Compounds and

equations

Learning Objectives

Level 5…Explain the difference between compounds and mixtures

Level 6…Write word equations

Level 7…Use symbols and work out ratio of elements in a

compound

                                                                                                                             

• When a compound is made a chemical reaction takes place.

• This means the atoms have been joined together.

• It is very difficult to undo this.

• A compound looks very different to the substances it is made of.

+

Making Compounds

REACTION

SULFUR IRON IRON SULFIDE

Making Compounds!

We are now going to react some more elements together...

1.Copper and Sulfur

2.Copper and Oxygen

3.Iron and Oxygen

4.Magnesium and Oxygen

Making Compounds!

We are now going to react some more elements together...

1.Copper and Sulfur Copper Sulfide

2.Copper and Oxygen

3.Iron and Oxygen

4.Magnesium and Oxygen

Making Compounds!

We are now going to react some more elements together...

1.Copper and Sulfur Copper Sulfide

2.Copper and Oxygen Copper Oxide

3.Iron and Oxygen

4.Magnesium and Oxygen

Making Compounds!

We are now going to react some more elements together...

1.Copper and Sulfur Copper Sulfide

2.Copper and Oxygen Copper Oxide

3.Iron and Oxygen Iron Oxide

4.Magnesium and OxygenMagnesium

Oxide

Naming Compounds Sheet

6 minutes

If you finish, carry on with the Periodic Table puzzles sheet

We can also write the compound names using symbols

Copper Sulfide would be CuS

Copper Oxide would be CuO

Word Equations

In Chemistry we use word equations to show what happens in a reaction:

e.g.

Carbon + Oxygen Carbon Dioxide

The substances that are joined are called theREACTANTS

The substances that are made are called the

PRODUCTS

Equation and Symbols Sheet

10 minutesTasks 1& 2 only

If you finish, carry on with the Periodic Table puzzles sheet

Big question…What is the

ratio of elements in a compound?

A bit of maths...Ratios

If there are 7 boys and 11 girls in a class, then we could write this as...

7:11

This is called a ratio.

A bit of maths...Ratios

I have a 3 red pens and 2 black pens.What is the ratio of red to black pens?

3:2

I have a tube of smarties that has 4 red, 6 orange and 7 yellow smarties.

What is the ratio?

4:6:7

Chemical RatiosThe chemical symbol for compounds tells us the ratio of the elements

Copper Chloride has the symbol:

CuCl2

This means there it has:1 copper atom2 chlorine atoms

So the ratio is 1:2

Chemical RatiosHow many atoms of each element are in

CO2

And what is the ratio?

Answer:1 Carbon atom2 Oxygen atoms

Ratio is 1:2

Compounds ratio Sheet

10 minutes

If you finish, carry on with the Periodic Table puzzles sheet

Balancing equation

• Carbon + Oxygen Carbon Dioxide

The substances that are joined are called theREACTANTS

The substances that are made are called the

PRODUCTS

Home work

• Research the components of gases in air

Gases in air % E/C

Learning Objectives

Level 5…Explain the difference between compounds and mixtures

Level 6…Write word equations

Level 7…Use symbols and work out ratio of elements in a

compound

Bingo! Draw a 3 x 3 grid (9 squares)

Carbon nitrogen iron aluminium

potassium chlorine period hydrogen

iodine helium copper calcium

magnesium oxygen mercury fluorine

sulphur alkali group