1. PIC NEEDED

2. being able to transfer energy (thermal, electricity, sound)
Jan 23 / Act D 59
Ice Melting Contest
LEARNING TARGET: I can identify methods to maximize thermal energy transfer.
CH Q
How can you increase the energy transferred to an ice cube?
VOCAB:
Conduction / conductor
being able to transfer energy
(thermal, electricity, sound)

3. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. D 37 and summarize
DATA: Notes in Journal
Pre-Lab Thought:
What would be the best method for the control?
set up a bag with same sized / shaped ice cube and do NOT do anything to it

4. You may not put the ice or the bag in your mouth.
ICE-MELTING RULES
You may not put the ice or the bag in your mouth.
Keep ice cube in plastic bag until end of contest.
Handle bags carefully. (broken bag disqualifies you)
Keep ALL water in bag. (spills cannot be measured)
Watch carefully for teacher’s START/STOP signals.
As soon as the contest time is up, remove the remaining ice from the plastic bag - place it in the cup provided, and set it aside.

5. POST DISCUSSION
Did you alter the way you melted your ice cube during the 3 minutes? If so how?
How much water (mL) did you melt with you methods?

6. POST DISCUSSION
Discuss and list all the variables that affected how fast the ice melted.
If you did this next time, what would you change?
1. conducted heat (from body, table, sink, air)
2. surface area (more area = more melting)
1. stronger bags
2. all ice cubes same size
3. all liquids collected same time

7. True or False:
The ice made your hands cold, because the ‘cold’ was transferred to you hands.
False:
Your hands were cold because of the loss of thermal energy from your hands to the ice (you gave your heat away)
*Hot things Have the energy – so it moves from them to the cold things

8. Things are cold when there is an absence of thermal energy
Similar concept
Light is a form of energy… Darkness is simply the absence of light.
Things are cold when there is an absence of thermal energy
No such thing as ‘cold’

9. Reminder: What is temperature??
It is the movement of particles.
The faster the particle movement the more thermal energy… the warmer it is.
The slower the particle movement the less thermal energy, the ‘colder’ it is.

10. ANALYSIS
- Discuss and answer Q 2 & 3 on pg.D 38
ANS CH Q
How can you increase the energy transferred to an ice cube? A:
1. increase surface area
2. increase temperature conducted
3. add other energy sources: infrared (heat) light
HOMEWORK
Bring items that could be used as insulators Bring Next class !!!!! - NOT a commercial insulator - thermos / cooler / etc