2. Matter Matter Video Matter Video

3. Lesson Goals and Objectives You will learn about the three states of matter You will learn what physical changes are and how matter can change from one state to another. You will learn how chemical changes can cause some kinds of matter to become new matter.

4. Matter Matter is everything around you. Matter is anything made of atoms and molecules. Matter is anything that has a mass.

5. Atom The smallest particle that can still be identified as the matter it came from is an atom

6. Three State of Matter Solid Liquid Gas Online Demonstration

7. SOLIDS

8. SOLID A solid is matter that has that has definite size and shape. Molecules are held close together and there is very little movement between them. Example: Put a sneaker in a box. It stays the same.

9. Liquids

10. LIQUID A liquid takes the shape of any container. Atoms and molecules have more space between them than a solid does, but less than a gas (ie. It is more “fluid”.) Example: Pour juice into a glass. The juice will take on the shape of the glass.

11. GAS

12. Gas Gas is matter that has no definite shape. Gases take the shape of whatever container they are in. Molecules are moving in random patterns with varying amounts of distance between the particles. Example: The air all around us is a gas.

13. All matter, regardless of state, undergoes physical and chemical changes. These changes can be microscopic or macroscopic.

14. A physical change occurs when the substance changes state but does not change its chemical composition. For example: water freezing into ice, cutting a piece of wood into smaller pieces, etc. The form or appearance has changed, but the properties of that substance are the same (i.e. it has the same melting point, boiling point, chemical composition, etc.)

15. Physical Changes Breaking Crushing Cutting Bending Melting Freezing Boiling Can happen naturally People can cause changes –Water evaporating –Rain falling and causing puddles –People cause change Recycling paper Recycling metal

16. Physical Change Freezing water is a physical change because it’s still water if it’s frozen or liquid (it’s the same junk!!)

17. PHYSICAL CHANGES

18. A chemical change occurs when a substance changes into something new. This occurs due to heating, chemical reaction, etc. You can tell a chemical change has occurred if the density, melting point or freezing point of the original substance changes. Many common signs of a chemical change can be seen (bubbles forming, mass changed, etc).

19. You can’t go back to the original substances after a chemical change (reaction) has occurred!! Baking soda reacting w/ vinegar Burning wood

20. Chemical changes in matter New Matter is formed. –Burning –Rusting –Cooking

21. CHEMICAL CHANGES

22. Let’s watch a video clip about matter! States of Matter

23. Is this a solid, a liquid, or a gas? Can you find more than one type of matter in any of the pictures?

24. Is this a physical change or a chemical change? Can you find more than one physical or chemical change in the pictures?

25. Conservation of Matter Chemical changes don’t make new matter The total mass of the products that form equals the total mass of the substances that react. There is no observable change in the quantity of matter during a chemical reaction or a physical change. In other words, matter cannot be created nor destroyed. It is just converted from one form to another

26. Quick Review What is a physical change? A physical change is a change in the size, shape, state, or appearance of matter. What is a chemical change? A chemical change causes matter to become a new kind of matter.

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