This document introduces elements, compounds, and mixtures. It defines an element as a pure substance made of only one type of atom. Compounds are composed of two or more elements that are chemically bonded together into molecules. Compounds have different properties than their constituent elements. Mixtures are combinations of substances that are not chemically bonded and can be separated through physical means unlike compounds. The document provides examples of elements and properties of metals and non-metals to classify elements and distinguish compounds from mixtures.

1. D O E S I T E V E N M AT T E R ? ?
INTRODUCTION TO
CHEMISTRY

2. ELEMENTS, COMPOUNDS AND
MIXTURES
• An element is a pure substance that cannot be split into
simpler substances.
• An Element contains only One type of particle. A
substance in which there is only one type of particle is a
pure substance. Elements are made of particles called
atoms.
• So in conclusion, an element is a substance made up of only
ONE type of atom.
• An element has characteristic properties such as boiling,
melting points, hardness, density, shine, heat and electricity
conductivity…etc. which can be used to identify it.

3. • What if you entered a
supermarket where
all the goods were
placed in no special
order?
Discuss what would
happen.
Is dividing groceries
into sections or
departments useful?
What advantages do
you get from dividing
groceries into
departments?

4. EXAMPLES OF ELEMENTS

5. MORE ELEMENTS

6. HOW CAN ELEMENTS BE ARRANGED
INTO GROUPS??
How would you classify elements?

7. PROPERTIES OF METALS & NON-METALS
Metals
• 1. Hard, strong
• 2. shiny
• 3. Solid at room
temperature (except
mercury)
• 4. Sonorous
• 5. Good conductor of
heat & electricity
• 6. High density
• 7. Malleable
• 8. Ductile
Non-metals
• 1. Brittle
• 2. Dull
• 3. Some are solids/
liquids/ gases
• 4. Non-Sonorous
• 5. Poor conductor of
heat & electricity
• 6. Low density
• 7. Not Malleable
• 8. Not Ductile

8. COMPOUND
• A compound is a pure substance composed of two or
more elements that are chemically combined.
Elements combine by reacting with one another.
• A particle of a compound is a called a molecule.
• A molecule is two or more atoms chemically bonded
together.
O C O
O S ON O

9. A COMPOUND HAS DIFFERENT PROPERTIES
THAN THE ELEMENTS IT CONTAINS.

10. • A compound can be changed into its elements by
breaking the bonds between the atoms. This is referred
to as a chemical change.
• Heat (thermal energy) or electrical energy can be
used to break down a compound into its elements. This
is called chemical decomposition.
• Example : electrolysis of water
• https://www.youtube.com/watch?v=HQ9Fhd7P_HA
• https://www.youtube.com/watch?v=gZJEDe_HUcw

11. MIXTURE
• A mixture is a combination of two or more substances that
are not chemically combined.
• No Chemical Changes in a Mixture No chemical
changes happen when a mixture is made. So, each
substance has the same chemical makeup it had before the
mixture was formed.
• Mixtures can be separated by physical means.
• Give examples of mixtures you have in your day.
• How can you separate the mixture?

12. CAN YOU USE THE WORDS YOU HAVE
JUST LEARNT TO DESCRIBE A, B AND C?