2. I can define temperature and heat and can describe the transfer of heat. Based on what you learned last week, how well can you: Define heat? Define temperature? Describe how heat is transferred? 2 Temperature

3. Temperature is proportional to the average translational kinetic energy of the atoms and molecules make up the substance. Temperature is not a measure of the total kinetic energy in a substance. Temperature is not a measure of total thermal energy.

4. What can you tell me about temperature scales based on our activity? 4

5. 5 Temperature Temperature is a quantity that corresponds to degree of hotness on a chosen scale. A thermometer takes advantage of the fact the most substances expand with temperature. A thermometer measures temperature by comparing the expansion or contraction of a liquid (red alcohol) in increments on a scale.

6. 6 Temperature The Celsius temperature scale is the scale used most often in the world today. The scale is named after Anders Celsius who first suggested that a scale with 100 º between the freezing and boiling point of water would be a good idea.

7. 7 Tempe rature The Fahrenheit temperature scale is the scale commonly used in the US. On the Fahrenheit temperature scale, water freezes at 32 º and boils at 212º.

8. True or false: Cold is the absence of fast-moving molecules. False; cold refers to very slow-moving molecules, not their absence.

9. Is there an absolute upper limit and lower limit temperature? What would an maximum temperature be measuring? Is there a point where the particles couldn’t move any faster? Theoretically, temperature has no upper limit.

10. What would an minimum temperature be measuring? Is there a point where the particles couldn’t move any slower – that is they are stopped? Yes! The absolute lower limit for temperature is called Absolute Zero The particles have lost all their kinetic energy and can’t get any colder

11. The Kelvin temperature scale was developed to help explain the relationship temperature and kinetic energy (movement) 0 Kelvin (K) is Absolute Zero 273 K is the melting point of water (0º C) 373 K is the boiling point of water (100º C)

12. Do you think it is possible to convert a temperature measured on one scale to a different scale? Yes! You just need to use an algebraic equation to convert from one scale to the other.

13. ºC = 5/9 (ºF - 32) ºC = K + 273

14. Mark your calendar! Today’s learning goal: I can define temperature and heat and can describe how temperature scales are used. Using the scale, how do you think you are doing with the concept?

15. Heat is transferred between objects. Thermal energy moves from high temperature to low temperature. 15 Temperature

16. What does equilibrium mean? Thermal Equilibrium = 16 Temperature

17. First Law: When heat flows into or out of a system, the gain or loss of thermal energy equals the amount of heat transferred. 17 Temperature

18. First Law: Heat/energy is neither created or destroyed 18 Temperature

19. Second Law: Heat never spontaneously flows from a lower-temperature substance to a higher-temperature substance. 19 Temperature

20. Second Law: Heat moves from hot to cold. 20 Temperature

21. Third Law: No system can reach absolute zero. 21 Temperature

22. 3 types: Conduction Convections Radiation 22 Temperature

23. 1 Temperature

24. http://www.youtube.com/watch?v=7Y3mfAGVn 1c 24 Temperature

25. 25 Temperature

26. 26 Temperature Endothermic Reaction- Energy (Heat) is absorbed in the reaction, “It feels cold when you touch it!” Exothermic Reaction- Energy (Heat) is released in the reaction, “It feels hot when you touch it!”

27. Mark your calendar! Today’s learning goal: I can define temperature and heat and can describe the transfer of heat. Using the scale, how do you think you are doing with the concept? 27 Temperature