“Stop the Leak”

Observations When adding water to the bottle with the cap off, the water leaked. The water came out at a steady flow. As the water leaked out, the bottle contracted. When you put the cap on the bottle, the leak stopped completely.

Theory With the cap off, the atmosphere around the bottle opening forces down on the water surface in the bottle. The result is water leaks out of the hole from opening of the side of the bottle. With the cap on there is no more force coming in and it stops the leaking. With the cap on there is no pressure on the gas particles in the bottle in therefore less pressure to force the water out.

Conclusion There is air pressure on the outside of the bottle that is pushing into the bottle, therefore it keeps the water from leaking.

The Index Card Show

Experiment Place an index card on the top of the flask Flip the flask/index card upside down. Remove your bottom hand, but leave the index card alone.

How does this work The force of the air on the flask and the note card and the water is more on the outside so that’s why it keeps it up, so if you don’t put the flask full of water the air is also pushing on the note card and air is heavier then water so the air wont have a higher pressure pushing on to the note card to keep it up

The act or process of changing position or place. The note card held the water, and the note card stayed on the flask. Of, relating to, or consisting of molecules The act or process of changing position or place.

“Full of Hot Air?”

What Happens to The Balloon? The balloon is on the top of the Erlenmeyer flask. When the Erlenmeyer flask is on the hot plate the steam from the boiling water inflates the balloon.

Ice Cold After you let the flask cool down in the ice bath you then put the flask back onto the hot plate but with no balloon. Once the water is at a boil you then take the flask off the hot plate and place it on to the table. You then place the balloon over the flask and you see the balloon inflate slowly. Then after it inflates you place the flask back into the ice bath and watch the balloon inflate into the flask.

How it WORKS! The balloon inflates because the boiling water gives off a gas to inflate it. Then when the flask in the cold water with the balloon, it will start to deflate into the flask. There is low pressure in the cold water and there is high pressure out side of the flask.

Molecular Motion Pressure- The gas from the steam inflates the balloon because the molecules have no where to go. Volume- As more air malicious come inside of the balloon the balloon gets bigger and the balloon needs more room. Temperature- When water is at the boiling temperature gas is formed and there is high pressure made. When is the cold water there is low pressure.

Pictures

The Mysterious Water

4) We then put the beakers on the hot plate 5) The heat makes the air trapped in the smaller beaker expand (when air heats up it expands). 1) Start off with a 500mL beaker with 100mL of water. 2) we put blue food dye in the water. 3) then put a 40mL beaker in the bigger beaker.

6) The air is pushing down on the water inside the small beaker. 7) Due to the fact that they need equal out the pressure 8) So air is escaping from the inside beaker 9) Then when you cool it down the air molecules come closer together and slow down. 10) After that water fills up in the smaller beaker. Because there is less pressure inside so it equals out from the outside.

The Can Crush!

experiment We heated a can with 20 mL if water on a hot plate. After steam came out, we placed the hot can in ice water. A “popped” noise happened and then the walls of the can crushed in on themselves.

* the pressure makes the can implode The pressure inside the can goes up when the can is hot. And the pressure in the ice water is low. So when the two meet, a violent reaction occurs, and the change in temperature makes the can implode. * the pressure makes the can implode

Observations: the can heated up, then steam came out of it. then we put it in the cold ice bath and the can totally imploded.

we think this happened cause a lot of pressure builds on the inside of the can. then when you put the can in the cold water, all of the pressure rushes out of the can.