Pd+3+Group+6



__**Notes on Surface Tension:**__ Surface tension allows water to have resistance to external forces. An example of surface tension in action is when water spiders glide on top of the water of a small pond or creek. They rely on the surface tension to hold them above the water even though they may be denser than water. The object placed on top of the water experiences a pull from the different molecules in every direction creating the surface tension and allowing the object to float. If another solution is placed into the water this hydrogen bond will be broken and it will distroy the surface tension. You can also see surface tension when water drips out of the tap. The droplets are in a spherical shape because of the surface tension acting on them. For our experiment we tested surface tension by setting a paperclip on top of the water. Then we took soap and placed a drop behind the paperclip. The result was the paperclip moved forward. Then we tested putting a drop of soap in the center of the paperclip. Innitially it moved around in a circular motion, but then after a few seconds it sunk to the bottom of the beaker. This was because the soap distroyed the surface tension allowing the paperclip to finnaly sink.
 * __Our Experiment:__**

Notes on the Elements:
Elements are friends because they make up our bodies, and provide us with the nutrients we need to survive on a daily basis. The main elemtents that make up your body are hydrogen, oxygen, carbon, nitrogen, phosphorus, and calcium. Some elements that we need on a daily basis include iron, potassuim, zinc, sodium, sulfur, chlorine, and magnesuim. On the other hand elements can be very dangerous because some of them are poisonous and can even kill you if you have a very high intake of them such as; lead, mercury, and metalloid arsenic. Even some of the elements that we need to intake on a daily basis can be harmful to us if you have too much of it. Some of the results of too much of these elements can be high blood pressure and nerve damage.

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1/31/11 Movie Notes!: J.J. Thomson found out that atoms were not simple solid spheres.  He discovered Electrons: Electrons are small particles located outside of the nucleus and have a negative charge. Ernest Rutherford: Developed a more complete understanding of the structure of atoms. He founded that the smallest atom, which is hydrogen nuclei go through a gold metal sheet, just as he suspected. Whatever repels it has a positive charge. Positively charged center of the atom is the nucleus.

Nelis Bohr: Proposed that electrons orbit around the nucleus. He stated that if each electron has a fixed amount of energy.. so the orbit is the energy level which different layers is where they can be found.

Morgan, Linzi, Karley, and Taylor

= Experimental Design = = Density = 1. Question: How does the density of water compare to the density of the liquids and solids? 2. Hypothesis: Water will be more dense than methonal, but oil, a metal prism, and a plastic prism will be more dense than water. 3. Independent Variable: The different liquids and solids being tested against water. 4. Dependent Variable: The density of each object being measured. 5. Constants: Always compare the different liquids and solids to water. Always compare the densities to the same amount of volume.

Results: A platic prism and a metal prism are more dense than water, but oil and methanol are less dense than water.

media type="custom" key="7302635" Why Does a Boat float? Question: What makes the clay boat float on the water?

Hypothesis: The shape of the clay makes the clay boat float. This is because air is in the curve of the boat, and air is less dense than water, so it causes the clay to float.

Conclusion: The boat floats because the density of the boat is less dense than the density of the water. It is less dense because the boat has air in it along with the metal or steel that it is made up of, due to the fact that air is less dense than water. It also has to do with water displacement. This is involved because when a boat is dropped into water the boat pushes all of the water out of the way. That's water displacement. An object will sink if it weighs more than the water it pushes away, but if the object weighs less than the water it pushes away, it will float! Use Density to explain why helium balloons float in the air.

~because helium is less dense than air, a helium balloon will float. [|Why helium balloons float] <that's a link:)

Question: How does Charles law contribute to why hot air balloons flaot in air?

Answer: Charles law explains that when pressure remains constant the volume and absolute temperature of a certain quantity of gas are directly proportional. A hot air balloon floats because of his law. The gas in the balloon heats and expands so it floats because the surrounding cold air is less dense.

__** Links: **__ []

[] BOILING LAB In our experiment we boiled water in a test tube and observed the rise in temperater over a certain amount of time. We also caught the water vapor in a separate test tube in an ice bath witch condensed back into water.

__**Conclusion:**__ In the end the temperature of the water rose quickly and once it got to boiling point remained the same temperature.

Question: ﻿ How does the speed of a paper fan affect the tempature sensor? Hypothesis: The faster you move the fan, the faster the tempature of the tempature sensor will decrease. Independent Variable: The speed of the fan.


 * Levels || None || Slow || Medium || Fast ||
 * Trials || 2 30 sec. trials || 2 30 sec. trials || 2 30 sec. trials || 2 30 sec. trials ||

Dependent Variable: The temperature of the sensor. Constants: Same person fanning, same style of fanning, fan from same spot, small movements.

Boiling Point Lab

We had a beaker full of water at 150mL. The water started to boil at 15 minutes and 43 seconds.

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