1. TOPIC: Heat AIM: How does heat affect molecules?
Date #
Assignment
Mon
Tues 12
Textbook page 259 #2,3,4
Wed 13
Textbook page 265 # 1,2,3
Thurs 14
Textbook page 270 # 1-4
Fri 15
Textbook page 282 # 1-13
Write out questions

2. Molecules
Tiny particles that make up matter

3. Example:
1 molecule of water = H2O
5 molecules of water

4. Molecules are always moving which produces heat
The more heat that is contained the
faster the molecules move

5. HEAT Energy caused by the internal motion of molecules (friction)
Energy moves from warm areas to areas that are cooler

6. Kinetic Theory of Matter
Matter is made of molecules that are always in motion which collide & transfer their Kinetic Energy

8. Temperature The amount/quantity of heat an object contains
Measure of average Kinetic energy of molecules

9. Analyzing relationships
If heat is added to an object the molecules move ________, which _________ the Kinetic Energy, which causes the temperature to _________.
faster
increases
increase

10. Low temp = slower moving
High temp = fast moving

11. FASTER

12. 70°F
70°F
The pail of water has fewer molecules in it than the ocean does. Even though they may be the same temperature, the pail of water has less heat than the ocean.

13. The __________________
Instrument used
For measuring
Temperature is
The __________________
thermometer

15. Heated
Liquid level
rises
Cooled
Liquid level
drops

16. Thermal Expansion Increase in size of a substance caused by heat
Temp increases makes molecules move faster & farther apart

18. Spaces between the joints allow the metals in the bridge to expand.

19. Hot air balloons rise because heated air expands

20. Fahrenheit Scale °F
Non-metric temperature scale

21. Fahrenheit Facts Water freezes = 32°F Water boils = 212°F
Human body temp = 98.6°F

22. °C
Celsius Scale
Metric temperature scale

23. Celsius Facts Water freezes = 0°C Water boils = 100°C
Human body temp = 37°C

24. Kelvin Scale °K
Metric temperature scale
Units = Kelvins

25. Kelvin Facts Absolute Zero = 0K when molecules stop moving
Only exists in space

28. Conversions
°C  K
Celsius + 273K

29. K  °C
Kelvin - 273

30. 400 – 273 =
127 °C
Example
400K ? °C

31. =
329K
Example:
56°C = ? K

32. CALORIES unit of heat 1 calorie = 4.184 J
How is
heat
measured?
CALORIES
unit of heat
1 calorie = J
Amount of heat needed to raise the temp of 1g of water 1°C

33. 1000 calories (1 kilocalorie) = 1 food Calorie

34. Your body uses the calories in food for heat and energy
Your body uses the calories in food for heat and energy. Some foods contain more calories than others, and therefore provide your body with a concentration of energy. Foods that are high in calories contain large amounts of chemical energy, often more than your body can properly break down and use. What's left over is often stored as fat. That's why people on diets avoid foods that are high in calories.

36. When both ball and ring are at room temperature, the ball fits through the ring.
When the ball is heated, it no longer fits due to thermal expansion.