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Day 1 – 1/28/14 & 1/29/14

Day 1 – 1/28/14 & 1/29/14. A. B. What is temperature?

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Day 1 – 1/28/14 & 1/29/14

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  1. Day 1 – 1/28/14 & 1/29/14 A B What is temperature? 2. Above are 2 samples of a substance. The arrows represent the movement of the molecules. You are asked to determine which has a higher temperature but do not have a thermometer. Which one do you think has the greater temperature? How do you know?

  2. Day 2: 1/30/14 & 1/31/14 • Touch the inside of a 200°C hot oven and you burn yourself. But, when the 1200°C white hot sparks from a 4th-of-July type sparkler hit your skin, you’re okay. Why? • What is heat?

  3. Day 3: 2/3/14 & 2/4/14 • List the following temperatures from coldest to warmest: 80°C, 200 K and 50°F. Explain your answer. • Fill in the change in temperature for each sample below.

  4. Day 4: 2/5/14 & 2/6/14 • Sample A has an initial temperature of 66°C and Sample B has an initial temperature of 88°C. They are then mixed together and reach the same final temperature. • Which sample will gain heat? • How do you know? • A hot rock is placed into a cool bucket of water. The rock experiences a -41°C temperature change and the water experiences a +3°C temperature change. • Which sample, if any, had the greatest heat transfer? • Explain your answer to part A. Bonus: For question #1, explain what is happening during the mixture of these samples on the molecular level using scientific vocabulary correctly.

  5. Day 5: 2/7/14 & 2/10/14 • A sample of each metal shown in the table to the left is formed into a cube of 50 kg. If each sample loses 100 J of heat, which sample will cool the most? Explain. • A sample of zinc experiences a decrease in temperature of 30°C when it is placed in a sample of water. • If the water gains 40,000 J during this process, what is the heat transfer for the zinc? • What is the mass of this sample of zinc? Show your work.

  6. Day 6 – 2/11 & 2/12 • None (heat quiz)

  7. Day 7 – 2/13 & 2/18 • Is it possible to change the temperature of a gas without adding heat or removing heat from the gas? If so, how? If not, why not? • Is it possible to add or remove heat from a gas and not change the temperature of the gas? If so, how? If not, why not?

  8. Day 8 – 2/19 & 2/20 • How do you know if… • Internal energy changed for a gas? • Work is done ON a system? • Work is done BY a system? • Mary states that in order for heat to be exchanged between two substances they need to be in contact and at different temperatures whereas Jane states that the two substances only need to be at different temperatures to exchange heat. Who is correct and why? Bonus: Explain why your bag of potato chips expands (and almost pops) when going over Donner Pass on the way to Reno (use complete sentences)

  9. Day 9 – 2/21 & 2/24 • What would have to happen to a gas if it was absorbing heat from the surroundings but also experiencing a negative temperature change? Fill out the following table to help you analyze, then answer the question. • A gas undergoes a thermodynamic process where 1000 J of work are done on the system and while 500 J of heat are removed. • What is the change in internal energy during this process? • Did the temperature of the gas increase or decrease? How do you know?

  10. Day 10 (even) – 2/26 • Describe how the 1st Law of Thermodynamics is representative of the law of conservation of energy. • Describe how the heat engine equation is representative of the law of conservation of energy.

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