1. Elements, Compounds & Mixtures

2. Elements
An element is a pure substance (only 1 type of particle) that cannot be separated into simpler substances by physical or chemical means.

3. Element

4. Compounds
A compound is a pure substance composed of 2 or more elements that are chemically combined.

5. Hydrogen (H) + Oxygen (O)
Examples of Compounds
Compounds contain elements
The elements combine + lose their original properties
Compounds CAN be separated by chemical means
The elements combine in specific ratios
Sodium (Na) +
Chlorine (Cl)
NaCl
Hydrogen (H) + Oxygen (O)
H2O
Carbon (C) + Oxygen (O)
CO2

6. Mixtures
A mixture is a combination of 2 or more substances that are not chemically combined.

7. Examples of Mixtures Properties of Mixtures:
chicken noodle soup
salad
pizza – yes, that would be Yoda…
Properties of Mixtures:
Each substance in a mixture keeps its identity
You can physically separate them
They also contain elements, compounds, or both
And they can be formed using any ratio of
components

8. Mixtures may be homogeneous or heterogeneous
The prefix “homo” indicates the same
Homogeneous mixtures have the same appearance and properties throughout the mixture
The prefix “hetero” indicates difference
Heterogeneous mixtures consist of visibly different substances

9. There are THREE types of mixtures:
Solutions
Suspensions
Colloids

10. Solutions
A solution is a mixture that appears to be a single substance, but it is actually composed of 2 or more substances that are distributed evenly amongst each other.
SOLUTIONS ARE HOMOGENEOUS
sugar & Kool-Aid powder are dissolved in water
carbon dioxide is
dissolved in water
salt is dissolved in water

11. Suspensions
A suspension is a mixture in which particles of a material are dispersed throughout a liquid or gas, but are large enough that they settle out.
SUSPENSIONS ARE HETEROGENEOUS
That water is disgusting!
muddy water
Italian dressing

12. Colloids
A colloid is a mixture in which the particles are dispersed throughout but are not heavy enough to settle out.
COLLOIDS ARE HOMOGENEOUS
Colloids have properties of both solutions & suspensions.
mayonnaise
milk

13. Comparing Elements, Compounds & Mixtures
What are they made up of?
Can they be broken down? If yes, how?
Do they keep or lose their original properties?
Draw what the particles look like.

14. Identify the following with as many terms as apply
Table salt
Salad
Mayonnaise
Italian dressing
Pepsi
Oxygen
Hydrogen
Water
Mixture
Element
Compound
Suspension
Colloid
Solution
Homogeneous
Heterogeneous