Learning Outcomes. Through experimentation, I can identify the indicators of chemical reactions having occurred. When two or more elements are joined together during a
chemical reaction, then a new substance called a compound is formed. The new substance usually looks different and behaves in a different way from the elements from which it was made. If elements do not react and are not joined together then a mixture is formed.
Q1. What is formed when two or more elements join together?
Q2. Is the new substance the same or different from
the elements which made it?
Q3. What is formed when the elements do not react
and join together?
Your teacher will demonstrate a chemical reaction between two elements, and you can try one yourself.
The sulphur and
Iron are still
are not joined
They can be
The elements in
The compounds formed in the table have a slightly
different name from the elements from which they
were made. The 1st element keeps its name, but
the 2nd element has some of its end letters changed to
e.g. magnesium and oxygen react to form magnesium
Q4. Name the compound formed in the reaction between Sulphur and Iron.
Iron and Oxygen
Sodium and Chlorine
Copper and Sulphur
Your teacher may let you try the Card
Sort for naming compounds.
Arrange yourselves into groups of 2
Place the cards which have compound
names on the table.
Place the elements which are found in that compound under the compound name.
The chemical reactions can be summarised by using a
Magnesium + Oxygen Magnesium Oxide
Q5. Write down a word equation for the reaction between Iron and Sulphur.
When two or more elements are joined together during a chemical reaction then a new substance called a compound is formed.
If elements do not react and are not joined together then a mixture is formed.
Copper chloride contains copper and chlorine.
Magnesium oxide contains magnesium and oxygen