Pd+3+Group+4

Kalee, Kayse, Lenora, and Amanda Marking period 3 1/31/11 []

~ In our boat lab we filled a tub with about a half inch of water and we cut a piece of paper in the shape of a boat. Then we placed the boat into the water and it floated. Then we got a toothpick and dabbed it into soap. We put the toothpick with soap on it behind the boat and the boat moved forward. The reason this happened is because the soap removed the surface tension behind the boat causing the tension to break and the boat to move forward. (inch) || ~ Hypothesis: The soap will not affect the boat in anyway. ~ Constants: type of paper we use, soap, container, and the amount of water. media type="custom" key="8515042"
 * Size || Trail 1(inch) || Trial 2 (inch) || Average
 * Small ||  ||   ||   ||
 * Medium || 12 ||  ||   ||
 * Large || 3 || 2.5 ||  ||


 * Elemental Friends and Foes**
 * **Elements can be harmful by large amounts stressing the body's normal methods for eliminating toxins.**
 * **Harmful elements can build up in body tissues.**
 * **Calcium is essential for healthy bones and teeth.**
 * **Blood cells would not mature without cobalt.**
 * **Nerves and muscles require magnesium to function properly.**
 * **Arsenic has been known to be a poison for centuries.**
 * **Mercury is toxic and can damage the brain and nervous system.**
 * **Too much lead in the bloodstream can lead to organ damage and learning difficulties, especially in young children**
 * **The six major elements are hydrogen, ozygen, carbon, nitrogen, phosphorus, and calcium**
 * **The lesser elements are iron, potassium, zinc, sodium, sulfur, chlorine, and magnesium.**
 * **Trace Elements: vanadium, chromium, molybdenum, manganese, cobalt, bopper, boron, tin, silicon, selenium, fluorine, and iodine.**

Click on the link below to see the model of the atom by Bohr!!



John Dalton thought that atoms were solid spheres. J. J. Thompson discovered electrons. Ernerst Rutherford developed a more complete understanding of the structure of atoms. Neils Bohr proposed that electrons orbit around the nucleus. Electon cloud is the region where electrons would probably be found swirling around the nucleus.
 * __Movie Notes:__**

**__ Our Atomic Party __**

Rutherford called six of his friends. Rutherford called Democritus, Bohr, Schrodinger, Heisenberg, and Thomson. They decided to get together for an atom celebration party. Each of them brought one food representing their theory. Dalton brought brownies representing how he thought that combining different substances because they are all made of atoms. To make brownies you must combine ingredients to get the batter. Thomson brought plum pudding because he made a theory based on plum pudding. Democritus brought M&M’s to represent his theory that atoms were small, round, and hard. Bohr brought a sandwich to represent his theory electrons can jump from level to level just like a ladder and layers of a sandwich. Schrodinger and Heisenberg brought cotton candy representing their discovery of the electron cloud. Rutherford brought jello representing his theory that atoms were soft “blobs” of material. For decorations there was polka dot balloons to show Thomson’s theory that the atom has electrons. A piñata that looks like Rutherford’s model of the atom. A game that is going to be played is charades. They are going to play charades because everything they act like is made of atoms. Electron cloud pencil drop graph by Courtney and Lenora

Our comic story :)

__**Density-**__ The mass per unit volume, D=m/v (g/cm3) We measured the density of water, oil, and hand soap two times. We found the density by measuring the mass of each liquid twice and we divided the mass by the volume. After that we took the data and found the averages of each liquid.

__**Density of Clay-**__ 1.74 g/mL __**Hypothesis-**__ If the boat is steep it is more likley to float however, if it is flatter it may not.

__**Why do Scuba divers need to wear weighted belts?**__ If scuba divers didnt wear weighted belts, they would never be able to get or stay underwater. The weighted belt counteracts with buoyancy. The mass of the diver is much heavier with all of the weight and gear on them and the weighted belt make it perfect for them to stay under water. The density is affected because the mass and volume of the weighted belt depends on the weight of the diver. The heavier the diver, the less volume of the belt.

__**Buoyancy-**__ the upward force that keeps thing afloat. Click here for pictures []
 * __Counteract-__** To act aginst; opposite.

Submarines surface by blowing high-pressure air into the ballast tanks. As the air replaces the seawater, it becomes lighter, making it rise. To dive, the ballast tanks open and seawater fills it up. Since water is more dense than air, it sinks. [] []
 * __Explain how submarines dive, surface, or stay level using ballast tanks.__**

Click here for pictures

__**Heating a Liquid Lab **__ Our Graph  __**Boiling different volumes of water **__ We used 100 mL of water for our volume. It took 12 minues to boil.

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