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Thursday, March 19, 2015

Ch. 5 - Thermal Energy, Heat, and Temperature Online Exploration

1.      Play the Fahrenheit and Celsius temperature scales game; make a data table and compile a list of the ‘F/’C temperatures with their corresponding icons (pictures) in your notebooks.

-Heat Transfer interactive-
Introduction: Heat always travels from a ______ object to a ______ object.
 1. Conduction
  a. What substances make good conductors?  
  b. What substances make bad conductors (good insulators)?
  c. What is conduction?
  d. The better the conductor the more _______ heat will transfer.
  e. In conduction, do the substances need to be touching each other?  Explain. 
2. Convection
 a. Draw a picture of a convection current.  Label the red and blue arrows. 
 b. What is convection?
 c. What are some other examples of convection?
 d. Convection is the primary method that heat transfers in _______ and _____.
 e. Which is denser, cold air or warm air?  Explain.
3. Radiation
  a. What effect does the sun's radiation have on the temperature of the house?
  b. What are some other examples of radiation heat transfer?
  c. Radiation can travel through empty space.  True or False?
  d. What is earth’s primary source of radiation? 

1.      Can you “beat the heat”?  How far can you go?!
2.        Which level did you make it to?  Write the information down in your notebook.

1. Read the information on Thermodynamics.
 a. Heat and Thermal Energy: When heat is increased in a system, what else is increased?
 b. Heat of Atoms: Heat is transferred on a molecular level.  Explain.
 c. Heat Movement: What causes heat to move from one system to another?
2. http://www.physics4kids.com/extras/quiz_heat_intro/index.html
        Now, take the online quiz on Thermodynamics; write the answers in your notebook.


-       1. Compare/Contrast the molecules of solids at different temperatures and the molecules of liquids at different temperatures. 
-       2. The Kinetic theory of matter states: All matter is made up of ______ and ________ that are constantly ______.

1.    In conduction, thermal energy moves from ____ to ____.
2.    Look at Table 2.2 “Heat Conductivity of Various Substances”
  a.    List in order of high conductivity (conductor) to low conductivity (insulator): wood, water, silver, air, and iron.  
  b. Rank the three states of matter in their ability to conduct heat. 
3.    Give a brief description of atmospheric convection.
4.    What are four examples of radiation?  (The website gives you two; think of two new examples.)
5.    Draw a picture of conduction, convection, and radiation.  Label them correctly.

1.      Read Convection, Conduction, and Radiation
2.      Play the Heat Review game at the bottom of the page




        1. What happens to the volume of objects when they absorb thermal energy?
        2. What happens to the volume of objects when they release thermal energy?



I. In the transfer of thermal energy, or movement of heat, how does radiation differ from conduction and convection?

J. Write down observations, thoughts, inferences on each method of heat transfer: conduction, convection, radiation.

- Play the animation for each method of heat transfer; explain what is happening in each animation.  What are examples of each?  Think of an additional two examples of your own for each.

        


Monday, March 16, 2015

Lab #6 – Heating Up and Cooling Down


Lab #6 – Heating Up and Cooling Down

Do you remember how long it took for a cup of hot chocolate to cool before you could take a sip? The hotter the chocolate, the longer it seemed to take to cool.

Problem
How does the temperature of a liquid affect how quickly it warms or cools?


Hypothesis



      
  Materials
3 beakers
3 thermometers
Stopwatch
Ice
Hot plate
100 mL Graduated Cylinder

Procedure
  1. Use the data table to record the temperature of water in three beakers every minute from 0 to 10 min.
  2. Fill one beaker with 100 mL of water. Place the beaker on a hot plate and bring the water to a boil. Carefully remove the hot beaker from the hot plate.
  3. Record the water temperature in your data table at minute 0, and then every minute for 10 min.
  4. Repeat step 3 starting with water at room temperature and ice water.
  Results
Ice Water
Time (min.)
Temperature ('F)
Temperature ('C)
0
 32’F
0’C
1


2


3


4


5


6


7


8


9


10


   
Room Temperature water
Time (min.)
Temperature ('F)
Temperature ('C)
0


1


2


3


4


5


6


7


8


9


10


  
Boiling Water
Time (min.)
Temperature ('F)
Temperature ('C)
0
212’F
100’C
1


2


3


4


5


6


7


8


9


10


  
Analysis

1.                   Graph your data for all three beakers; use only your temperatures in Fahrenheit!  Use a different color for each beaker.
2.                   Construct a fourth line graph using the data from all three data tables; there should be three lines: ice water, room temperature, and boiling water.
3.                   Infer from your results how the difference between room temperature and the initial temperature of the water affected the rate at which it heated up or cooled down. (i.e. Where was the greatest change in temperature, in the beginning (when is stopped boiling/finished melting) or as it neared room temperature?)
4.                   What happened to the temperature of the boiling water over time?
5.                   What happened to the temperature of the ice water over time? 
6.                   What happened to the temperature of the room temperature water over time?

7.                   Do you think there will be a temperature at which they would eventually meet?  If so, where do you think it will be?  If not, why not?

Conclusion

 What was your problem?
 Restate your hypothesis.  Was it right? wrong?  why or why not?
 What did you learn in this lab?
 What did you like about this lab?
 What were some challenges you had to deal with?
 What could you do next with this problem?  What other tests could you perform?
 Write down any other additional thoughts, observations, inferences, etc.


















Wednesday, March 4, 2015

Daily Weather Journal

Daily Weather Journal - What is the weather today?
Make a journal of the weather each day.  Illustrate your experience with the weather today.  Use weather symbols, pictures, images; be creative!  Each journal entry should take up a full page; 1/2 page for Written information and 1/2 page for Illustration

A. Science Information
1. Find the high and low temperatures of the day (‘F/’C)
2. Humidity (%)
3. Air pressure: Barometer (in/cm) 
4. Precipitation (in/mm)
5. Cloud cover

B. Personal Paragraph


- How does this weather affect you?  How does it affect your 


clothing, outdoor activities, etc.  

C. Illustration - 
Be creative, make an illustration of what the weather means to you today and how it affects your daily life.  Illustrate your experience with the weather today.  Use weather symbols, pictures, images, be creative!  This should be ½ page.



Helpful websites: http://www.weather.com/

Friday, February 13, 2015

Chapter 4 Online Exploration of Matter

A.
-Watch the video-
1.    Most matter can be found in three states:_____, ______, and ___.
2.  The law of conservation of energy states that matter can never be _______ or _________.
3.  All matter is comprised of _______.  
4.  The universe is made up of _______ and ________.
5.  Give an example of a physical change; what makes it a physical change?
6.  If you were the video's scientific creator, what would you add to show "states of matter"?  How would you explain it?  What models would you use? 

  B. 
   -Play the interactive game-
1.       Describe the arrangement and movement of the particles as you change from a solid to a liquid to a gas.
2.  Describe the arrangement and movement of the particles as you change from a gas to a liquid to a solid.
3.  Pick 2 phase transitions and make a sketch of them.  Describe whether energy is lost or gained in this transition.  


  C. 
       -Play the interactive game-
1.       What happens to the liquid when you heat it?
2.       Does the gas stay in one beaker?  Where does it go?  Why does this happen?  (Think: Energy)
3.       Cool down the gas.  What happens (Use your science vocabulary)?  Why does the liquid appear in both beakers?
4.       Heat the liquid again.  What happens to the gases when you remove the lids?  Why does this happen?
5.      Describe the motion of the atoms in each beaker.
6.  Sort the 9 items into their correct Phase of Matter; make a list in your notebook.
7.       Take the Quiz; write the answers into your notebook.

  D. 

      Watch the How Stuff Works Videos States of Matter Changes in State

1.     What happens to the molecules of liquid water when it boils?
     2.  Explain the difference between boiling and evaporation.

    3. What is the boiling point of water in 'F/'C?

    4. What is the melting point of rock?  What is the melting point of water?
    5.  What happens to water molecules when they freeze into a solid?
    6.  At the 2:00 mark, estimate the volume of the liquid in the beaker, don’t forget units!
  Play around with the animation.  Write a summary of the animation and line graph using the following terms: temperature, melting point, boiling point, solid, liquid, gas, melting, boiling, freezing, condensing.  Also, describe the movement and arrangement of molecules.

   F. http://www.youtube.com/watch?v=Gm6OvHUzGjM

   How Stuff Works Videos States of Matter Evaporation

     1.  A water molecule is made up of what atoms?
     2.  Draw a picture of "evaporation".
     3.  Draw a picture of a molecule of water in the vapor phase.
     4.  Through a process called ________, water vapor can turn back into a liquid.
     5.  Where do you experience evaporation in real life?  Draw a picture.

G. 
1.       Compare/Contrast the arrangement and movement of the molecules of a solid, liquid, and gas.  Make sure to use the term, “energy”.

     1. What's happening to the outside of the glass?  Describe what you see.
2.     Where are the water droplets coming from?
3.     Has this ever happened to you?  Where?  Describe the situation. 



    1. As the molecules of a solid get hotter, they vibrate ______ and ______.
    2. How do the molecules of a solid behave?
    3. When a water molecule escapes into the air, why can't you see it?
    4. If you left a glass of water in the sun, why would it evaporate faster?
    5. What happens when water vapor molecules come into contact with a cold surface?
    6. The cooler the molecules get, the _______ they move.
    7. Where does the word "condensation" come from?

1.       Play the various interactive games.