Density!

Friday turned out to be an interesting day. We started class by going to the Math Lab to make our first graph for the Density Lab we had done on Thursday. If you need help making the graphs go to Moodle. On this Mr.Lieberman said he would make a Screen Cast on how to make the graphs. After we printed out our graphs we went back to the classroom to start our new notes on density. Below our the notes we did:

Density

View more presentations from gbsliebs2002

The first part was density. Density is the amount of mass is in a certain amount of space. To get a better understanding of density. Mr.Lieberman did a demo for us. For his demo, he filled to beakers with unknown liquids. In each beaker, he dropped an ice cube in it. In beaker left, the ice floated to the top of the liquid. In beaker right, the ice cube dropped to the bottom. From this we could conclude that liquid left was denser than liquid right. We knew this because in liquid left the ice cube was less dense than the liquid while in liquid right the ice cube was more dense than the liquid. From that we were able to come to that conclusion. We later found out that liquid left was water and liquid right was alcohol. Not just any type of alcohol but the kind that is used to clean cuts.Before we could move on Amar B asked a question that lead to another demo. he asked that if the alcohol and water were put together, would the ice cube stay in the middle. The first time Mr. Lieberman tried to do the experiment noting really happened. This is because the alcohol that was used contained water in it. For this reason the two liquids mixed together. However Mr. Lieberman was able to find alcohol that was stronger and he started over. This time when the two liquids were out together they did not mix. Though, it was hard to see so blue dye was added to the liquids. The dye mixed in with the alcohol. Now that the dye was in it was easy to see the separation of the alcohol and water. Next the ice cube was dropped in. The ice cube moved a little but settled at the middle right between the alcohol and the water.

The final thing we did in class was learn how to calculate density. Density equals mass/volume. To remember this more easily, Mr. Lieberman showed us the Density Mass Volume Triangle. With this triangle you can cover up the part you're trying to find and see what you need to do to find that. For ex. If I covered up the V in the triangle I would be able to see that to find V(Volume) I would have to do mass/density. We finished up doing some sample problems. These problems can be found in our density notes.
This has been AnnMarie C. The next scribe is Tom M.