## Wednesday, February 16, 2011

### February 16, 2011

Today, we started class today by continuing working on this question:

In small groups, you will devise a plan on how to separate the following frozen mixture of sawdust, iron fillings, sand, and sugar.

Ever group discussed with there tables about how they are going to separate these.

Our group said that we would melt the ice cube in a glass container. The less dense material (wood) will be floating and we will scoop it out. Then we will use a magnet to attract the iron filling out of the water. Then we will pour the water, sand, and sugar mixture through a coffee filter and into a glass container so the sand and water/sugar is separated. After that, we will heat the water/sugar mixture. We predict that by doing this, the water will evaporate and the sugar would stay in the glass container.

After we came up our own experiments, we performed it. This experiment has to be done within the class period.

When performing our experiment, we were very careful when heating the water with dissolved sugar. Another group heated the water/sugar for too much and had the same outcomes as our sugar lab. I am not really sure about how to prevent this. Is there a certain temperature that sugar separates to carbon and water?
-AT 3rd Blog

1. im studying for the test i jst wanna knooo how particles move during convection? Anyoone koo?

2. Im not sure how the particles move, but for the definition of convetion I wote that it was the transfer of energy through a fluid, and my definition for fluid was something that can move freely. There was also an example in one of our homework assignments and it was from February 1st. The example was the first situation in problem A. and it said that the top floor of a house gets hotter even though the heater is on the bottom floor. I hope that helped.
-DB

3. I'm not sure if we will be working on this experiment tomorrow, but if we do, we burned our beaker and the sugar/sand that was in it. Is there any way to fix this?

-EE

4. Yea, I agree with DB that the particles transfer energy through and only through a fluid for convection. Also, the particles increase in speed and become more spread apart while energy is transfered to it but decrease in speed and density when the energy source weakens.

-BB

5. The particles move when they are heated up. Particles move slowly in solid matter, a bit faster in liquid matter, and really quickly in gas matter.

--JF