Yesterday we did a lab that involved dry ice which is frozen CO2. The first activity we did with it was to place the dry Ice into water so that we could observe what happened. What I observed was that as soon as we put it in the water it constantly gave off a large amount of water vapor. It was turning directly from a solid into a gas. Also because gasses are less dense than solids, the vapor took up much more space. The volume of the solid was much smaller. To determine exactly how much more volume the gas took up, we did another experiment. We measured the volume of a 2" piece of dry ice by using the equation: 3/4 x pi x r cubed. Using this equation we figured out that the volume of the 2" piece was around 13.08 cubic centimeters. We placed the 2" diameter piece of solid dry ice into a ballon and then closed the ballon so that when the dry ice turned into a gas, it would expand the balloon. After the dry ice had fully sublimated (gone from a solid to a gas) we measured the diameter of the balloon and it was approximateley 20 cm in diameter. To determine the volume of the balloon we used the same equation as before and learned that the volume of the sublimated dry ice took up a volume of 13080.77 cubic centimeters. That means the solid form of co2 is 1000 times more dense than the gaseous form. This illustrates that the molecules in a gas are much much farther apart than those in a solid.
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MeHi I'm Garrett Archives
May 2015
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