Pd+3+Group+3

Emily, Tori, and Courtney

4) Too much can be really harmful and the Food and Drug Administration has guidelines on the safe daily amounts to take in food.
1/31/11 1. Atoms are impossible to see, so indirect observation is used. 2.Carbon dioxide, water, and helium are all pure substances, which are matter made of one kind of material with definite properties. 3.All objects are made of matter and all matter has volume and mass.

__** Indirect Observation Lab: **__
 * In this lab, we had a wooden board over an unknown shape with a piece of construction paper on top. We had to roll a marble under the wooden board to see where the marble bounced off and came out. We recorded this on the piece of paper. **
 * Our manipulations were that we were going to roll the marble four times on each side. **


 * Here is the picture of our lab... **

Atomic Party Comic Strip: media type="custom" key="8281090"

Electron Cloud Theory Pie Chart: 



marking period 1 notes
media type="custom" key="7847735"

This is a graph o n densities of different objects.

Questions: 1) Would methanol be lighter than other liquids other than water also?

New Lab after having this question: To see if cooking oil is more or less dense than the methanol.

Notes: Since cooking oil and methanol are the same general color, we added blue food coloring to the methanol so that we could tell a difference between the two when comparing them. Now the methanol is a dark blue color, rather than yellowish.

Question: Would cooking oil be less or more dense than the methanol? Hypothesis: The cooking oil will be more dense than the methanol. Results: The cooking oil was underneath the methanol in the beaker, meaning it was more dense than the blue methanol.

New Lab after adding cooking oil: To see if methanol is is lighter than both the cooking oil and a new substance added, which is corn syrup. Hypothesis: The corn syrup will be more dense than the methanol also. Results: The cooking oil and corn syrup were both located underneath the methanol in the beaker, meaning they were both more dense than the blue methanol. New Lab after adding both substances: To see if we can seperate the three substances and place them into different cylinders. Steps we took: 1) We first took the blue methanol that was ontop out using pipettes and placed it into a beaker. 2) Then we took the cooking oil that was in the middle out using pipettes and placed it into a seperate beaker. 3) Last we just left the corn syrup in the original beaker because it was on the bottom.

We Leaned: 1) We can successfully seperate substances using pipettes. 2) Cooking oil, corn syrup, and methanol do not mix since they have different densities. 3) Density is a physical property.

Chemical Lab: We are trying to get the clay to float on top of the water by forming different shapes with an air pocket in the middle of the clay.

Volume: 3 mL Mass: 4.9 g  Density: D=m/V, D=4.9/3, D=1.63 g/cm3

Question: What makes a clay boat float? Hypothesis: The density of the part of the boat underwater determines whether it will sink or float.

the green boat foated the blue boat sank the green boat displaced more water so the the blue bout displaced less water buoyancy kept it afloat so the less amount of buoyancy didn't keep it afloat

Researched Question: Why do boats float even though they are made of materials that are more dense than water? Answer: They are hollow meaning the air inside the boat makes them less dense than they appear. Also, the weight it spread over a large area, keeping it on top of the water. [|Where we found our information:]



reserched question:use Archimedes principal to explain how boats float. the principal states that the boyant force on an object in a fluid is an upward force equal to the wieght of the volume of fluid that the object displaces. so, when the boat is on the water is displaces water so the boyant force of the displaced water pushes up on the boat and keeps it a float. the wieght of the volume of the water displaced is the same as the wieght of the boat underwater.

= marking period 2 notes = Heating a Liquid Lab: <---Click here to view our screen shot What we did: In this experiment, we had to boil water over an alcohol burner. There was a thermometer taking the temperature in degrees Celsius. The water that was boiling in the test tube had a rubber stopper with a tube running into the test tube in the cold water bath. The object of the experiment was to get water into the test tube laying in the cold water bath. Our results For the last few minutes, the temperature remained constant at 100 degrees Celsius. We had no water in the testube in the ice water bath. Our results did not turn out as planned