1. Elements, Compounds and Mixtures
Notes # 6

2. Elements
Are pure substances that can’t be changed into simpler substances.
Made of only one type of atom
The number of protons in the nucleus is what makes each element unique and different from all other elements
Elements are listed on the Periodic Table of Elements

3. Element examples:

4. Compounds
Are pure substances that are made of two or more types of elements
They are chemically combined in a specific ratio
For example: H2O water is always 2 Hydrogen atoms and 1 Oxygen atom
Compounds can only be separated back into simpler elements by chemical change

5. Compound examples

7. Mixtures
Are made of two or more different substances that are only physical combined (not chemically bound)
They do not have a specific ratio
They can be separated by a physical change: filtering, sifting, evaporation, magnetism
There are two types of mixtures: heterogeneous and homogeneous.
Prefix hetero means different
Prefix homo means same

8. Mixtures
Heterogeneous mixture: not uniform throughout, you can see the individual parts
Examples: trail mix, soil, salad
Homogeneous mixture: is uniform throughout, you can not see the different substances
Examples: blood, ocean water, kool-aid, soda