Students make their own chewing gum and observe a polymerization reaction.
Students will explore the special properties of their chewing gum polymer, and the effect of heat on the polymer.
Name some practical uses for polymers.
Investigate the properties of common polymers.
Describe in general terms what occurs during a polymerization reaction.
Bubble gum making kit:
1/3 cup of gum base
¼ tsp of citric acid
1 tsp glycerine
2 tbsp of corn syrup
1/2 cup of powdered sugar
5 to 7 drops of flavouring (traditional bubble gum, chocolate or vanilla)
Plastic bags * Bubble Gum kits are available from some candy shops and large chain stores such as WalMart, or can be ordered from Steve Spangler Science . If using a kit, follow the instructions provided.
What To Do:
Mix 1/3 cup of gum base with 1/4 tsp of citric acid, 1 tsp of glycerine and 2 tbsp corn syrup.
Microwave the gum base mixture in a microwavable bowl for 1 minute.
Pour out 1/2 cup of powdered sugar onto a cutting board and make a hole in the center of the pile. Leave a little powdered sugar in a bowl to the side to coat your fingers when you begin kneading the gum mixture.
Remove the gum base from the microwave and stir. The gum base should be thoroughly melted and very sticky. If it’s not, microwave it for another 30 seconds and stir again. Repeat the process until the mixture is gooey.
Add 5 to 7 drops of flavouring to the gum base and mix well.
Knead the gum base mixture and powdered sugar for 20 minutes. The dough should feel smooth and stiff in your hands. If it gets sticky, add more powdered sugar. The longer you knead the dough, the less likely the gum is to fall apart as it’s chewed.
Roll the homemade bubble gum into a rope, and cut it into bite sized pieces using scissors.
Wrap each piece in wax paper, or store them all in a re-sealable plastic bag.
Weigh gum before and after chewing. Do you expect it to increase or decrease in mass? (The mass should decrease substantially because over 60% of bubble gum is sugar which should dissolve during chewing.)
Science World Resources | Full lesson & other activities | Goo Science World at TELUS World of Science | School Programs | Chemistry University of Southern Mississippi | Polymer Science Learning Center | Make a Virtual Polymer
What special properties does this polymer have?
What effect did heat play in the formation of this polymer?
What can we observe from making this polymer?
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