10/11/11 Chemistry

Today 10/11/11


Mrs. Sorensen was not here today and we went in the library and did the quiz things.
In Chemistry we took 2 assessment quiz like things.
We couldn't do some of the question on the States of Matter Quiz because there was no graph and you were supposed to answer the question and to get the information you had to look at the graph. The 3 questions you couldn't answer are #1,14,20.

Monday, October 10th, 2011

Today we are making a spreadsheet over our vaporization lab. My partner and I did methanol and water. We recorded the time and temp. Then we discussed what flubber and ooblec was-liquid, or solid. Flubber stretched if pulled slowly, but broke if you pulled it hard and fast. Also it took ink. It can also bounce. Oobleck is runny, but if you shake it, it will stay in the container.

Vaporization of Liquids

Vaporization of Liquids

In this experiment we tested the temperature of which each liquid vaporized. In my group, we tested Acetone and Ethanol.

Materials Needed:
5cm^2 of Paper Towel
Liquid of Choice - (Ethanol/Acetone)
Non Latex Rubber Bands
Graphing Calculator
Temperature Probe

Procedure:
The first step that you need to do is attach your temperature probe to your graphing calculator. You choose the option for it to record every .5 of a second, and set it to graph for 2 minutes (120 Seconds). You take the end of the temperature probe and put the 5x5cm of paper towel on it. Use the rubber band to secure it to the probe. Once you have your probe all set up, you dip the end into the liquid and hold it in for about 3 seconds. after this, quickly lay it down flat on the table and do not move it. Drafts in the room can affect your data because the wind can cool it down faster. Once you've got this all done hit start on your calculator and then wait till it gets done. Then record your results.

Karsyn Blog for 10/7/11

In class today we finished up the lab vaporization of liquids. We found the temperature change of 2 different liquids in two minutes.we also finished up the oobleck lab and the flubber lab.

To make Oobleck:

• Dixi cup of water


• add corn starch


• stir

To make Flubber:

• 30 ML of water


• 2 spatula scoops of borax


• heat


• 60 ML of glue


• 30 ML of water


• stir


• add 2-4 drops of food coloring

Wednesday Oct 5, 2011

Today in Chemistry Mrs. Sorensen was gone. Mr. Blythe was the teacher. We ended up not finishing the flubber and Oobleck, but we will finish it Thursday Oct 6, 2011. We watched Mythbusters and had to answers 10 questions about one of the myths that was tested.

10/4/2011 Chemistry

Today in chemistry, first we went to page 399 in the textbook and discussed the states of matter.

Solid: amorphous or crystalline, definite shape and volume

Liquid: no definite shape, definite volume

Gas: no definite shape or volume

Discussed information:

The density of solid materials is usually more dense than the other states of matter, with the exception of water and some other materials. Water expands as it freezes, instead of shrinking in volume like most materials. This is why ice floats. Crystalline solids have molecules that are arranged in a repeating pattern. Most solids are crystalline. Mrs. Sorensen makes an analogy between little kids and the states of matter, in warm weather they run around (like a gas' molecules move quickly with no order), in fall temperatures they kind of huddle up, but still run around a bit (like a liquid's molecules), and in winter they huddle up (like a solid). Crystalline solids sometimes form crystals. We briefly discussed what a unit cell (page 400) was, and then we read about amorphous solids (page 403). We discussed how the myth started that glass is a liquid, but it is actually is an amorphous solid, and how some old textbooks say that it is a liquid. This myth was started by the observation that in old houses, the bottoms of the windows were thicker than the tops. We also discussed that the bigger the crystals, the more imperfections that they have and the less clear they are. Mrs. Sorensen also has two bouncy balls, one that is a "happy" ball and one that is a "sad" ball. They look exactly the same, but the "sad" ball is an amorphous solid and the "happy" ball is a crystalline solid, and the "happy" ball bounces and the "sad" ball does not.

(page 397) We also discussed viscosity, which is a measure of the resistance of a liquid to flow. Mrs. Sorensen also "raced" marbles inside of graduated cylinders with different liquids inside. Two of the liquids did not allow the marble to quickly move down, and they went very slowly. One of the liquids had a dent in the surface because of the marble impact. Seth dropped his marble too quickly and we had to retest between him and Brandon, with the result that Brandon's was found to be faster. Dustin's marble was in 3rd place, and Carson's marble was last. The fastest liquid was water, the second fastest was bubble water, the third fastest was corn syrup and the least fast was Germ-X.

Later, we started to make oobleck and flubber.

Oobleck:

Dixie cup + water + corn starch + stir

Flubber:

Person 1:

30mL water + 2 scoop spatulas of borax + heat (be careful) + stir while being heated

Person 2:

60mL glue NOT IN GRADUATED CYLINDER (measure 60mL water, put in a Dixie cup, mark level with sharpie, empty cup, fill with glue up to mark) + 30mL water + food coloring + stir

yay! finished the polls today, remember flamibility and reactivity are chemical properties not physical.

we also talked about the molecular structure of solids, liguids and gases. Solids are tightly packed and vibrate slowly, but not all solids are egually. There are amorphous, which are tightly packed but are disorganized, while crystalline are very organized and tightly packed.

Liguids are further apart then in solids and they slide and glide passed each other.

They have no definite shape, but they have a definite volume

Gases have no definite volume or shape!

They are very loosely packed and are shooting all over the place

and that's it for today!