1. Mixtures And Solutions

2. Mixtures
Two or more substances combined.
Easy to separate
Physical properties do NOT change when mixed (physical properties maintained)

3. More examples of mixtures are .....
????

4. Solution
Two or more substance combined and dissolved
Substances spread evenly to create new substance
Hard to separate
Physical properties do change when mixed

5. Solution
Examples:
Sugar + water
Coffee + water
Lemon juice + water

6. More Examples ??

7. If a substance can dissolve it is SOLUBLE
Soluble – ability to dissolve in water
Examples:
Sugar, salt, coffee, etc.

8. Want to know how? SEPARATION
Can you separate the salt from water once its been mixed?
Want to know how?

9. Adding Heat
Once you add heat, the liquid (water) turns to water vapor and evaporates. But the salt crystals are left behind.
You can separate solutions by heating them and evaporating the water!!

10. INVESTIGATION Materials: Salt, Sugar, Sand, Water, Filter Paper
Today you will investigate 3 different materials, sugar-sand-salt. You will add 3 spoonfuls of each to 100ml of water. Then you will stir each for 30 seconds.
Finally, you pour the mixture through a coffee filter into an empty cup. What happened to the salt? Sugar? Sand?

11. YOUR TURN
One way to separate salt from water is to boil the water. But we can also do it another way.
Mix together salt and water, stirring so that the solution is good. Then add drops of food coloring.
Use your solution to paint a picture on a large sheet of white paper. When it dries, you will have beautiful salt crystals all over your painting! Why? Because the water evaporates but the salt will remain!