Soap Molecules and Their Properties

NASA astronaut Don Pettit used candy corn in space to demonstrate how surfactant molecules work. The candy corn acts like soap molecules, with hydrophilic and hydrophobic ends, to clean grease. The demonstration shows how soap molecules surround grease, making it water-soluble at a critical concentration. Pettit used the entire crew's candy corn supply for this experiment, illustrating the concept of surface tension in zero gravity.

What special item did Don Pettit choose to bring to space?

• M&Ms

• Beef jerky

• Candy corn

• Chocolate bars

What is the zero-gravity candy corn demonstration an analogy for?

• How a surfactant molecule works

• How to make candy corn

• How to grow plants in space

• How astronauts eat in space

In the demonstration, what does the candy corn represent?

• A soap molecule

• A water molecule

• A grease molecule

• An oil molecule

What is the term for the water-loving end of a soap molecule?

• Hydrophobic

• Hydrophilic

• Lipophilic

• Amphiphilic

What happens to the grease blob when it is fully covered by soap molecules?

• It hardens

• It evaporates

• It changes color

• It becomes water-soluble

What is the critical micelle concentration in the context of soap?

• The point at which soap molecules dissolve in water

• The point at which soap molecules fully cover a grease blob

• The point at which soap molecules evaporate

• The point at which soap molecules change color

What happens to the blob after reaching the critical candy corn concentration?

• It changes color

• It becomes rigid

• It becomes smushy

• It evaporates

What holds the blob together in space after it becomes rigid?

• Surface tension

• Magnetism

• Air pressure

• Gravity

What did Don Pettit apologize for after the candy corn experiment?

• Breaking the equipment

• Using all the candy corn

• Spilling water

• Wasting time

What is the main purpose of the candy corn demonstration?

• To entertain the crew

• To test the durability of candy corn

• To demonstrate how soap cleans grease

• To show how candy corn tastes in space