1. Chapter 5 Section 2

2. 1. Which physical property allows objects to be attracted to iron? 2. Why does a golf ball sink and ping pong ball float? 3. Which physical property allows Christmas lights to work? 4. Why do we use metal pans to cook food? magnetism density Electrical conductivity Good conductors of thermal heat

3. Today we will: Discuss the physical property solubility, boiling point, melting point, and specific heat. Demonstrate how different materials are soluble, have different melting point, boiling point, and specific heat. Homework: Begin to study for your quiz. It will be Friday. Chapter 5 Section 2

4. http://sreeramchemicals.com/Images/TopImages/pic_chemical s.jpg http://romunov.blogsome.com/images/kozarec.jpg Ability of substance to dissolve in a liquid Solutes =what is being dissolved Solvent= what does the dissolving Alka seltzer in water Food color Kool-Aid

5. Different substances dissolve at different rates and at different temperatur es.

6. http://www.bing.com/images/search?q=solute&view=detail&id =1130B85499C14E793483370E3C77664CF68F7288 http://www.saskschools.ca/curr_content/chem30_05/4_solutions/solut ion3_1.htm Let’s Practice

7. 1. About how much KNO 3 dissolves at 80 ⁰ C? 2. How much NaNO 3 is present at 0 ⁰C? http://gcserevision101.files.wordpress.com/2009/02/solu bility-curves.jpg 130 g 75 g

8. http://www.sciencegeek.net/Chemistry/taters/solubili ty.htm http://img.youtube.com/vi/hydUVGUb yvU/0.jpg Let’s Practic e Log on to my google webpage for a link for more practice. Chapter 5 Science Resources

9. http://image.tutorvista.com/content/heat/pure-water-boiling- point.jpeg http://discover.edventures.com/images/termlib/b/boiling_point/supp ort.gif http://www.infoplease.com/images/ESCI041HYDBON002.jpg http://www.hyvac.com/images/Water/Water%20Boil%200 01.jpg Temperature at which a solid begins to boil or make bubbles.

10. When a liquid is heated, it eventually reaches a temperature at which the vapor pressure is large enough that bubbles form inside the body of the liquid. This temperature is called the boiling point. Once the liquid starts to boil, the temperature remains constant until all of the liquid has been converted to a gas. http://chemed.chem.purdue.edu/genchem/topicreview/bp /ch14/melting.php#boil http://www.factmonster.com/images/ESCI041HYDBON002.jpg

11. http://spacesciencegroup.nsula.edu/lessons/graphics/celsiusscale.jp g http://www.elmhurst.edu/~chm/vchembook/163boilingpt.html http://www.wildbackpacker.com/backpacking-food/articles/high- altitude-cooking/

12. http://apollo.lsc.vsc.edu/classes/met130/notes/chapter4/graphics/sv p_boiling_point.jpg http://www.wviz.org/psi/video_student/point What is the boiling point of water? 100 ⁰C or 212 ⁰F

13. http://hypertextbook.com/facts/2003/JessicaCheung.shtml http://thumbs.dreamstime.com/thumb_2/11011211137LQGhL.jpg Temperature at which a solid melts to become liquid. http://www.easynotecards.com/print_list/1577 What is the freezing point of water? 0 ⁰C or 32⁰ F

14. http://www.chemistryland.com/CHM130/IconSpecificHeat.jpg http://www.csulb.edu/~rtoossi/PhysicsBook/book/Chap17- Heat&Temperature/Multimedia/images/heat-capacity.gif http://www.cpchem.com/enu/docs_pao/SpecificHeat.JPG Amount of energy it takes for a substance to raise 1kg of a substance by 1 o C

15. http://www.chemistryland.com/CHM151S/06- Thermochemistry/Energy/EnergyUnitSpecificHeat.html http://hendrix2.uoregon.edu/~imamura/102/section3/ch apter15.html Which would have a high specific heat? Water or a metal seat belt? Water

16. http://www.mrsciguy.com/referencetables/specificheat.jp g http://images.wikia.com/schools/images/8/82/Specific_h eat_table.JPG http://www.chemistryland.com/CHM151S/06- Thermochemistry/Energy/EnergyUnitSpecificHeat.html What is the specific heat of iron? Iron has a specific heat of.45

17. A water molecule, a commonly-used example of polarity. The two charges are present with a negative charge in the middle (red shade), and a positive charge at the ends (blue shade).water molecule

18. A water molecule is composed of two hydrogen atoms and one oxygen atom. Notice that one side of the molecule has a positive charge and the other side has a negative charge. The molecule has poles! Water is Polar!

19. Because water molecules are polar, they are attracted to each other like tiny magnets. This gives water special properties. Let’s Experiment

20. Polarity is charge inequality on two ends of any molecule. Due to the unequal distribution of electrons in water molecule, one part of the molecule is more negatively charged than the other part. This is caused by the property of 'electronegativity', which can be defined as ability of an element to attract electrons. If the atoms that make up a molecule have different electronegativities, that differ substantially, they attract electrons unequally, causing polarity. http://www.buzzle.com/articles/polari ty-of-water.html http://www.physicalgeography.net/fun damentals/images/water.JPG

21. Station 1: Solubility graph worksheet. Complete the worksheet with your partner. Read pages 162- 163. List and describe the physical properties used to identify a substance.

22. Station 2: Log on to my webpage. Go to Science Resources Chapter 5 Resources Click on the solubility link. Work through the 12 solubility questions. Record your answers in your notebook.

23. Station 3: Physical properties review. Log on to mimio from my webpage and complete the physical properties assignment.