2. Ch 2 Classifying Matter

3. Draw the following chart on your paper make it big enough to fill the page & large enough to write in boxes

4. Matter Pure Substance Matter that always has same composition Mixtures Composition is not fixed

5. Pure Substance Matter that always has exactly same composition ex: salt sugar gold

6. Pure Substance Element Cannot be broken down into simpler substances Compound Made from 2 or more elements

7. Element Atom—the smallest particle of an element Ex: Carbon (C), Oxygen (O), Neon (Ne), Carbon (C), Platinum (Pt), Mercury (Hg)

8. Compound Always joined in a fixed proportion Ex: –Water (H 2 O) –Salt (NaCl) –Steam

9. Mixtures Heterogeneous different parts are noticeably different Homogeneous substances are uniformly distributed

10. Mixture-Homogeneous Homogeneous mixtures contain substances that are uniformly spread out aka: Solution Ex: Vinegar, Syrup

11. Homogeneous Aka: Solution Substances are dissolved

12. Mixture-Heterogeneous Heterogeneous mixtures have easily distinguished parts Ex: –Pizza –Salsa –Chili

13. Heterogeneous Colloid Scatters light & never settles Suspension Separates into layers over time

14. Mixture-Heterogeneous Colloids scatter light & the particles never settle Ex: Milk, smoke, fog Suspensions contain a liquid in which the visible particles settle Ex: OJ, Italian Dressing “shake it, shake it”

15. Separating mixtures Filtration – process of separating a mixture based on particle size ex: coffee filter or air filter Distillation – the process of separating a mixture based on the boiling points of the materials

16. Simple Distillation

17. Law of Conservation of Mass Matter is neither created nor destroyed mass of all substances present before a cc=mass of all substances remaining after change

18. Physical Properties characteristic of a material you can observe w/o changing substances that make up the material

19. Physical Properties 1.Length 2.Temperature 3.Mass 4.boiling point 5.Volume 6.melting point 7.Density 8.conductivity 1.Odor 2.Texture 3.Sticky 4.Solubility 5.Stretchable 6.Luster 7.Taste 8.Magnetic 9.Malleability 10.hard/soft

20. Physical Changes change that does not alter the identity of substances in a material

21. Physical Changes Ex 1. Breaking6. Shredding 2. Pounding7. Crushing 3. Cutting8. Bending 4. Dissolving9. Grinding 5. Folding10.State Changes!?!

22. Chemical Properties-ability to undergo a chemical change Ex: Flammability is the ABILITY to burn (property) not actually being on fire (change)

23. Chemical Properties Reacts w/ light (fading) Flammability Reacts w/ oxygen – rust or tarnish Reacts w/ water Reacts w/ acid Can form a precipitate

24. Chemical Properties- precipitates Lead Nitrate Copper Sulfate

25. PRECIPITATE VIDEO CLIPS http://sciencehack.com/videos/view/pFov lKpPCbIhttp://sciencehack.com/videos/view/pFov lKpPCbI http://www.veoh.com/videos/v273688tM XRPJ7qhttp://www.veoh.com/videos/v273688tM XRPJ7q

26.  Tarnished Copper Tarnished Silver   Rust

27. Chemical Changes change of a substance into new substances Ex 1. Rusting 2. burning 3. Tarnishing 4. formation of a precipitate

28. Chemical Changes *Signs or indicators –Fizzing –Bubbling –color change

29. Form-ing a precipitate

30. STAR Questions List some indicators of a chemical change Fizzing, bubbling, gas, heat, light, precipitate Describe difference between property and change Property is object’s ability to change, a change is action, it’s happening What type of change is evaporating? State changes = physical changes

31. ________Photosynthesis ________Grinding meat into hamburger ________Has a sweet odor ________Drying clothes on a clothesline ________Flammable ________Digestion of food ________Growth of a plant ________Formation of clouds ________Dry ice subliming ________Length of 5 meters