1. Substances/Mixtures

2. 1. Examine the objects in the beaker. 2. Sort them into groups. 3
1. Examine the objects in the beaker. 2. Sort them into groups. 3. Each item should be grouped with similar items. 4. Describe the difference between the unsorted beaker and the sorted groups of objects In your own words, define a pure substance and a mixture.

3. What are pure substances?
Pure substance = Matter that contains only one type of particle.
Examples
Elements like hydrogen and oxygen
Compounds like water (when pure not tap)

4. What are pure substances?
Characteristics
The particles cannot be separated by physical means
Every sample has the same properties
Every sample has the same ratio of atoms

5. What are pure substances?
Kitchen Evaporated sea water Underground mine
NaCl NaCl NaCl
1: : :1
Crystal Crystal Crystal
Clear/White Clear/White Clear/White
Melts at 801oC Melts at 801oC Melts at 801oC

6. What are mixtures?
Most things in the world are not pure, instead they’re mixtures
Mixture = Matter made of two or more pure substances that are not chemically combined

7. What are mixtures? Characteristics
Usually easy to separate into its components
Each pure substance in a mixture keeps its own properties
The parts of a mixture are not combined in a set ratio

8. What are mixtures? Characteristics
Usually easy to separate into its components
Each pure substance in a mixture keeps its own properties
The parts of a mixture are not combined in a set ratio

9. Two types of Mixtures Heterogeneous You can see the different parts
Examples: soil and salad

10. Two types of Mixtures Homogeneous
Evenly mixed so that you can’t see the different parts (uniform)
Example: sugar dissolved in water

11. Two types of Mixtures Homogeneous Another example is a solution
Salt dissolving in water (solid in a liquid)
Nitrogen dissolving in oxygen (two gases)
Copper dissolving in zinc (two liquefied metals)

13. Pure substances vs. Homogeneous vs. heterogeneous
What’s what?
Pure substances vs. Homogeneous vs. heterogeneous

14. Chicken soup

15. Lemonade

16. Steel

17. Gold

18. Chunky peanut butter

19. Blood

20. Chocolate chip cookie

21. Sugar

22. Air

23. Coffee