Katie

__15 May 2009__ One thing that I learned about in science this week is the organs of a frogs body. Some organs in a frogs body are fat bodies, peritoneum, liver, heart, lungs, gall baldder, stomach, small intestine, duodenum, ileum, mesentery, large intestinen, spleen, and esophagus. The duodenum, ileum, and mesentery are all parts of the small intestine. Another thing that I learned this week in science is how to cut open a frog. You have to put the frog on the dissecting pan with it's ventral side (stomach) facing up. Then you use scissors to life the stomach muscles away from the body. You cut along the middle of the body. Once you have a straight line down the middle you make transverse (horizontal) cuts by the arms and legs. After making these cuts you lift the flaps of the body wall and pin them back. One thing I'm not sure about is how scientists have come up with the idea that the theory of gravitation might be wrong. I don't get how the theory can describe everyday effects on gravity on Earth, but that's it. __23 April, 2009__ One thing that I learned about in science this week is the forms of energy. There are two forms of energy. One form is Kinetic energy and Potential energy. In Kinetic energy there are five different things under it. Energy of motion (moving objects), radiant energy (electromagnetic energy), thermal energy (vibrations of atoms), sound energy(compression waves), and electrical energy (movement of electric charges). Under Potential energy there are four things. Chemical (stored in a bond between atoms), gravitational (energy of position or place), nuclear (stored in nucleus of atoms), and stored machanical (stored in objects.) Another thing I learned in science is how to balance equations. When you're balancing an equation you want to have the same number of carbons in the reactants, and the products (the right and the left.) If you don't have an equal number of the chemical on each side you would have to add another product to balance it out. One thing that I need to work more on, even though I learned it, is how to balance equations and how to write out the equation. I have somewhat of an idea, but I couldn't do it without help. If I had to do it alone, I would probably fail. __ 17 April, 2009 __ One thing that I learned in science this week is that when you're drawing Bohr modles. When you're drawing a Bohr moddle you can look at the element name and find which period it is in. If you were drawing Meitnerium (Mt), you would draw seven electron shells. I aslo learned that the first shell can only have two electrons in it. The second and third can have eight, and the fourth and fifth can have eighteen. Another intresting thing that I learned in science is how to tell a metal, non-metal, and metalloids apart. I learned the metals tend to be shiny, are ductile, and good conductors of electric current, most metals are malleable, and they are good conductors of thermal energy. Nonmetals are not malleable or ductile; some are brittle, they arn't shiny, and they are poor conductors of thermal energy and electic current. Metalloids can be shiny, but brittle, hard, and can also be a good conductor of electic current. An example of a metal is Aluminum. An example of a nonmetal is Sulfur. An example of a metalloid is Tellurium. One thing that I don't quite get is how to figure out the number of protons and neutrons that go in the Bohr modles. I thing you just subtract the Atomic number from the Atomic mass, but I'm not exactly sure. __13 April, 2009__ One thing I learned about in science last week is how to draw a valence electrons using the atomic number and atomic mass. I learned that the first valence shell can have two electons, the second and third electrons can have up to eight electrons, and the fourth and fifth can have up to eighteen elctrons. I also learned that the nucleus is made up of postive and negative charged particles. Another thing I learned about last week in science is the parts of the Periodic Table. Some parts of the Periodic Table are the chemical symbol, periods, and the groups or families. The chemical symbol is normally a two letter symbol with the name below it, the atomic mass, class based on box color, atomic nunberm abd the state of the element at room temperature. The periods are in a horizontal row, the properties of metals on left changing to non-metals on right, and each row has a similar pattern of propterties. The groups or families are in a vertical column with similar properties within a group, and there are eighteen groups. One thing that I'm curious about are Ions. I looked through the book and couldn't find any information about them. One thing that I do know about Ions is that they are charged particles.