Lab #3 – Heating Up and Cooling Down

 Lab #3 – Heating Up and Cooling Down

                      Copy ↑ into your Lab/Science Notebooks

Do you remember how long it took for a cup of hot chocolate to cool before you could take a sip?  Why do hot drinks come in styrofoam or special paper cups?  Why do teachers drink hot drinks out of porcelain mugs instead of metal, or plastic cups?  Do you have a thermos?  If so, what's so special about it?   ←↑just read that↗           ↗

Problem       copy this as always

What will happen to the beaker of ice water, room temperature water and boiling water over time?

Hypothesis  copy this as always, make your own hypotheses; use the prompts below as guidance      ↙↘

I predict that if I leave a beaker of ice water out then __________________ will happen because_____________. I predict that if I leave a beaker of room temperature water out then ______________ will happen because  __________________. I predict that if I leave a beaker of boiling water out then __________________ will happen because_____________.

      

  Materials   copy this as always

3 beakers, 250 mL

3 thermometers 

Online Stopwatch 

Ice

Heat Source

Procedure  READ this as always. 

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 250 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 copy these 3 data tables as always, use a ruler!

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.   Use your data tables to construct a line graph from all three data tables.  There should be three lines: ice water (colored blue), room temperature, and boiling water (colored red).

                      This is an example of line graph a. ↓↓↓↓

Please answer ALL of these Analysis questions in complete sentences.
2.    What happened to the temperature of the boiling water over time?  Explain your answer.

3.    What happened to the temperature of the ice water over time?  Explain your answer.

4.    What happened to the temperature of the room temperature water over time?  Explain your answer.

5.    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?

6. Think Deeper: Why is the title of this lab called "Heating Up and Cooling Down" ?
7. Go Beyond: Illustrate the three beakers, label them, draw "heat arrows" showing the flow of thermal energy from the higher temperature substance to the lower temperature substance.  
8. All three beakers started at different temperatures, and at the end they are in t______ eq_________ at the same temperature -- "room temperature." Energy has moved from the ______ temperature objects to the objects at _____ temperature, until there no longer is a difference.  (Fill in the blanks; copy the sentence down.)

Conclusion

What was your problem?  Restate your hypothesis.  Was it right? wrong?  why or why not? Did you change your hypothesis in the middle of your investigation?  If so, why? How is this investigation connected to 'real life'?    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.

And yes, follow the prompts to complete your Conclusion↖↗