1. What’s the MATTER, Properties of Matter

2. Matter, Properties of Matter At the conclusion of our time together, you should be able to: 1. Explain the difference between the extensive and intensive properties and other types of properties 2. Distinguish between a physical property and chemical property

3. Too late to learn this stuff???

4. The Nature of Matter Chemists are interested in the nature of matter and how this is related to its atoms and molecules. GoldMercury

5. Chemistry & Matter  We can explore the MACROSCOPIC world — what we can see —  to understand the PARTICULATE worlds we cannot see.  We write SYMBOLS to describe these worlds.

6. A Chemist’s View 2 H 2 (g) + O 2 (g) --> 2 H 2 O(g) MacroscopicMacroscopic SymbolicSymbolic ParticulateParticulate

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8. Properties of Matter  2 Types: Extensive – depend on the amount of the sample Always involves a number with unit Examples =volume mass length

9. Properties of Matter (cont.) Intensive – does not depend on the amount of the sample Usually does not involve a number Examples =density melting, boiling point malleability ductility color odor

10. Properties  Every substance has a unique set of properties (characteristics that identify that substance)  Physical Properties- Properties that can be measured without changing the identity and composition of the substance

11. Physical Property Examples- Color Odor Density Melting Point Boiling Point Hardness Solubility

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13. Graphite — this layer structure of carbon atoms reflects its physical properties. List Some Physical Properties of:

14. Chemical Properties  Properties that describe the way a substance may change to form other substances  Only observed when a chemical reaction takes place

15. Chemical Property Examples  Combustible  Reactive with water or acid  Flammable  Corrosive  Decomposes in air

16. Do I Have to Learn this Stuff???

17. Physical vs. Chemical Properties  Physical Properties- Properties that can be measured without changing the identity and composition of the substance  Chemical Properties- Properties that can be measured by changing the identity and composition of the substance

18. Matter, Properties of Matter Let’s see if you can: 1. Explain the difference between the extensive and intensive properties and other types of properties 2. Distinguish between a physical property and chemical property

19. Design a Hypothesis

20. Properties of Matter  2 Types: Extensive – depends on the amount of the sample Intensive – does not depend on the amount of the sample

21. Physical vs. Chemical Properties  Physical Properties- Properties that can be measured without changing the identity and composition of the substance  Chemical Properties- Properties that can be measured by changing the identity and composition of the substance

22. Physical vs. Chemical Property  Examples: melts at 55 o F flammable will tear easily will dissolve in water will tarnish physical chemical physical chemical

23.  Examples: will rust mixture can be separated by boiling burns freezes at -20 o C can be crushed Physical vs. Chemical Properties chemical physical chemical physical

24. Familiar Saying A rotating lithoidal fragment never accrues lichen. A rolling stone gathers no moss!!