Elements, mixtures and atoms

What is an element

An element is a substance that only contains one type of atom, it is found on the periodic table

What does each element have

Each element has it’s own unique chemical symbol which is the same in every language, these are also found on the periodic table

What is the smallest thing an element can be broken down into

An atom is the smallest part of which an element can be broken down into

What does it mean if there are 100 different elements

As there are around 100 types of elements that can occur naturally, there are around 100 different atoms

How are compounds formed

Compounds are formed when two or more different elements chemically bond together

What will a compound have different properties to

The compound will have different physical properties to the elements which make up the compound, for example water is a liquid but it is made from oxygen and hydrogen which are both gasses

What do you need to do to separate a compound

Compounds are hard to separate and need a chemical reaction to do this

How do you name a compound

When naming a compound, we always mention the metal first and the non metal second

What does not change when naming a compound

The name of the metal will not change but the name of the non metal will, for example oxygen can change to oxide

What do chemical formulae tell us

Chemical formulae tells us how many atoms of each element are in the compound in relation to each other

In a chemical formula what does the small number tell us

The small number tell us us the number if each element which is in front of the number

What is a molecule made up of

A molecule is made up of 2 or more atoms. These can be the same type or different

What is helium

Helium is a gas it is made up of atoms

What are H20 or water molecules made of

Water molecules are made up of two elements, hydrogen and oxygen

What is the ratio for water

Water has a specific ratio of two hydrogen atoms to one oxygen atom

What are carbon dioxide molecules made up of

Carbon dioxide molecules are made up of two elements carbon and oxygen

What is the ratio for carbon dioxide

carbon dioxide has a specific ratio is one carbon atom to two oxygen atoms

What can a particle diagram of a mixture have

A particle diagram of a mixture can include atoms and molecules, but they are not bonded together