydrated compound is written, the number of water molecules is also included, but separated from the ionic formula by a full stop. - Example: Iron(II) sulfate octahydrate is written as FeSO4.8H2O