HW #6 for 6/2

1) HW #6: pg. 354-6 #27-28, 48, 50 pg. 357 #4-5
2) Late HW #1-6 due Fri. 6/3, textbooks due 6/3

HW #5 for 5/31

1) HW #5: pg. 333 #3-6
2) Late HW #1-7 due Fri. 6/3, textbooks due 6/3

HW #4 for 5/26

1) HW #4 pg. 694 #14-15, 25-26
2) Composition book due this Fri 5/27
3) Late HW #1-7 due Fri. 6/3

HW #3 for 5/24

1) HW #3—pg. 678 #3b-c, 5-6, pg. 694 #12, 13b-c
2) Composition book due this Fri 5/27

HW #2 for 5/23

HW #2
1) HW #2 pg. 213 #51, 52

HW #1 for 5/19

1) HW #1 pg. 210 #14 a-b, d, g, 15, 16
2) Bonus Lab due 5/233) Make up one take home lab #4-6 by 5/234) Math/Science night 5/19 4:30-6:30
5) Late HW #13-24 due 5/23

The Big Melt Article

Article: The Big Melt

Question: Are there measures that we can take to reduce glaciers melting around the world? What would be the most effective course of action?

1. Hypothesis: We will have “glaciers” covered in nothing, plastic wrap, black construction paper and aluminum foil that will be placed in the sun.  Which glacier will melt the fastest? Slowest? Explain your reasoning.

2. Opening photos (pg. 14-15). Describe the photos on these pages.

3. Explain how what you see in the photos relates to the article text.

4. Map (pg. 16). Describe the map.

5. Explain how the map connects to information in the text.

6. Describe the graph.

7. Explain how the information in the graph supports the article text.

8. Which visual element do you think best supports the central idea of the article? Explain your answer.

Post-demonstration:

9. Which ice cube melted the most? The least?

10. Based on your observations, which of the materials you tested would make the best blanket to prevent a glacier from melting?

11. What other materials would you suggest that we test? Explain why you would want to test these materials.

HW #23 for 5/12

Go to this website: Science World Magazine

1) Then click on the sign in button
2) Enter this password for our class: CottaS303 (make sure to use CAPITAL letters for C and S)
3) Then scroll through the issues for the magazine for December 9, 2013 with the shark eating a sea creature on the cover
4) Then click on the digital issue and look for the article in class that we read entitled "The Big Melt" on pg 14-17
5) After reading, look at page 14 for the box that says "Click for 4 bonus skills sheets" and click on it.
6) Go to the third page of the skills sheets entitled "Freed from the Ice" and answer those five questions on a separate sheet of paper.

HW #22 for 5/10

Visit this website:

EPA Climate Change for Students

Then complete the expeditions for these spots on the map.
1) Arctic Ocean
2) Midwest U.S.
3) Great Barrier Reef
4) Maldives

On your paper, write the answers (from questions or games) from the videos that you watch for each spot on the map. Each spot on the map has 2-3 questions. Then give the code for when you finished that spot on the map.

HW #21 for 5/9

Visit this website about climate change and answer the following questions:

http://climatekids.nasa.gov/menu/big-questions/

Go to the section: " What can we do to help?"
1. What are the three things that you can do when you get older? Which would you be most willing to do?
2. What are three things you can do to reduce your "carbon footprint"? Which one you be willing to do right now to help out?
3. Name three ways to reduce your trash contribution. What is the easiest one to do?
4. Take the carbon footprint calculator on this website:  carbon footprint calculator.
5. Then tell how many tonnes of CO2 are released from your activities and how many Earths we would need if every lived like you.

HW #20

Visit this website about climate change and answer the following questions:

http://climatekids.nasa.gov/menu/big-questions/

Go to the section entitled: "What is the big deal with carbon?"
1. Explain how carbon, the element, is different than when it is in a compound with other elements.
2. Explain how oil and natural gas are formed in our Earth.
3. Explain what is good and what is bad about the greenhouse effect.

Go to the section entitled: "What is happening in the ocean?"

4. Explain how relationship between algae and coral is beneficial to each species.

5. How are ocean animals that have shells and corals affected by the changing ocean.

6, What is more dense: hot or cold ocean water? What effect does salt have on density?

HW #19 for 5/2

Answer on a piece of separate piece of paper:

Identify each of the following changes as chemical or physical.  If it is a physical change give the name of the change of state.  Then identify if it is an exothermic or endothermic reaction. :

1.) Solid iodine turns directly into gaseous iodine when left on your table.
2.) Solid sodium hydroxide mixes with liquid water and the mixture turns very hot.
3.) A cold pack is activated by a packet of liquid water is burst open and mixed with solid ammonium nitrate and immediately turns cold.
4.) Outside a bottle of water is left out and turns to gaseous water.
5.) Then overnight, the weather turns cold and the gaseous water forms frost on the plants outside.
6.) A cake is mixed and cooked in the oven for Mother's Day.
7.) Special sun paper is left outside in the sun and it turns to a different color.
8.) Steam collects underneath the lid of a pot and turns to water drops.

HW #18 plus extra credit opportunity

Go to this website: Science World Magazine

1) Then click on the sign in button
2) Enter this password for our class: CottaS303 (make sure to use CAPITAL letters for C and S)
3) Then look at the recent issues for the magazine for April 18, 2016 with the melting ice on the cover
4) Then click on the digital issue and read the article in that magazine entitled: "Massive Meltdown" on page 8-11.
5) After reading, look at page 9 for the box that says "Click for 4 bonus skills sheets" and click on it.
6) Go to the first page of the skills sheets entitled "Explore an Article" and answer those five questions on a separate sheet of paper.

For EXTRA CREDIT:
1) Go to the May 9, 2016 issue with octopus on the cover
2) Page 20-22 of the issue
3) Read the clues to uncover the mystery element
4) Answer what the element is and the five questions on page 22 on a separate sheet of paper

If you have problems, e-mail me: julianne.cotta@lausd.net

HW #17 for 4/25

Go to this website: Science World Magazine

1) Then click on the sign in button
2) Enter this password for our class: CottaS303 (make sure to use CAPITAL letters for C and S)
3) Then look at the recent issues for the magazine for April 18, 2016 with the melting ice on the cover
4) Then click on the digital issue and read the article in that magazine entitled: "Massive Meltdown" on page 8-11.
5) After reading, look at page 9 for the box that says "Click for 4 bonus skills sheets" and click on it.
6) Go to the third page of the skills sheets entitled "Heat-Trapping Gases" and answer those five questions on a separate sheet of paper.

If you have problems, e-mail me: julianne.cotta@lausd.net

HW #16 for 4/21

Visit this website about climate change and answer the following questions:

http://climatekids.nasa.gov/menu/big-questions/

Go to the section entitled:  "What Is Global Climate Change?"
1. Explain the difference between climate and weather.
2. Explain what is our "global climate" is and the parts of our global climate.

Go to the section entitled: "What is the Greenhouse Effect?"
3. Compare how the Earth's atmosphere acts like an actual greenhouse.
4. What is the problem that increased carbon dioxide in our atmosphere is creating for the ocean? How is it changing the ocean?
5. What is the "cloud riddle" that has scientists confused?

Go to the section entitled: "How do we know the climate is changing?"
6. How many degrees is the planet warming? How many of the last twelve years have been the hottest on record?
7. How are scientists able to tell what Earth was like many years ago?

HW #15 for 4/19

HW #15 for 4/19:
1. A student performed an experiment in which a yellow solution is poured into a beaker
containing a colorless solution. A bright yellow precipitate formed, and the temperature of the
reaction container increased.
Which of the following statements is true?
A. The reaction is endothermic.
B. The formation of the precipitate is a physical change, not a chemical change.
C. The reaction is exothermic.
D. none of the above

2. The amount of heat gained or lost by a substance depends on all of the following
EXCEPT:
A. the change in temperature of the substance.
B. the change in volume of the substance.
C. the mass of the substance.
D. the specific heat capacity of the substance.

3, Which change of phase is endothermic?
A. CO₂(g) ® CO₂(s)
B. H₂O(l) ® H₂O(s)
C. I₂(s) ® I₂(g)
D. H₂O(g) ®  H₂O(l)

4. You place 100.0 g of a hot metal in 100.0 g of cold water. Which substance (metal or water)
undergoes a larger temperature change? Why is this?

5. What is the difference between “quality” and “quantity” of energy? Are both conserved? Is either
conserved?

HW #14 for 4/18

1.) A process is exothermic if:
A.) Energy flows into the system
B.) Energy flows out of the system
C.) The energy level remains constant
D.) The temperature of the system increases

2.) How many CALORIES of heat must be added to 3.0 x 102 g of water in order to raise its temperature by 40.0 degrees C? (Hint: first find Joules and then convert to calories)

3.) If the same quantity of heat is supplies to 100 g of each of the following substances, which substance will increase the most in temperature? (look at table on pg. 329): Water, iron, gold, ice, or carbon

4.) When 100 g of ice melts to form 100 g of water, the process is exothermic or endothermic? Explain why.

5.) Knowing that 1 calorie = 4.184 Joules, how many calories of energy are reguired to raise the temperature of 10.0 g of water by 1 degree Celsius?

6.) Which change results in a release of energy?
A. The melting of water
B. The boiling of water
C. The evaporation of water
D. The condensation of water

7.) Compare the amount of energy and molecules in 1 mole of water at 0 degrees Celsius and 1 mole of water at 23 degrees Celsius.
A. The amount of energy is the same and the number of molecules is the same in both
B. The amount of energy is the same, but the number of molecules is greater at 23 degrees Celsius
C. The amount of energy is greater at 23 degrees and the number of molecules is greater
D. The amount of energy is greater at 23 degrees and the number of molecules is the same

HW #13 for 4/12

HW #13: 
1) Express 34.8 cal of energy in units of joules
2) Express 47.3 J of energy in units of calories
3) Determine the amount of energy as heat that is required to raise the temperature of 1000 mL of water from 25.0°C to boiling (100°C). Answer in joules and calories. 
4) If 455 J of heat is transferred to 25.0 g of water at 45.0°C, what is the final temperature of the water?

HW #12 for 4/11

1) HW #12: pg. 333 #2,4, pg. 338 #2, pg. 353 #22, 24, pg. 355 #60 a-c
2) Late HW due next Friday
3) Composition books due next Friday (catch up on all labs posted on blog)

HW #11 for 4/7

1) HW #11: pg. 357 #2, 4-6, 8, 11
2) Periodic Assessment tomorrow
3) Comp books due next Friday