5.1 All matter is made up of atoms
Matter and Chemical reactions
Learning
intention
To be able to describe a substance as
an atom, element or compound and
identify how many atoms are in each
molecule.
I can classify substances as
element or compound, atom or
molecule
Success
Criteria
I can identify the different
elements in a molecule
I can identify how many different
elements, and how many atoms
of each, in a molecule.
What is an atom?
An atom is…
• The smallest particle of
matter.
Matter is…
• stuff and things. All
substances are matter.
• So… All substances are
made from atoms.
Elements
An element is…
• A substance that is
made from one kind of
atom only.
• It cannot be broken
down into simpler
substances.
Compounds
A compound is…
• A substance made from
more than one kind of
atom.
Molecules
How many atoms are in the
molecule?
• A molecular element is
formed when two or
more atoms of the
same element bond
together.
• A molecular compound
is formed when two or
more atoms from
different elements
bond together.
• The small numbers tell
you how many atoms of
that element are in the
molecule.
Task
1. Group the molecules below into either Molecular elements or molecular
compounds
H2O
H2
CO2
N2
Cl2
HCl
P4
C4H8
S8
2. How many of each element are in each molecule?
Polymers
• Some compounds are molecular,
others are made up of repeating chains
of the same atoms.
• These are called polymers and have a
lattice structure.
• Polymers are used to create plastics.
What properties do plastics have?
Task
• Complete the task on your handout.
• Identify the substances as elements, compounds, molecules and atoms
as required.
• Complete the checkpoint questions–See handout
Homework check
If your answer is correct, give yourself a tick, if your answer needs fixing then do it!
Explain the difference between an element, a mixture and a
compound, use a picture to help in your explanation.
What is the difference between a molecular compound and a
polymer? Use a picture to help your explanation.
Ammonia is a gas that contains molecules with the formula NH3.
What elements are present in ammonia and how many of each
atom is there in each ammonia molecule?
Summarise this lesson into 3 key points.