The document discusses physical properties of matter and mixtures. It provides examples of mixtures, such as salad and cereal, which maintain the physical properties of their ingredients. Solutions are described as a special type of mixture where one substance dissolves evenly in another. Common tools that can separate mixtures include filters, magnets, and evaporation.

1. TEKS 5.7B The student knows that matter has physical properties. The student is expected to demonstrate that some mixtures maintain the physical properties of their ingredients

2. What are some physical properties of matter? Color Texture Odor Conducts heat Conducts electricity Magnetic Floats or sinks Solubility Boiling point Melting point Mass

3. Mixtures Form when two or more substances combine Keep their physical properties Can be separated by their physical properties Do not form a new substance

4. Salad is an example of a mixture The lettuce and vegetables do not change when mixed

5. Is cereal a mixture? Yes…the properties of the substances do not change. You can still see the bananas, cereal, and milk.

6. Is cake a mixture? No…the properties of the substances change. The eggs, flour, and sugar change when the cake is mixed and baked.

7. Substances in a mixture can be separated by their physical properties… Milk and cereal can be separated by pouring the mixture through a strainer.

8. The cereal would be trapped in the strainer and the milk would pass through.

9. QUESTION: How could you separate a mixture of sand and sawdust?

10. ANSWER: You can separate the sand from the sawdust by adding water. The sand will sink and the sawdust will float. Sawdust Water Sand

11. QUESTION: Which scientific tool could you use to separate a mixture of iron filings and sand?

12. ANSWER: You can separate the iron filings from the sand by using a magnet. Iron filings

13. Solutions are a special kind of mixture One of the substances dissolves in another The substance spreads out evenly Solutions may be clear or colored

14. You can make a solution when you stir sugar into water. The sugar dissolves and the water remains clear.

15. Do all substances dissolve? No…if you mix sand with water, the sand does not dissolve but settles on the bottom of the glass. Sand + water

16. All solutions are mixtures but not all mixtures are solutions Sugar + Water = ? Mixture and a solution Sand + Water = ? Mixture but not a solution

17. Other examples of solutions: Soda = Gas + Liquid Jewelry = Solid + Solid Air = Gas + Gas

18. Solutions can be separated Most solutions can be separated by evaporation. To separate a saltwater solution, let the water evaporate. Once the water is gone, the salt will be left.

19. Challenge You are given a mixture of salt, sand, and gravel. Design a plan to separate this mixture? What tools would you use? List your steps in order.