1. Elements, Mixtures & Compounds

2. Where are all elements listed?
The periodic table
What is an element?
An element is a substance that cannot be split into simpler substances by chemical means.
Examples?
Hydrogen (H), Magnesium (Mg), Oxygen (O)

3. What is a compound?
A compound is formed when two or more elements chemically combine.
Examples:
H O H20
Hydrogen + Oxygen Water
Fe S FeS
Iron Sulfur Iron Sulfide

4. What is a mixture?
A mixture is formed when two or more elements are mixed together but not chemically combined.
Examples:
Sand & water
Mixture of iron and sulfur

5. Metals and Non-Metals
Non-Metals
Metals

6. Examples of Metals:
Iron (Fe)
State: Solid
Colour: Grey
Magnesium (Mg)
State: Solid
Colour: Grey

7. Non – Metals
Oxygen (O)
State: Gas
Colour: Colourless
Carbon (C)
State: Solid
Colour: Black

8. When elements take part in a chemical reaction, sometimes they lose their individual properties.
Example:
Hydrogen Oxygen Water
(Gas) (Gas) (Liquid)

9. Carbon + Oxygen Carbon Dioxide
(Black solid) (Gas) (Colourless Gas)
Magnesium Oxygen Magnesium Oxide
(Metal) (Gas) (White powder)

10. Iron + Sulfur Iron sulfide (Metal) (Yellow powder) (Black solid)
Mixture – Iron & Sulfur Chemical reaction Compound – Iron Sulfide