Every time we look outside or open our eyes chemical and physical changes are all around us. Four labs our class performed showed this to us in many different ways. To the right is the process names for physical changes. When our class melted our birthday candle it underwent a physical and chemical change. The physical change was when the candle melted from a solid to a liquid . As you can see on the chart to your right it did soon become a liquid. The chemical change occurred when the candle burned. Basically the chemical build up was changed and that is what a chemical change is. In our next lab my group mixed vinegar and baking soda together to form carbon a non-flammable gas. This gas extinguished the fire. This information can help us in the future because know we know that carbon can be used to put out flames. If you have a kitchen fire and know water is available you can just mix to two ingredients and smother the oxygen around the flames. Our next lab was roasting marshmallows and what we did was put a Bunsen Burner underneath our marshmallow and set them ablaze. We found out that the marshmallow melts while over a fire. The fire changed the chemical make up of the marshmallow and made it very gooey. Our final lab was heating sugar in a beaker. When the sugar heated it turned into brownish yellowish liquid. When we kept heating it the liquid soon evaporated leaving us with black powdery stuff. After inspecting the black stuff we learned that it was carbon left in the beaker. This can help us in the future because understanding chemical and physical changes will help our daily lives. For example, if we do not want our car to rust we cannot let the car be exposed to water and oxygen.

Procedure to Seperate Mixture

1.) First use your hand to pick the toothpicks out of the water. The toothpicks float so this will be an easy step
2.) Use the spoon to scoop the kidney beans out of the water. Put the kidney beans in your flask
3.) After you do that, put the magnet into the cup. The iron fillings will stick to the magnet. Just keep the fillings on them.
4.) At this time, pick the bug out of your mixture. (The bug is plastic.)
5.) Put the paper in the funnel. Underneath the funnel should be the beaker. Make sure the paper is cone shaped and pour the water into it. The sand will be free of the water and will stay there. Keep the sand on the filter paper.
6.) Put the beaker on the hot plate and turn the hot plate on.
7.) As soon as the water evaporates you will be left with salt.(Seven items found!)
8.) Make sure to clean up so your teacher does not become mad.

Response to frog dissection lab

Wow! When I walked into my science class and learned about our digestive system, I thought that because we are the most complex system no one has the same intricate system. Little did I know that we were about digest two bodies that similar body parts to us. The frog as seen to the right has all the major parts as the human, seen to the right of the frog. The disegtion of anything starts with the espohagus. Both bodies have this. The most important part of the digestion system is the small intestine and stomach. The frog shares this with the human as seen to the right. I was shocked to find this out because the frog is a primitive system. Even as though that may be, the frogs share many organs with us. Sure there are some differences with both systems, but all in all the two bodies are very similar. This absolutely blew my mind. When my group and I started to create the first incision I was surpised to find out how easy it is to cut their skin. As we continued to cut and explore our specimen I became more relaxed and soon I did not care when frog juice squirted on my hand. When we took out the stomach I was very happy to see that their was a piece of food in the stomach. Unfourtanetly, our frog had waste products still lodged in the large intestine. That was disgusting. But all in all, I found this lab to be most informative. I have learned that we are not so different to many organisms. Although their bodies may be primitive, they are like ours.

For more information check out these websites:

http://www.biologyjunction.com/frog_dissection.htm

http://www.mhhe.com/biosci/genbio/virtual_labs/BL_16/BL_16.html

http://froggy.lbl.gov/cgi-bin/dissect

Digestion Lab

In this lab my classmates and I used the actual acid in our stomach called hydrolic acid. The purpose of this lab was to figure out what combination of digestive juices would break down the egg whites the quickest. Beakers C and D digested the egg whites the quickest. Beaker C only had hydrolic acid and Beaker D had enzymes and hydrolic acid. Now Beaker C broke down the food just a bit quicker, but I thought Beaker D would break down the food quicker because stomach has enzymes and hydrolic acid. This was our Digestion Lab.

Chicken Wing Lab Dissection

This lab's purpose was to show how the muscles work. I learned that the muscles work by making one muscle contract while the other relaxes. Our science teacher showed us this by dissecting a chicken wing. Another purpose of this lab was to show how our body also works. The chicken is very similar to our arm. We have bicep and tricep muscles, and chickens have the same thing. We have cartlidge between the bones and so does chickens. I was not expecting the chicken to have almost the same parts as us humans. The only difference between the two is that a chicken wing is smaller and basically a miny size. This was our chicken wing lab dissection

Science project

Science project!!! Made from postermywall.com

Response to science lab

This science lab is about chemical reactions. Our teacher split everyone into groups of three or four people. After she split us up, we followed the procedures on our sheet to change the color of the starch. We poured ten drops of iodine into our beaker that was filled with water. After that we put a plastic baggie into the mixture and waited fifteen minutes for the chemical reaction to occur. After my group took our bag out of the water we saw that their was an immediate change in color to our previously milky white starch. It had turned dark purple! We concluded that the baggie was permeable to the iodine. The iodine was able to seep through our baggie and change the color of our starch. That was our science lab.