Question

answer the following questions about what you just learned in the video!
question 1
what caused the balloon on top of the bottle to expand when heated?
the air particles inside moved faster and spread out
the bottle stretched and pushed the balloon upward
the heat turned the bottle into a gas and filled the balloon
the particles inside stopped moving and froze the balloon
question 2
why did the rubbing alcohol on the instructors hand feel cold?

Explanation:

When air is heated, the particles gain kinetic energy. This causes them to move faster and spread out. In the case of the balloon on the bottle, as the air inside the bottle (connected to the balloon) is heated, the increased motion and spreading of the air particles lead to the expansion of the balloon. The other options are incorrect: bottles (assuming a typical rigid bottle) don't stretch in this context; heat doesn't turn a bottle into a gas; and if particles stopped moving (which would be at absolute zero, not due to normal heating), the balloon wouldn't expand.

Answer:

The air particles inside moved faster and spread out.