1. Elements, Compounds & Mixtures

2. What is an ELEMENT? A substance composed of a single kind of atom.
Cannot be broken down into another substance by chemical or physical means.

3. Elements

4. What is a MIXTURE?
Two or more substances that are mixed together but are NOT chemically bonded.

5. Mixtures
Physical properties can change, but no new substance is formed
No new chemical bonds are formed
Can be easily separated into distinct parts

6. Examples of Mixtures Properties of Mixtures:
chicken noodle soup
salad
pizza – yes, that would be Yoda…
Properties of Mixtures:
Each substance ikeeps its identity
can physically separate them
Examples: jar of colored jelly beans
trail mix

7. What is a COMPOUND?
A substance in which two or more different elements are CHEMICALLY bonded together.

8. Further Classification of mixtures:
Solutions (homogenous)
Suspensions (heterogenous)

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

10. Mixtures may be homogeneous or heterogeneous
1. Homogeneous mixtures
(prefix “homo” – same)
same appearance
same properties throughout the mixture
2. Heterogeneous mixtures
- visibly different substances
(prefix “hetero” indicates difference)

11. Suspensions
A suspension - 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. Hydrogen (H) + Oxygen (O)
Examples of Compounds
Sodium (Na) +
Chlorine (Cl)
NaCl
Hydrogen (H) + Oxygen (O)
H2O
Carbon (C) + Oxygen (O)
CO2

13. Element

14. Mixtures
combination of 2 or more substances
not chemically combined.

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