mini project # 3 PLAYDOUGH

photo credit; Lexi Chierici

in class with our group we made play dough. first we got out pot and filled it with the ingredients below. we mixed it well till it look completely mixed. then we had the choice to pick a color for our play dough. we got to pick between reds blues pinks and yellows. our group choose pink. we set our hot plate and began to cook the play dough. it took a long time for the play dough to get hard. finally we were done cooking and we god to play with the dough. at first it was hot so we couldn't touch it with our hands. the play dough was soft in some parts and more rough in others. but if you moves the hard parts with your hands it would soften out. overall it was really fun and simple to make and even more fun to play with!

Ingredients/Materials:

1. hot plate
2. pot
3. flour
4. water
5. salt
6. oil
7. food coloring
8. mixing spoon

Science:

-chemical reations

- physical reations

mini project #2 Ice cream

photocredit = Jensen Li

Inclass today we made ice cream! everyone was really excited to get started the procedure was simple but took time and the right measurements to make it correctly. once we got our partners and plastic bag we began to fill them with all the ingredients listed below. after, we began to flip the back back and fourth holding it from the top. after maybe 3-5 minutes my partner and i were ready to test the ice cream. we were nervous at first because other kids had complained that the salt had seeped into the ice cream and gave it a bitter taste. when we finally tried it it tasted pretty good! some parts were thicker than others but overall it was delicious!

Materials/Ingredients:

1. plastic bags
2. milk
3. sugar
4. vanilla extract or chocolate syrup
5. ice
6. salt
7. spoons
8. measuring spoons/cups

Science

Ice has to absorb energy in order to melt, changing the phase of water from a solid to a liquid. When you use ice to cool the ingredients for ice cream, the energy is absorbed from the ingredients and from the outside environment When you add salt to the ice, it lowers the freezing point of the ice, so even more energy has to be absorbed from the environment in order for the ice to melt. This makes the ice colder than it was before, which is how your ice cream freezes.

Theories

-freezing point depression

Chem standard 10A

Chem standard 10A : large molecules (polymers), such as proteins, nucleic acids, and starch, are formed by repetitive combinations of simple subunits.

A polymer is a large molecule composed of repeating structural units typically connected by covalent chemical bonds.

bio polymers such as DNA and proteins that are essential for life on the other. A simple example is polyethylene, whose repeating unit is based on ethylene monomer.

SUBUNITS

• proteins: amino acids


• Nucleic Acids: nucleotides


• Starch: carbohydrates
  
  
  

mills canyon field trip

View Mills Canyon in a larger map\



Last thursday my chemistry class and i took a field trip to mills creek canyon. first we took about a mile walk to get to the canyon. the walk was enjoyable but the uphill section was a bit tiring. once we arrived at the canyon we walk for about an hour through the dirt, mud, leaves and grass. later we ate lunch on the whispering staircase. at about 1:30 we walked the same path back to mills.

overall i enjoyed the field trip. it was fun learning somewhere other than the classroom. the only thing i would change is that i had a better understanding of what was our destination and i wish i didnt get a sunburn!!!

here is a picture of me and my friends at the canyon :)

The unpopable water balloon!

photo credit: Alexis Chierici

When me and my partner, Kaylyn Dawkins, first entered the lab to create our mini project we had no clue what to make. All we knew is that we had a balloon to work with. We decided to make an unbreakable water balloon. we filled up the balloon and then found thing we could surround the balloon with to keep the plastic balloon itself from being harmed. We surround the water balloon with the following items

1. pink post it's (for color and/or decoration).
2. plastic tape for protection.
3. bubble rap for support.

when we finished making our balloon we went outside to test it's durability. my partner threw it up and unfortunately it popped. we failed but with more protection or balloon would have survived.

SCIENCE:
molecular structure of water and air.


a real unbreakable water balloon!

IProposeWe Make a mentos bottle rocket

Materials

- 2 liters of diet coke

- 4 mint flavored mentos



Procedure

1. gather the materials you will need

2. cut a strip of paper about 4 inches

3. take out 5-7 mentos out of the roll

4. Lay the Mentos face-down onto the strip of tape, just as they are lined up in a roll of Mentos.

5. Take another strip of tape the same size as the previous one, and put this one on the top. Leave the sides of the Mentos exposed

6. Take a strip of tape about three inches and roll its sticky side out around your finger to make a roll that is sticky on the outside.

7. Take that and stick it to the top of the Mentos roll

8. Stick that to the bottom of the diet coke cap

9. Make sure that it is secure and then twist the cap back on

10. 10Take the coke and face the cap opposite of where the coke should go. Jump in the air and slam the coke on the ground evenly on its side.

11. STEP BACK AND ENJOY!!!!!





Safty Precautions

- make sure you are outside when you preform the expiriment in a large open area.

- make sure there aren't a lot of people around.







Scientific Principle

*When the mentos are dropped in the bottle of Diet Coke, a large amount of carbon dioxide gas is released in an instant, resulting in an eruption of soda. Diet Coke is supersaturated with carbon dioxide gas. Scratches on the surface of a Mentos mint can serve as nucleation sites, places where the carbon dioxide gas can form bubbles. Since there are so many of these sites on a Mentos, the gas comes out of solution extremely rapidly. The effect is magnified by the fact that a Mentos is denser than Coke. As it sinks, it comes into contact with liquid from the top to the bottom of the bottle. The sudden increase in pressure that results from the rapid release of gas forces the soda out of the bottle.



SEE FOR YOURSELF!



LINK #1



LEARRRRRRRRRRRRRN MOREEEEEEEEEE :)

Endothermic reactions

Endothermic reactions draw heat in from their surroundings

*gain heat

*have a positive delta H

*have energy as a reactant

*ex: photosynthsis

reactants + energy ---> products