ICE CREAM DESIGN CHALLENGE Knowledge Probe What did you learn in the Endothermic v. Exothermic
Investigation? Add cup milk, tsp vanilla and 1 tbls sugar to a quart-sized bag. Zip shut and mix. Add 4 cups of ice and 4 tbls of salt to a gallon-sized bag. Take temperature of ice cream mixture and place ice
cream mixture into gallon-sized bag and zip. Start timer. After five minutes check the temperature of the ice cream mixture. BASIC INSTRUCTIONS
Video: https://www.youtube.com/watch?v=x-_omO NdCIo WHY SALT AND ICE? When salt is added to ice, a salt water solution is
created. Salt water has different properties than water. One of which is that the freezing point is lower. As a result some of the ice melts. Melting is an endothermic process. Endothermic processes take in heat from their surroundings. Where will the ice take heat from to allow it to go
through the endothermic process of melting??? WHAT ENDOTHERMIC PROCESS WILL FREEZE YOUR ICE CREAM? The heat (energy) can come from many places, causing a
decrease in temperature of those places (hand, air table, etc.). What are the possible surrounding that the ice can take heat from in order for this endothermic process to occur?
If the heat (energy) comes from the milk, then the milk will decrease in temperature. This is our goal! What is the goal? Where do we want the heat to transfer from?
Testing 1. Add cup of water to a quart-sized bag. Zip shut. 2. Put 4 cups of ice in the gallon sized bag. 3. Take temperature of water. 4. When instructed, add salt to a gallon-sized bag.
5. You now have one minute to place water bag into device. 6. Start timer for five minutes. After five minutes check the temperature of the water. DIRECTIONS Put ice in the sink.
Throw away plastic bags. Clear off table. I will come spray and wipe tables when they are cleared off. CLEAN UP Learn about your classmates designs:
1. Share your results. 2. Discuss what worked well and what didnt. 3. Record their temperature change and interesting things about their design. Class Data
Final Test - ICE CREAM! 1. Add cup milk, tsp vanilla and 1 tbls sugar to a quart-sized bag. Zip shut and mix. 2. Add 4 cups of ice to the gallon sized bag. 3. Take temperature of ice cream mixture. 4. When instructed, add the salt to your ice. You now have one
minute to place ice cream mixture into device. 5. Start timer for five minutes. After five minutes check the temperature of the ice cream mixture. You may continue to process your ice cream after this point. However, you must record the temperature after five minutes as your final temperature.
DIRECTIONS Put ice in the sink. Throw away plastic bags. If any parts can be saved, remove any trash from them. Throw away all trash.
Clear off table. I will come spray and wipe tables when they are cleared off. CLEAN UP
The views expressed in the publication are those of the authors and not necessarily those of the Department of Health Contact: Dr Kai Uus NHSP Evaluation Human Communication & Deafness Group The University of Manchester Oxford Road Manchester M13 9PL...
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