1. Heat Transfers
Unit 8 I

2. Do Now:
What materials are best for keeping you warm?

3. Heat vs. Temperature Temperature – how hot or cold something is
Measured with a thermometer
Usually measured in Celsius
Heat – a form of energy
Measured in joules
Also called thermal energy

4. https://phet.colorado.edu/en/simulation/energy-forms-and-changes

6. Heat Transfers Atoms want to be happy 
If you combine two materials of different temperatures, the atoms will transfer heat to reach a happy place

7. Activity: Match the temperatures to the object.
Cut out, match and glue into your book.

8. Do Now:
Pick up a worksheet from the table in the front and complete it.

9. Conductors and Insulators
Conductor – lets energy flow through it
Conduction – when energy travels through solids
Example: Saucepans
Insulator – holds heat energy (hot or cold)
Example: Thermos

10. Conductor or Insulator?

11. Heating a Solid:
What happens when you heat a solid?

12. Before the Melting Point:
Particles will get excited (vibrate):
Solid, especially metals will expand
Contracts: gets smaller

13. Do Now:
Review the results from your experiment. How does heat and volume effect the change in temperature after the final liquids are combined?

14. Homework Review
From page 132

15. Changing States of Matter:

16. Phase Change Diagram

17. Activity:
Illustrate a change in matter for water. Label the changes and create a change diagram
Prize to the best poster 

18. Do Now: What do you think of when you hear the word “radiation?”
What is radiation?

19. Radiation Transfer of thermal energy by waves
Infrared Radiation – Energy from the Sun
All hot things emit radiation
When radiation hits things it can be absorbed or reflected

20. Natural or Background Radiation
Radon, a radioactive gas from uranium found in soil
Radioactive Potassium in our food and water;
Uranium, Radium, and Thorium in the Earth's crust;
And from Cosmic Rays and the Sun.

21. Man-made radiation sources
tobacco,
television,
medical x-rays,
smoke detectors,
lantern mantles,
nuclear medicine,
building materials

22. Calculate Your Radiation Exposure

23. Do Now:
Page 128 – Answer Question 3

24. Measuring Radiation
A Geiger counter has a negatively charged Cu tube with a positively charged wire running through it.
The tube is filled with gas at low pressure.
Radiation knocks electrons off the gas which are attracted to the wire producing a current.

25. Measuring Radiation

26. Infrared Images
Pictures that show heat
What is this useful for?

28. Ionizing vs. Non-ionizing

29. Wavelengths Buildings Humans Honey Pen Coin Molecule Atom
Or 3 Foot ball fields Bee Head (side)

30. Dangerous Particles
Alpha radiation is not as dangerous because it is unlikely to reach living cells inside the body.
Beta is slightly more dangerous, as it can penetrate the body and
Gamma radiation is the most dangerous because it can penetrate the skin and damage the cells inside

31. Create Your Own EM Spectrum
Fold a piece of paper into 8 equal pieces, then cut along the center
I will show you how to do it
Front page should include a title and your name
Each page should have 1 part of the electromagnetic spectrum
Include examples for each

32. Do Now:
Visible Light is the only portion of the electromagnetic spectrum we can see. Arrange the following colors in order of largest wavelength to the smallest:
Orange
Indigo
Yellow
Red
Blue
Green
Violet

33. Convection Current What happens when you heat a liquid? Add energy
Liquid will boil

34. Can the entire liquid be at the same temperature?

35. Convection Current Remember learning hot air rises?
Convection Current – movement created by heating a liquid
Hot water rises
Cooler water sinks

36. Where can we see convection currents at work?

37. Convection Currents in the Earth
Convection currents can move the Earth’s plates
Solid rocks constantly heating and cooling cause plates to move
What are the results?

39. Activity:
Wednesday we will complete a lab. We will be heating water and watching the convection current flow with food coloring.
Complete the worksheet by cutting and pasting the statements as you would expect to see in the lab.

40. Exit Ticket
Besides convection currents in the Earth. Describe another convection current you experience in life.