1. CHEMISTRY Chapter 1: Introduction Section 2: Describing matter

2. Objectives 1.2 Identify and describe physical and chemical properties. List four observations that a chemical change has occurred. Distinguish between characteristics of matter.

3. Physical Properties Can be observed without affecting composition Color, Odor, Texture, Density, All Phase change properties Can only be observed by changing the composition Reaction with oxygen, other chemicals; Combustion Chemical Properties

4. Physical Changes Do not affect composition http://rds.yahoo.com/_ylt=A0WTefVLmtNIxGoBkb6jzbkF/SIG=12mo9nise/EXP=1221913547/**http%3A//www.chemcool.com/regents/physicalbehaviorofmatter/aim10.htm

5. Physical Change Physical changes include: Changing the shape or size Dissolving Changing from one state of matter to another

6. Examples of Physical Change water evaporating or water changing to steam clothes drying in a dryer chopping wood - wood ground to sawdust erosion rock breaking mixing Kool-Aid

7. Chemical Changes DO affect composition http://i.treehugger.com/files/th_images/burning.car.500-thumb.jpg

8. Copyright © by Houghton Mifflin Company 2-8 Electrolysis, the decomposition of water by an electric current, is a chemical process.

9. Examples of Chemical Changes fruit rotting, food spoiling rust decay of plants burning wood silver tarnishing car burning gas baking bread

10. Clues that a chemical reaction has occurred Color change http://z.about.com/d/chemistry/1/G/5/a/demonstration.jpghttp://z.about.com/d/chemistry/1/G/5/a/demonstration.jpg http://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gif http://www.speedysigns.com/images/decals/400c/Speedy/SHAPES/NOSYMBL.gi fhttp://upload.wikimedia.org/wikipedia/commons/e/eb/Diffusion.gif

11. Clues that a chemical reaction has occurred SOLID forms http://educ.queensu.ca/~science/main/concept/gen/g09/N.%20Sabet/precipitation.jpg http://upload.wikimedia.org/wikipedia/commons/archive/1/16/20080308013811!Chemical_precipitation_diagram.png http://www.therealmartha.com/Holidaze02/snoman_stop_messin_head.jpg

12. Clues that a chemical reaction has occurred Bublé

13. Clues that a chemical reaction has occurred Bubbles form http://eco-centric.blogspot.com/2007/03/bubble-bubble-toil-and-trouble.html http://mrfun5anddirtshorts.files.wordpress.com/2008/06/picture-10.png?w=375&h=341&h=341

14. Clues that a chemical reaction has occurred Heat and/or flame is produced or absorbed http://www.skimarket.co.uk/images/accessories/handwarmer.jpg http://livetardy.com/wp-content/gallery/individual-pics-2007/ice-freezing-up-02.jpg

15. Chemical Equations Reactants react (START) – Left Products form (END) - Right http://www.cartage.org.lb/en/themes/Sciences/Chemistry/Inorganicchemistry/chemicslformula/Equation/chemicalequation/FG03_003.GIF S (s) Solid (l) Liquid (g) Gas (aq) Aqueous

16. Units Base Metric Units Length : Meter Mass: Gram Volume: Liter Temperature: Kelvin – bit different Byte Watt Etc

17. Mass Mass is amount of stuff (quantity of matter) Weight = mass x gravity

18. Volume 8 oz = 1 cup 2 cups = 1 pint 2 pints = 1 quart 2 quarts = ½ gallon 2 (½ gallons) = 1 gallon If you have 4.79 oz, how many gallons do you have? Quarts? Pints?

19. Volume If you have 4.79 L, how many mL do you have? cL? kL? 4790 mL 479 cL 4.79 x 10 -3 kL

20. NO MORE INCHES!! Estimated digit = 4 in hundredths place

21. Density Amount of matter in volume D = M V

22. Hi. I’m Important! BIGGER SMALLER http://sub.allaboutcircuits.com/images/00356.png

23. Review 1.2 List four observations that a chemical change has occurred. Evolution of a gas Formation of a precipitate Release / Absorb energy Color change Distinguish between characteristics of matter. Mass Volume Differentiate between physical and chemical changes Physical does not change composition; chemical does

24. Homework Read 1.2 (Chapter 1, section 2) Copy Table 3 into your class notebook