Chemical and Physical Changes (Matter)

           Last week we worked on four labs that showed us chemical and physical changes.The first two were candles, the third was roasting marshmallows, and the last was burning sugar they all showed both chemical  and physical changes. 
This is physical change:                                                 This is a chemical change:

                 The small blue candle was the one we did first. We had to watch it burn down and melt. It was chemically changing because it was burning it was physically changing because it was getting smaller. The second candle we did was a big white one we mixed 2 substances together and held it up to the candle flam without letting the substance fall onto the flam. The flam instantly blew out and we repeated this proses again we got the same result the candle instantly blew out. Like the little candle when the candle was burning it was chemical when not lit physical. When we mixed the two substances it was chemical candle  because the chemical make up was changed.  When something burns it is always chemical change.

burning candles

          The next lab was burning marshmallows . We had to taste marshmallows that were not burned and then taste burned ones. Before it was burned it was white and fluffy after burned black and charcoal. This was a physical change the appearance was changed. This was also a chemical change because it was burned. Before being burned the marshmallow was sweet and sticky after being burned gooey and tasted like char coled burntness. This lab was easy to relate to real life because I love making s'mores. 

  burnt marshmallow

burnt sugar

             Lastly, we had on a sugar lab in where we burnt sugar. We put two sugar cubes in a test tube and held them over the Bunsen burner. The sugar was boiling and caramelizing. The sugar was at about 300 degrees, and yellow smoke started puffing out of the top of the test tube. I thought it was going to blow up but fortunately it didn't. We put the test tube on the table and smashed it with a hammer. The sugar was chemically changed it was blackened and stuck to the sides of the test tube. This lab was fun but i learned a lesson from it when working with sugar just a little burnt could make it taste horrible and not be able to do what i want to. 

             All four of these labs tought be about chemical and physical changes. I will apply what i learned to real life now. These are all in different states of matter. These labs were fun and educational, i hope in the future we do more labs that are this much fun!!!!!!!!!!!!!!!!

Separating Mixtures Procedure

Step 1: With fingers remove toothpicks, beans, and plastic spider.
Step 2: Fold filter in fourths and put it in beaker, pour the water mixture into the beaker.
Step 3: Take filter out of beaker, put it to the side.
Step 4: Put magnet over cup to remove iron shavings so only sand is left in cup.
Step 5: Plug in heater and place the beaker on it with just the water mixture inside.
Step 6: When the water completely evaporates take the beaker off the heater. (Remove with beaker tongs)
Step 7:  Wait until it cools and then look inside the beaker and try to figure out what is left.
Step 8:  Secret ingredient is salt.
Step 9: Make sure all step are recorded so you can tell others.
Step 10: Clean up.

FROG DISSECTION

On Wednesday and Thursday we dissected frogs. The point of this dissection was to show us what the inside of the frog looked like and that our bodies insides looked very similar, to the frogs. The human and the frog have the same parts so their functions should be the same. I learned how my bodies systems/functions worked after looking at the frog. Even though I didn't watch the whole dissection in my frog i still learned by dissecting on the Internet. The frog  and the human both have the stomach so I learned that the stomach is a small sack in our bodies. The function is to break down food in the process of chemical digestion, this accrues in the digestion system. We both also have livers and gallbladder. The liver produces bile and cleans the poisons out of the body. the gallbladder than stores the bile. My group got a female frog, so after seeing the eggs I couldn't handle the smell any more, so I learned all about the insides of the frog online. It was very helpful having the website:  http://frog.edschool.virginia.edu/Frog2/.    When my group open the frog I thought that the eggs would be in one sack and I wouldn't even see them, but I was proven wrong when there where black little eggs everywhere. You had to remove all the eggs so you could see the other organs. Under the eggs was the liver, stomach, small intestine, gallbladder, ect. Online when they cut open the stomach nothing was inside, I was expecting to see something maybe a bug or a mush of black gunk or something. I was definitely shocked when the stomach was empty. I guess the frog had not eaten when it died, but i don't know. I was hoping to see food in the frog because than i could see what the, frogs were eating. The frog dissection lab helped me get a better understanding of my body, and how my systems/functions work. This lab was not my favorite because the smell didn't work with my stomach or my head. I could have done without the dissection but then wouldn't know anything about myself  so I am happy we dissected even though I wasn't feeling great. http://www.teachkind.org/FreeDissectionAlternative

(open frog)

10-11-11 science lab

In science class today we preformed a lab using iodine. First, we filled a plastic bag with corn starch and water. After we tied a knot in the bag, we placed it in a beaker with water and iodine. After 15 minutes of waiting we took the plastic bag out of the beaker our results were shown. Our lab was successful when the corn starch turned purple because the iodine seeped through the bag. This was what we did today in science.