cutting and bending glass and putting toothpick in balloon

This week we did two experitmentsl, bending glass and putting toothpick in ballon.

We wore goggles for our safety and cut the glass before we burn the glass.

We used nail file to cut the glass. After we made damage in the glass, we broke the glass whcih faced downward. Then we put glass above the fire and made glass melt and bend slowly. We had to be careful because it might burn your fingers. It was interesting experiment.

We blew the balloon and tied the top. And then we picked the sharp toothpick and put vaseline on the balloon and toothpick. We were scared to put the toothpick in the top of the balloon so we asked someone else to do it for us but he also failed. I regreted after him by not trying. I could success instead of him. Anyways, I knew tht balloon could hold sharp thing on the top of the balloon.

IProposeWe

Link: Make Ice Cream in a Baggie

Materials:

• 1/2 cup of milk



• 1/2 cup of whipping cream



• 1/4 cup of sugar



• 1/4 teaspoon of vanilla or vanilla flavoring



• 1/2 to 3/4 cup of sodium chloride as table salt or rock salt



• 2 cups of ice



• 1-quart ziploc bag



• 1-gallon ziploc bag

Procedures:

1. Add 1/4 cup of sugar, 1/2 cup of milk, 1/2 cup of whipping cream and 1/4 teaspoon vanilla to the quart-ziploc bag. Seal the bag securely.
   
2. Put 2 cups of ice into the gallon-ziploc bag.
   
3. Use a thermometer to measure and record the temperature of the ice in the gallon bag.


4. Add 1/2 to 3/4 cup of salt to the bag of ice


5. Place the sealed quart-bag inside the gallon bag of ice and salt. Seal the gallon bag securely.


6. Gently rock the gallon bag from side to side.


7. Continue to rock the bag for 10-15 minutes or until the contents of the quart bag have solidified into ice cream


8. Open the gallon bag and use the thermometer to measure and record the temperature of the ice/salt mixture.


9. Remove the quart bag and enjoy your ice cream.

Safety Precautions:

Wear gloves when you rock the gallon bag. It might damage your hand

Scientific Principles:

Ice absorbs the energy in order to melt. the energy is absorbed from the ingredients and from the outside environment. When you put salt into the ice, it lowers the freezing point of the ice so more energy can be absorbed. Ice gets colder and this is how your ice cream freezes.

proposal for activity

I want to do the experiment like you did with aluminum balls.
It made sparks when you hit the balls together. It was short but strong.
I heard Mr. Paul's class made a icecream. I want to do that too.
I want to do something big! hahahaha
ex) black snakes or glow worms
colored fire spray bottle
fake snow
green fire
ice cream in a baggie
colored smoke bomb
glow in a dark slime
making glass

Gases

STP tells us that 1 atmosphere is 273K. When we do the problems, we have to change the variables of temperture to Kelvin.

For equation PV=nRT, P is pressure(atm, kPa), V is volume(L), n is number of moles(mol), T is temperature(K) and R is a gas law constant. R is always constant and it has value of .0821(L atm)/(K mol).

The important thing that we hace to remember is that volume of 1mol He at stp is 22.4L.

I also learned that higher attitudes have less air pressure. And at a given T, lightest molecules move fastest and heaviest molecules move slowest.

Charles' Law abd Gay-Lussac's Law tell us that they are both directly proportional.

Equations for both Laws are V=kT and P-kT.

The combined gas law is P1V1/T1=P2V2/T2. They also have to use temperatures as in Kelvin, too. To change the Celcius to K, you just have to add 273 to the Celcius temperature and that will make you to have Kelvin.