1. Science November 23 rd, 2015

2. WARM UP Bring your notebook, pencil and agenda to your desk Grab a warm up from the white chair Work on Monday’s warm up only ( do not work ahead)

3. Announcements Test on Energy and Heat Transfer Tomorrow Tuesday, November 24 th School holiday for Thanksgiving…. Wednesday, Thursday, and Friday!!

4. Heat Pack Lab review Block 1 only http://www.youtube.com/watch?v=lrCzAGPwcIY

5. Our hand warmers…. Sodium acetate (liquid form) is placed inside pouches containing a metal disc. When you click the metal disc inside the pouch, a few metal particles are released. This causes the sodium acetate to react! This is chemical energy! The sodium acetate quickly change to a solid. This is known as supercooling.

6. Let’s check our understanding… When a liquid changes to a solid does it gain energy or lose energy? It Loses energy….the energy is lost to the environment and we feel this as HEAT on our hands!!!

7. Heat Pack Lab review Block 1 only Sodium acetate heat pads can be used over and over again, simply boiling them will return the solid sodium acetate back to a liquid. This means it is ready to be used again. Pretty cool…. http://www.youtube.com/watch?v=lrCzAGPwcIY

8. Heat Transfer “Hot to Cold” –write in notebook and color using blue and red crayons Energy (heat) ALWAYS flows throughout materials or across space from hot to cold

9. Mr. C “Hot to Cold” Hot to Cold video Music video

10. Let’s see if we understand… A block of ice is on a hot sidewalk. The ice melts because…. heat is moving from _______________ to _________________ (type of thermal energy transfer is _____________) A cold ice pack is placed on an injured elbow. The energy is moving From _________________ to the ___________________ (type of thermal energy transfer is ______________) Sun shines on the pavement and the pavement gets hot. This is showing energy transfer from _____________ to ________________. (type of thermal energy transfer is_______________)

11. Let’s see if we understand… A block of ice is on a hot sidewalk. The ice melts because heat is moving from the hot sidewalk to the ice. (type of thermal energy transfer is conduction) A cold ice pack is placed on an injured elbow. The energy is moving From the injured elbow to the ice pack (type of thermal energy transfer is conduction) Sun shines on the pavement and the pavement gets hot. This is showing energy transfer from electromagnetic to thermal. (type of thermal energy transfer is radiation)

12. Thermal Equilibrium…Write this calculation down Hot water temperature = 90⁰ C (red container) Cold water temperature = 20 ⁰ C (blue container) If we mixed these two liquids together, what would be the equilibrium temperature? How do you know?

13. Share with the Class? Volunteers? The hot water would rise up and mix with the cold water forming convection currents. The two liquids would continue to mix until they reached an equilibrium temperature of 55⁰ C (equal temp) 90 ⁰ C + 20 ⁰ C / 2 = 55 ⁰ C Equilibrium occurs when 2 objects reach the same temperature

14. Convection in the atmosphere !

15. Write in notebook: Convection causes winds to circulate between the equator and the poles

16. It’s Demo Time Conduction, Birthday Candle and a Metal Rod

17. It’s Demo Time If I lay one end of a metal rod onto a hot plate, do you think I would be able to melt a wax birthday candle? (in the middle of the rod away from the hot plate?) Why or why not? Yes, heat from the hot plate is conducted through the metal rod to the birthday candle causing it to melt

18. “Fill in the Blank” activity You will receive a worksheet and a word bank to complete the station If you do not finish, complete for homework tonight while studying for the QUIZ!

19. Bill Nye Energy Worksheet (if needed)