1. Lab #8 Heat and Temperature: There is a Difference! Ms. Twardowski – Science Central Middle School 8 Tan

2. Heat Energy You already know that Heat Energy (HE) is a form of Kinetic Energy (KE). It can be defined as: The collective (sum) amount of the KE in an object. Just add together ALL the KE! P.S. – even “cold” things have Heat Energy! You already know that Heat Energy (HE) is a form of Kinetic Energy (KE). It can be defined as: The collective (sum) amount of the KE in an object. Just add together ALL the KE! P.S. – even “cold” things have Heat Energy!

3. Temperature Temperature, however, is DIFFERENT than Heat. Temperature can be defined as: The hotness (large amount of HE) or coldness (smaller amount of HE) of an object. Temperature, however, is DIFFERENT than Heat. Temperature can be defined as: The hotness (large amount of HE) or coldness (smaller amount of HE) of an object.

4. Frayer Model So now, in your journal, make a Frayer Model for the words HEAT and TEMPERATURE. Here are the definitions, again: So now, in your journal, make a Frayer Model for the words HEAT and TEMPERATURE. Here are the definitions, again: Heat: The collective (sum) amount of the KE in an object. Just add together ALL the KE! Heat: The collective (sum) amount of the KE in an object. Just add together ALL the KE! Temperature: The hotness (large amount of HE) or coldness (smaller amount of HE) of an object. Temperature: The hotness (large amount of HE) or coldness (smaller amount of HE) of an object.

5. Lab 8 In this lab we will learn more about the transfer of heat through a liquid AND a solid. This is called __________ and __________. (I’m waiting for you to fill in the blank with the correct term). In this lab we will learn more about the transfer of heat through a liquid AND a solid. This is called __________ and __________. (I’m waiting for you to fill in the blank with the correct term).

6. But, first… You need to learn another term. Thermal Equilibrium! Say it with me now… You need to learn another term. Thermal Equilibrium! Say it with me now… Thermal Equilibrium is defined as: The condition under which two substances in physical contact with each other exchange no heat energy. Two substances in thermal equilibrium are said to be at the same temperature. (Write this down!) Thermal Equilibrium is defined as: The condition under which two substances in physical contact with each other exchange no heat energy. Two substances in thermal equilibrium are said to be at the same temperature. (Write this down!)

7. For example: If we combined HOT tea and ICED tea into ONE cup, eventually the HOT tea would get __________ (starts with a “c”) and the ICED tea would get __________ (starts with an “h”). When the temperature of the cup with the “new” solution stopped changing, it is said to have reached T_____ E_____ (take a guess!) If we combined HOT tea and ICED tea into ONE cup, eventually the HOT tea would get __________ (starts with a “c”) and the ICED tea would get __________ (starts with an “h”). When the temperature of the cup with the “new” solution stopped changing, it is said to have reached T_____ E_____ (take a guess!) BTW, what’s the difference between a mixture and a solution??? (DCAS Review) BTW, what’s the difference between a mixture and a solution??? (DCAS Review)

8. OH!... A Thermometer (thermo means “heat” and meter means “measure”) measures HEAT ENERGY. It rises and falls, expands and contracts depending on how much KE is detected. Then, you read the temperature. The earliest thermometer (air- thermometer) was invented by Galileo in 1597! A Thermometer (thermo means “heat” and meter means “measure”) measures HEAT ENERGY. It rises and falls, expands and contracts depending on how much KE is detected. Then, you read the temperature. The earliest thermometer (air- thermometer) was invented by Galileo in 1597!

9. Lab 8 You will need: You will need: 1 cup of water with ICE in it. 1 cup of water with ICE in it. 1 cup of hot water (yes, it’s really hot!) 1 cup of hot water (yes, it’s really hot!) 1 large cup with room temperature water. 1 large cup with room temperature water. 3 thermometers. 3 thermometers. NO HORSEPLAYING ! ! !

10. What to do…Part A (NO thermometers). Place a finger from one hand in the ice water. Place a finger from one hand in the ice water. Place a finger from the other hand in the hot water. Place a finger from the other hand in the hot water. After about 15-30 seconds take both fingers out and QUICKLY put BOTH into the ROOM TEMPERATURE water. After about 15-30 seconds take both fingers out and QUICKLY put BOTH into the ROOM TEMPERATURE water.

11. Part B…Put thermometers in each cup (turn them on)! First, record the temperature of the ice water. First, record the temperature of the ice water. Next, record the temperature of the hot water. Next, record the temperature of the hot water. The big cup is has Room Temperature water in it. Put BOTH thermometers in the big cup. The big cup is has Room Temperature water in it. Put BOTH thermometers in the big cup. When the thermometer readings stop changing, record the temperatures. When the thermometer readings stop changing, record the temperatures.

12. After-Lab Notes: Heat ALWAYS transfers from the “hotter” object to the “colder” object. ALWAYS, ALWAYS, ALWAYS…that’s just the way it is! (Write this down!) Heat ALWAYS transfers from the “hotter” object to the “colder” object. ALWAYS, ALWAYS, ALWAYS…that’s just the way it is! (Write this down!) Take a frozen candy bar and your hand… Take a frozen candy bar and your hand…

13. So…: Would the Heat Energy transfer from: Would the Heat Energy transfer from: Your hand to the candy bar, or Your hand to the candy bar, or The candy bar to your hand? The candy bar to your hand? Write your group’s answer on the whiteboard. Write your group’s answer on the whiteboard.

14. You’re standing outside on a summer day. It is 100 F outside! Would the Heat Energy transfer from: Would the Heat Energy transfer from: Your body to the air particles, or Your body to the air particles, or The air particles to your body? The air particles to your body? Write your group’s answer on the whiteboard. Write your group’s answer on the whiteboard.

15. You’re standing outside on a winter day. It is 32 F outside! Would the Heat Energy transfer from: Would the Heat Energy transfer from: Your body to the air particles, or Your body to the air particles, or The air particles to your body? The air particles to your body? Write your group’s answer on the whiteboard. Write your group’s answer on the whiteboard.

16. You’re holding a hot cup of coffee! Would the Heat Energy transfer from: Would the Heat Energy transfer from: Your body to the coffee, or Your body to the coffee, or The coffee to your body? The coffee to your body? Write your group’s answer on the whiteboard. Write your group’s answer on the whiteboard.

17. So, in OUR lab… With your finger in the hot water, the heat would transfer from _____ to _____. With your finger in the hot water, the heat would transfer from _____ to _____. (draw/label this picture in your journal) With your finger in the ice water, the heat would transfer from _____ to _____. With your finger in the ice water, the heat would transfer from _____ to _____. (draw/label this picture on your worksheet) What happens in the big cup with BOTH fingers in the water-Part 2?...(draw/label) What happens in the big cup with BOTH fingers in the water-Part 2?...(draw/label)

18. Review: Complete with your shoulder partner WITHOUT talking to the other partners across from you! What is the difference between heat and temperature? What is the difference between heat and temperature? Explain the heat transfer in the cup of ice water and your finger. In addition, you can use the labeled drawing. Explain the heat transfer in the cup of ice water and your finger. In addition, you can use the labeled drawing. Explain the heat transfer in the cup of hot water and your finger. Can use a labeled drawing. Explain the heat transfer in the cup of hot water and your finger. Can use a labeled drawing.