Mini-Blog post #3

For my third mini project, i made ice cream. When making ice cream it is quite simple. The salt reacts with the ice to create an endothermic reaction. But there are a few simple items.

Needed items:
1. 1 cup of milk
2. a plastic sandwhich bag (preferably ziplock types)
3.1/3 cup of salt
4. 3 tsp of vanilla
5. 1/2 cup of sugar
6. ice
7. freezer ziplock
8. any condiments you wish for your ice cream

to do:
First you need a ziplock baggie. Then take the 1 cup milk and put it in the bag. After, put the 3 tsp of vanilla in the milk. Add the sugar and stir it around in the baggie. Make sure to securely close the baggie. Once that is finished, place the small baggie in a bigger freezer ziploc. put a couple scoops of ice and add the salt. Stir around in the big baggie, until the milk mixture frezzes and you have ICE CREAM.

scientific explanation:
There is no reactions in the milk mixture, but the main part of the reaction is the salt and the ice create an endothermic reation. Then, the endothermic reaction gives off large amounts of cold temperatures. This freezes the milk mixture and creates the ice cream.

Mini-Blog Post #2

For my mini projece I watched oil rise to the top of a cup of water and simutaneously watching food coloring or dye drop to the bottom. The dye created a sea of colors while dropping to the bottom.



What you'll need:

1. A cup of water

2. about 2 tbls of oil

3. food coloring/dye (try to use a variety of colors)

4. a seperate cup (no ingredients in the cup)



To do:

First you will need to get a cup of water. Make sure the cup is not completey full of water, you want to leave about half of the cup empty. After getting that cup of water, pour the 2tbls of oil in a different seperate cup. Once the oil is in a different cup, take your choice of dye a put a few drops of it in the seperate oil cup. Make sure to use a couple of colors to see the full effect of the experiment. After the dye and the oil are together, carefully pour the oil mixture in the water cup. What happens?



Scientific explanitions:

When you finally pour the mixture in the water, usually the oil will dip to the bottom then rise to the top with the dye. After the oil mixture rises to the top, ususally, the dye in the oil becomes heavier than the oil and sinks past the oil. It leaves its circular form and drops in to the water leaving streaks in the water. This creates the color streaks , when you have one or more colors it tends to work better. This happens because the dye becomes denser than the oil and is a little bit denser than the water ad sinks to the bottom creating the water streaks and pool of color at the bottom of the cup.

chem standards

ChemStd 12c: Identifying possible reasons for inconsistent results, such as sources of error or uncontrollable conditions.

When we do experiments, we sometimes have good and bad results. This may depend on our skills and experience or uncontrollable elements and errors made during the process.

When performing an experiment, a person may come upon three types of errors:

1. human errors
2. Systematic errors
3. random errors

Human errors are caused due to the experimenter making a mistake while reading the instrustions, reading the instuments wrong, calculating incorrectly, or making an error by spilling or pouring too much of a substance.

Systematic errors are caused by the instruments of the experiment, which may change the data, graphs, and possible outcomes of the entire experiment itself. For example, if we used water in an experiment and had to leave it outside, depending on the day, the water's density might changes and the results can come out differently changing the whole experiment.

random errors occur because they are uncontrollable and they are not consistently accurate. A good example of a random error is timing an experiment with a stop watch or regular watch. since we cannot stop the watch exactly on the time needed. It may vary some of the results.

Uncontrollable conditions include weather and atmospheric temperatures.

Mills Creek Canyon Field trip

A couple weeks ago we went to go visit the wonderful out doors of mills creek canyon. while out there we had a nature hike and an interesting afternoon. There were many positive things about the trip as well as negatives. For starters I thought it was a good way to spend a good class in the oudoors. The nature trail was a lot of fun and good walking excercise. I thought it was a fun because I was with my friends and we went around searching for new items and exploring the trails. Though there were many positives there were also a few negatives. I thought there was an eating area, but I guess we were wrongly informed, so I stood eating my lunch which wasn't horrible but not really fun. Another negative was the worksheet. The first time around the canyon was so fast there was no way to be able to draw or write down information. It was a bit frustating. And lastly I think that Mr.Olson should be leading the group always because some the the parents got lost and it was a tad bit confusing at some turning points.Overall a very fun trip!

View Mills Creek Canyon in a larger map

Mini blog post #1

For my first mini project i blew up a balloon and let the air out. But while letting the air out i hold two side of the balloon. Creating a rippling noise with the air.

For this project you'll need:
1. a balloon
2. air
3. a pair of hands :)

To do:
Take the balloon and fill it with air. Then slowly release the air with your hands. But while releasing the air pull the balloon elastic out to the side and slowly release, creating a rippling noise.

science?

the science in the project deals with surface area. The tighter the balloon is srteched the more noise it makes. less surface area less noise, more s.a more noise. These concepts are directly related.
Photocredit: Jensen Li

I propose we ..... put a needle through a balloon (without popping the balloon)

Links:

1.http://scifun.chem.wisc.edu/homeexpts/needle.htm
2.http://scifun.chem.wisc.edu/homeexpts/homeexpts.html

Materials:

• balloons


• long wooden or metal skewers


• pertoleum jelly a sharp pin


• cellophane tape

Procedure

1. Blow up a balloon and tie it close.


2. Take the skewers and dip the tip in the petroleum jelly, spread the rest of the jelly on the skewers.


3. Carefully take the skewer and push it gently through the balloon.


4. Push the skewer through the top and gnetly through the knot of the balloon.


5. With the skewer push it through in a twist motion.

Saftey Precautions:

• Be careful not the poke yourself with the skewers.

Scientific Principles:

The reason why the balloon pops with no petroleum jelly is because it breaks the long polymer chains in the rubber. The molecules in the balloon consist of cross linked polymers. When the tension on the cross-links is too much, the cross-links will break and pull-apart.

CAHSEE scores

I was so excited that i passed the High school exit exam! Though i did ok, i passed the test with a over average score. The test went ok and my parents are very happy with my scores. I received a 395 on the English portions and a 404 on the algebra portion. Its not great but at least i passed!!!!