DAY 108

GOALS: SWBAT...

1. define phase change

2. Define terms related to phase change

3. Explore concepts related to phase change

4. Score 90% or higher on the quiz

WARM-UP (4 min)

1. If you put a huge amount of ice (at approx -10*C) and a small amount of liquid water (at 2*C) in a big open container at room temperature, what is the lowest temperature the water will achieve? 

2. Will the liquid water freeze? (hint, think about the ice in the beaker during the phase change lab, and the ice in the spoons from the heat lab) Why/why not? 

3. Define "latent heat"

4. When you boil liquid water, does all the water turn to gas the moment the liquid reaches 100*C (212*F)?

5. Why/why not? 

CLASSWORK

108: Quiz 3: Thermodynamics part 1

108A: Phase Change Vocabulary Concepts (25min)

Continuing from yesterday, watch the video on Evaporation and Condensation, then use it, and your ability to search for information on the internet to find the answers to the following questions. 

1. Define "Phase Change" as it relates to chemistry (easiest to search " phase definition chemistry")

2. The phase of matter depends upon its _________ and the __________that is exerted upon it.

3. Define Evaporation:

4. 3a. Evaporation is a heat (absorbing/releasing) process

5. Heat absorbing/releasing info here:  http://www.theweatherprediction.com/habyhints2/524/

6. Evaporation Video Link: https://www.youtube.com/watch?v=wDYOtu6npNU

7. 3b. Molecules at the surface of a liquid gain enough Kinetic Energy to leave the liquid and become a gas. Where does this energy come from?

8. 3c. How does a canteen stay cool?

9. 3d. How do humans keep cool? How about dogs and pigs?

10. Define condensation:

11. 4a. Condensation is a heat (absorbing/releasing) process.

12. 4b. Where does condensation occur?

13. 4c. Why are steam burns worse than burns from liquids?

14. Define boiling:

15. 5a. Boiling, like evaporation, is a heat (absorbing/releasing) process.

16. 5b. Evaporation takes place at the ____________ of the liquid while boiling takes place _______________________

17.        Great article for finding the answer for 5b: AWESOME LINK

18. 5c. At high altitudes water boils at ____________ temperatures than lower altitudes.

19. Define freezing:

20. 6a. Freezing is a heat (absorbing/releasing) process.

21. 6b. How can you lower the freezing temperature of water?

22. Define melting: 

23. 7a. Melting is a heat (absorbing/releasing) process.

24. Energy must be ______________ ___ a substance to change its phase from a solid to a liquid to a gas. Energy must be ___________ from a substance in order to change phase in the reverse direction.

25. What happens to the temperature of the water while ice is melting?

26. At what temperature does water melt? At what temperature does it freeze?

27. At what temperature does water boil? At what temperature does it condense?

28. List the phase changes (melting, boiling, evaporation, freezing, condensing) below in the correct column:

29.            Heat Releasing (AKA Cooling) Process                          Heat Absorbing (AKA Warming) Process

30. (releases thermal energy into its surroundings)        (absorbs thermal energy from its surroundings)

Exit Questions

1. How did the back of your refrigerator feel?

2. What is the goal of your refrigerator? 

3. The rear portion of the refrigerator (the hot part) is a system of coils called a "condenser". What phase change (aka change of state) do you think is occurring there? Is this a heat absorbing or releasing process?

Learning at Home/HW

1. Define: "latent heat". 

2. Video: How Air Conditioners (and refrigerators) work. This video begins with a pun. Gudani would be proud...

    https://www.youtube.com/watch?v=_-mBeYC2KGc&feature=youtu.be

    Questions:

1. TBD

2. TBD

3. TBD

4. TBD

5. TBD    

3. Lab 4 Heat due electronically Monday - 11:59pm. Work on it at home or during nutrition/lunch

Essential Question: What is Heat?

GOALS: SWBAT...

1. complete both practice quizzes with a score of 95% or higher

WARM-UP (3 min)

1. Heat is the transfer of _____ from one object to another due to a difference in temperature.

2. True or False: Heat and temperature are the same thing.

3. What happens to the molecules of a substance as it gets cooler?

CLASSWORK

Your quiz is tomorrow. Take the following two practice quizzes to review the content we've learned over the past week and a half. 

For each practice quiz, write the number and question in your notebook, then paraphrase the question in your answer. For example, for the warm up, I might write the answer to number 3 like this: "As a substance gets colder, the molecules turn purple and start a disco party." 

108A: Practice Quiz #1: 

    Complete #1-10

    LINK: https://www.ducksters.com/science/quiz/heat_questions.php

    ALTERNATE LINK: https://drive.google.com/file/d/11fdWtyny4h9w_cy2gmlmaBF8tNAHlPUb/view?usp=sharing

108B: Practice Quiz #2: 

    Complete #2-50 (skip 36)

    LINK: https://quizizz.com/admin/quiz/569f9e4032b7545d46f035c7

    ALTERNATE LINK: https://drive.google.com/file/d/1k2E39GgW_trVJkvUKKQKdUhrxSnkWuWf/view?usp=sharing

Learning at Home/HW

1. Complete any test revisions. Question #1 was graded incorrectly, answer is D

2. Quiz Tuesday

3. Lab due Wednesday. Work on it at home or during nutrition/lunch

Whats this? Want to see the answers to the second quiz? Here's a link: http://www.youtube.com/watch?v=cClgBzuNjKc