Colourful gobstoppers

Colourful Gobstoppers Question: What will happen if I sit Gobstopper lollies in water?

Hypothesis: What is your prediction?

These are some ideas from Room 10 students: The lollies will shrink; they will fizz; the water will evaporate; the gobstoppers will change colour; the colour might go into the water.

Method: Equipment 4 gobstopper lollies of different colours A waterproof container - white or clear Water at room temperature A white paper towel Steps 1. Place the container onto the paper towel.

2. Drop the gobstoppers into the container, evenly spaced.

3. Pour water into the container just covering the gobstoppers. If the gobstoppers have moved, push them back to where they were.

4. Watch closely over 6 minutes to observe any changes.

Conclusion : What happened? Was your prediction correct? Why do you think this happened?

Fair test: What would you change if you did the experiment a second time?

Remember for it to be a fair test to compare to the first experiment you can change only one thing.

Some options are: the shape of the container; the size of the container; the amount of liquid, the temperature of the liquid; the type of liquid; the type of lollies; the size of the lollies.