1. Why does Ice melt slower in Coca-Cola than Diet-Soda?
The Ice-Cube Dilemma
Why does Ice melt slower in Coca-Cola than Diet-Soda?

2. Start: Observations 2x250 mL beaker 100 mL measuring cylinder
2 ice cubes (small size)
100 mL Coke
100 mL diet Coke
Time how long it takes for the ice to melt in each beaker

3. Hmm what is in Coke® Anyway?
Tiny amount of salt
10 tsp of sugar
No sugar

4. Is the difference because of sugar in the water?
2x250 mL beaker
100 mL measuring cylinder
2 ice cubes (small size)
100 mL DI water in one beaker
100 mL DI water with 25 mL sugar in the other beaker
Time how long it takes for the ice to melt in each beaker

5. What is melting?
Hot, fast moving, water molecules collide with cold ice
The hot water molecule gives energy to the ice and becomes cooler and now is moving much slower
The energy given to the ice gives the molecules at the surface of the ice enough energy to break free
The faster you can get the hot water in, and the cold water away the fast the ice will melt

6. Glucose in water
Glucose is 10x heavier than water and moves more slowly
Water sticks to the glucose
The water-glucose units move very slowly and the water molecules that are not stuck to the glucose must move around the water-glucose units
We say glucose in water is more viscous than pure water
Glucose with water in it is heavier per mL than water – it is more dense

7. How will the heavier glucose affect melting?

8. How can we prove this hypothesis?
What if we could help the glucose to move faster?
What if we stirred the water/ice solution and stirred the glucose/water/ice solutions?