1. What’s in our Air?

2. What’s in our Air?

3. What’s in our Air?

4. Classifying Chemical Substances
PURE SUBSTANCES
MIXTURES

5. Classifying Chemical Substances
Pure substances are composed of only one type of particle.
PURE SUBSTANCES
ELEMENT
Helium Balloon
Helium
Helium
Helium
The balloon only contains
Helium atoms.
Helium
Helium
Helium
Helium
Helium is known as an
ELEMENT.
Helium

6. Classifying Chemical Substances
Pure substances are composed of only one type of particle.
Cup of pure water
PURE SUBSTANCES
COMPOUND
Water (H2O) contains 2 hydrogen
atoms and 1 oxygen atom.
Water is a COMPOUND because elements combine together to form a new substance and cannot be separated back to atoms easily.

7. Classifying Chemical Substances
Pure substances are composed of only one type of particle.
PURE SUBSTANCES
That one type of particle can be made up of either a single element (found on the periodic table), or a compound (more than one element COMBINED together).
ELEMENT
COMPOUND

8. Classifying Chemical Substances
Mixtures are made up of at least two different PURE SUBSTANCES.
Cup of Saltwater +
Salt water contains
salt (sodium chloride: NaCl) and water (H2O).
MIXTURES
=>
=>
Is sodium chloride itself
an element or a compound?
Since salt water contains
salt (pure substance 1) and
water (pure substance 2),
it is a MIXTURE.

9. AIR CONTAINS MORE THAN 5 PURE SUBSTANCES.
What’s in our Air?
AIR CONTAINS MORE THAN 5 PURE SUBSTANCES.

10. Classifying Chemical Substances
PURE SUBSTANCES
ELEMENT
COMPOUND
Let’s develop our understanding of pure substances and mixtures!
MIXTURES