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# Describing matter chapter 1 section 2

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### Describing matter chapter 1 section 2

1. 1. Warm-Up<br />Talk to the person who sits next to you about your mystery object.<br />Write a description of this object on the note card as if you were describing it to an alien. Do NOT tell what the object is, but rather describe anything you can about it.<br />We will read some and try to guess what <br />the objects are.<br />
2. 2. Describing Matter<br />Chapter 1; Section 2<br />Pages 11-19<br />
3. 3. Physical Properties Identify Matter<br />Are the socks clean?<br />Will all my books fit?<br />Which blouse will you wear with this skirt?<br />
4. 4. Physical Properties<br /><ul><li>Observed or measured without changing the ________ of the matter.</li></ul>Identity<br />mass<br />Odor<br />volume<br />Color<br />
5. 5.
6. 6. Examples of Physical Properties:<br />Thermal Conductivity<br />Heat<br /><ul><li>Ability to move/transfer ________energy</li></ul>Good conductor: transfers thermal energy to cook food!<br />Poor conductor: hot chocolate does not burn your hand!<br />
7. 7. Examples of Physical Properties:<br />State of Matter<br /><ul><li>The physical form of a substance;</li></ul> __________, ___________, _____________.<br />solid<br />liquid<br />gas<br />
8. 8. Examples of Physical Properties:<br />Malleability<br />hammered<br /><ul><li>Able to be _______________ into sheets</li></ul>***Think of mallet <br />
9. 9. Ductility<br />Examples of Physical Properties:<br />pulled<br /><ul><li>Able to be _________________ into wire.</li></li></ul><li>Solubility<br />Examples of Physical Properties:<br />dissolve<br /><ul><li>Ability to _______________</li></li></ul><li>Examples of Physical Properties:<br />Density<br />Mass<br />Volume<br /><ul><li>__________ per unit ____________.
10. 10. How tightly packed the molecules are
11. 11. D=m/v</li></ul>Q: Which is more dense? Why?<br />
12. 12. Question:<br />If D=m/v, looking at the picture of the golden colored nugget on page 13 of your book, find the density and tell if that nugget is gold or iron pyrite.<br />How did you know?<br />
13. 13. How to tell if an egg is rotten…<br />by Scott Mathews<br />Can you eat that egg?<br />If not sure you ought-ter,then place it in water. If it lies on its side, then it's fresh; eat with pride.<br />After three or four days, at an angle it lays. But, it still is a treat,so go on and eat.<br />Ten days, stands on end,in your baking 'twill blend.'Cause it's definitely edible,in your baking, incredible.<br />But, if it floats on the surface,that egg serves no purpose. 'Cause a floater's a stinker! Out the back door best fling 'er!<br />
14. 14. Homework: Give another example of each of these six physical properties in your chart.<br />
15. 15. Warm-Up<br />LOGIN TO THE COMPUTER…<br />What is density?<br />What is the formula for finding density?<br />
16. 16. Warm-Up<br />Make some observations about the steel balls<br />What do you think will happen when they are dropped in water?<br />Why is 1 floating while the other sank?<br />
17. 17. Warm-Up<br />Make some observations about the 2 tubes.<br />Why do they look different? (what is probably different about the 2 tubes?)<br />
18. 18. Warm-Up<br />Make some observations about the bottle.<br />Describe what is happening in the bottle.<br />
19. 19. Review: Give another example of each of these six physical properties in your chart.<br />(This was hw last week)<br />
20. 20. Chemical Properties<br /><ul><li>Cannot easily be ____________
21. 21. Show how an object can _________</li></ul>observed<br />change<br />EXAMPLES:<br />
22. 22. Physical VS Chemical Properties<br /><ul><li>Look at the chart on page 16 of your textbook:</li></ul>What do you notice when you compare the chemical and physical properties of the substances?<br />
23. 23. Physical Changes<br /><ul><li>Don’t _____ with ______ substances
24. 24. Often __________ to undo</li></ul>end<br />new<br />easy<br />EXAMPLES:<br />
25. 25. Chemical Changes<br /><ul><li>_______ with ______ substances
26. 26. ______ cannot be __________</li></ul>End<br />new<br />Often<br />undone<br />EXAMPLES:<br />
27. 27. Warm-Up<br />****TAKE OUT YOUR ½ SHEET REVIEW!! <br />Why does 1 soda float while the other sinks?<br />
28. 28. Review Answers <br />B-physical change<br />Use the drain.<br />Mass per unit volume<br />Denser sink less dense float<br />1 g/mL<br />Sink; its D=2 g/mL which is more than water<br />NO; D is how tight the molecules are. Cutting it does not change that. It changes mass AND volume. D is a constant.<br />
29. 29. Chemical vs. Physical Changes<br />
30. 30. Place these in your chart and explain…<br />Burning paper<br />Cutting wire into 5 pieces<br />Ice melting in a glass of soda<br />Chlorophyll in a leaf changes the color of the leaf<br />Adding food coloring to make icing blue<br />Burning gasoline inside a car engine<br />Dissolving sugar in iced tea<br />Spilled gasoline evaporates<br />Silver coin tarnishes in the air<br />
31. 31. Chemical vs. Physical Changes<br />
32. 32. Homework: Give another example of each type of reaction in your chart.<br />
33. 33. Warm-Up<br />What are physical properties?<br />What are 3 different examples of physical properties of matter? (describe each)<br />
34. 34. Water<br />vinegar<br />Iodine<br />Baking Powder<br />Baking Soda<br />Cornstarch<br />Sugar<br />
35. 35. Warm-Up<br />What is the difference between a chemical property and a physical property?<br />What are some chemical properties?<br />
36. 36. Demos… (Before)<br />Water<br />Vinegar<br />Make some qualitative observations.<br />What do you think will happen? Explain.<br />
37. 37. Demos…<br />Before<br />After<br />Make some qualitative observations.<br />What happened? Explain.<br />
38. 38. Re-read page 19 in your textbook and look at the second chart for “White Before Your Eyes”.<br />Make sure you have the correct changes, chemical or physical, and the correct properties, reactivity or solubility.<br />
39. 39. Warm-Up<br />Is it a chemical or physical change when you make scrambled eggs? Why?<br />If I mix baking soda with vinegar and a gas is produced, is that a chemical or physical change? Why?<br />
40. 40. Demos…(After)<br />Water<br />Vinegar<br />Make some qualitative observations.<br />What happened? Why?<br />
41. 41. Warm-Up<br />What is the difference between a chemical change and a physical change?<br />
42. 42. Warm-Up<br />Take out your “Describing Matter Review Sheet” (its ½ sheet of paper)<br />What are 2 things you learned in this section?<br />What is 1 thing you don’t understand?<br />
43. 43. Demos…<br />What is happening in the flask? Why-is it a chemical change or a physical change? Explain.<br />
44. 44. Warm-Up<br />If I find the density of an object and then cut that object in half, what happens to the density of the new objects? Explain.<br />
45. 45. Warm-Up<br />Why did the bubbles float in the aquarium experiment?<br />Which of the silver balls do you think has a greater density (the larger or the smaller)? Why?<br />