Science Memes

Science Memes

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Pink Slime

This article was about pink slime, also known as "lean finely textured beef" and why people are questioning whether it is safe. Gerald Zimstein, a former USDA scientist made a great point in telling the countries attention and it certainly did work. This process was started at Beef Products Inc., in North Dakota. It began in the 1980's and the ammonia was added in the 1990's.
My opinion is that people are only thinking that it is disgusting because it has been labeled pink slime. All that this meat filler is is beef and fat scraps from the beef you eat all the time. They just use ammonia to kill bacteria in the meat. Also it is in normal beef from the food store. People been eating since the 80's! Lastly since it's lean meat without it in it beef has a higher fat content, making meat with pink slime a healthy alternative.

States of Matter!

States of Matter!

      This week we had four labs. The first one was examining the characteristics of a candle. The second one was putting a candle out using carbon dioxide. The third one was burning a marshmallow. The forth and final lab was turning sugar into carbon. The reason that we did these labs is so we could examine changes both physical and chemical. 

      In the first lab, we were each given a birthday candle. Then we had to write down the physical characterizations of the unlit candle. Some of ours were small, pink, swirly, and skinny. Then Mrs. Rousseau lit the candle. This was both a physical and chemical change; the wick burning is chemical but the wax melting is physical. 

      The next lab we did was putting out a flame with carbon dioxide or vinegar and baking soda. When you pretended to pour the mixture over the flame it went out. This happen because carbon dioxide doesn't support combustion. 

      Then we did the burning marshmallow lab. We used the Bunsen burner to burn the marshmallow. Then we tasted them. Even though it was burnt it still tasted good but... burnt! This was an example of a chemical change. When we burnt the marshmallow it was not a marshmallow anymore, it was char. 

     The final lab we did was burning sugar. first we put our sugar cubes in the beaker. Then we held it over the bunsen burner. The sugar went through many stages. We new it was done when there was yellow smoke. Then Mrs. Rousseau broke the beaker and we examined the 100% pure carbon!

http://www.exploratorium.edu/cooking/candy/sugar-stages.html

http://www.hschem.org/Laboratory/labs.htm

Separating Mixtures Procedure

1. Use pipette to remove water. Place in graduated cylinder
2. Remove toothpicks using hand
3. Take out marble with hand
4. Swirl magnet in cup to remove iron shavings
5. Remove sand with spoon
6. Take out beans with spoon
7. Fold filter into a cone and place in funnel
8. Put funnel in beaker
9. Pour water in funnel to remove rest of sand
10. Place water on hot plate. Let boil
11. When water has evaporated take off hot plate using tongs. Let cool
12. Examine whats left in bottom with magnifying glass ---> it is salt
13. Clean and wash all materials thouroughly.

Frog Disection

             In science we dissected a frog. We dissected a frog to learn about its organs and how they're similar to humans. I found this very interesting and fun. The first thing we did was put on gloves. Then we took the scissors and cut open the frog. Once we got the skin cut we pinned it down. After that we had to cut the muscle, being careful not to cut any organs while doing so. Then we pinned that down and had a full view of the inside of the frog.

             Once we could see the inside of the frog we had to take out eggs, oviducts, and fat. When that was done we took out the liver, which secretes bile needed for digestion. Then we cut out the stomach and intestines. Our stomach had no bugs in it. Next we examined the lungs, gallbladder, and  kidneys. finally we cut out the the heart. I pried open the mouth so we got to see the tongue. Overall this was a fun experience and I hope to do more fun things in science! 

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

Digestion Lab

Today in science we learned about the digestion system. In this lab we had 4 different combinations of pepsin, hydrocloric acid, egg whites, and water. We saw that the test tube with only hydrocloric acid dissolved the most.  This is like digestion because the hydrocloric acid dissolved the food and that is what happen in our experiment.