Monday, November 23, 2009

Chemical Reactions Narrative.

Our goal for this lab was to hit the window three times in a row with a cork using chemical reactions. The supplies that we had to work with was vinegar, baking soda, a test tube, and a cork. Our first attempt to hit the window was to have 12 ml of baking soda, and 20 ml of vinegar. That try was pretty good, we got 614 cm. Our next try was way worse. We thought it would be better if we had less vinegar and baking soda. So we put 7.5 ml of baking soda and 12 ml of vinegar. But we then realized that less substances meant less pressure which brought us down to 270 cm. We decided that we should just raise the baking soda to 10 ml and keep the vinegar the same. That was worse than our second attempt. We got 269 cm. This time we kept our baking soda the same and raised our vinegar to 20 ml. That try was almost as good as our first try, because we got 545 cm. We decided that we should keep our measurements the same, but to make a bigger reaction, we needed more baking soda. So we raised it up 2 ml. That was our best so fare. We got 687 cm. Even though we did good on that one, we decided to change it. We left the baking soda alone and lowered the vinegar by 8 ml. We got 150 cm. Next, we put the vinegar back to the way it was before and raised the baking soda by 1 ml. Right as we were about to shoot, our cork got stuck so we got 0 cm as our distance. We had lost hope by then, but then a miracle happened. We hit the window. We hit the window by going back to the basics, which was our first try. Next, we hoped to hit the window again, and we did by keeping everything the same but raising the vinegar by 2 ml. If we hit the window one more time. We would get our extra credit. We used the same measurements, but this time our angle was off, so we only got 540 cm. We used the same measurements once more and we hit the window. We hit the window once more using the same measurements. We only had one more chance to hit the window. We decided to use the same measurements because we hit the window four times with those measurements. We shot the cork and it was about to hit the window, but it hit the metal part of the bottom of the window and bounced onto the window. We thought we lost it, but our science teacher let us have it. So in the end, we got our ten points extra credit for this assignment.