No, they simply pass air over a heating element to warm it. They don't use up any oxygen.
Sodium does not react easily with oxygen at a room temperature so it has to be heated up a little for the reaction to start. Since air is mostly oxygen once the reaction starts it gets pretty violent and the piece of sodium explode.
What we see, at least in the instance of the space shuttle launch, is hydrogen and oxygen being vented. About the last thing we do before sending the shuttle up is fuel it. Liquid hydrogen and liquid oxygen are pumped into the cryogenic tank (the giant cylindrical container to which the shuttle itself is connected, and to which the solid booster rockets are attached. As the liquid hydrogen and oxygen are pumped in, they supercool the tanks in which they enter. As the tanks cool, some of the hydrogen and some of the oxygen are "boiled off" in that cooling process. The H2 and O2 have changed phase to a gas, but are still extremely cold, and as the liquid H2 and O2 full the tanks, that very cold gas is vented off and, because it is so cold, it appears as the "clouds" or "steam-looking" stuff that is visible during (and up to) launch.
Both oxygen and hydrogen would be dangerous to fill up a party balloon with. Both of these gasses are extremely flammable, although of the two, hydrogen is by far the worst.
Making cookies would constitute a chemical change.
I don't know what you mean by "blow up tanks," but I think the tanks blew stuff up =P
Explode
Anything is able to explode if you blow it up.
Explode.
to detonate
to explode or to blow up
Detonate
A material that will explode, blow up, such as dynamite.
detonate
When you get too close to them, they start a fuse for 1.5s and then blow up.
yes
you will get fat and explode and then reform into a pickle you will get fat and explode and then reform into a pickle