Answer:

1. When you stretch the balloon over the opening of the bottle, all of the air is trapped inside. Putting the bottle in hot water causes the air molecules inside to heat up and begin taking up more space (thermal expansion), causing air to enter the balloon and inflate it

2. Air molecules collide into the balloon with the same energy inside and outside the balloon. ... These molecules now collide into the balloon with more energy resulting in increased pressure. The increased pressure causes the balloon to expand

3. As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward

4. The expanding gas blows up the balloon. When you put the bottle into cold water, the air cools down again. Cool air hasn't got as much energy, so it shrinks - and the balloon shrinks with it

5.Why do helium balloon shrink up after the party is over? Nearly all substances contain small pores that allow passage of molecules both in and out. ... The lighter helium gas molecules leave the balloon faster than the heavier nitrogen and oxygen molecules can enter the balloon. Over a period of time, the balloon shrinks

6. Cold air is filled with dense, closely packed molecules. Since the molecules are so closely packed together, it is harder for them to move, and they absorb less energy. The atmospheric pressure pushes their molecules down to the surface of the Earth. Therefore, making the cold air sink and the hot air rise

Explanation:

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