Icy hot patch or icy hot experiment

In Chemistry we did a lab called the " Icy Hot Lab". This lab was all about seeing the temperature of water as it changed from a solid from a liquid then a liquid to a gas. For this lab you need a Burner, matches, a breaker, ice, a computer, and a temperature probe. First you'll need to crush the ice and place the ice in to beaker. After place the temperature probe into the ice and plug the probe up to the computer so it can record the temperature on a chart as the time goes by. The most important thing about this lab is that you don't leave your station because sometimes the computer will stop recording, so you have to be there to restart and restore the graph so you don't lose any critical information. Before  we conducted the experiment the class hypothesized that the relationship wouldn't be direct but it would have an upward slope.

But the graph actually had plateaus and upward slopes.

The low temperature plateau was when the ice was changing to water,melting from a liquid to a solid, and had Eph- phase energy; arrangement of particles. The region of temperature change was when the water was stuck in the liquid phase and had Eth- thermal energy; particle motion. The high temperature plateau was when the water was evaporating from a liquid to a gas and had Eph. The last upward slope was when the water was completely evaporate to the gas and had Eth. So from the results we got our hypothesis wasn't that off. The reason I think the graph had plateaus when the water was changing phases was because the particles where just having space added between them and the upward slopes where when the water was boiling which meant the particles where moving faster.

The Deflated Can 🙊

In chemistry class we've been learning about the behavior of gas. We learned that the particle of gas are in constant motion they never stop. The paritcles could never lose energy because the have elastic collisions. That's when the particles collide and the energy is transferred to the particle it collided with. We also learned that pressure volume and temperature are all related. Temperature and pressure have a direct relationship. The higher the temperature the higher the pressure, the lower the temperature the lower the pressure. Volume and pressure have an indirect relationship. If there's more volume theres less pressure, if there's less volume it's more pressure. So we did this experience with a pop can. You first had to put 10ml of water into the can and put it over the flame.

You had to hold the can over the fire with the tongues until it started to boil. Ways you knew the water was boiling was because if you listened closely you could hear it, you could see the steam come out of the top of the can, or you would feel a tiny vibration threw the tongues. Once the water started to boil you would put the can face down into cold water. You couldn't just sit it on top of the water you would have to plug it into the water otherwise it wouldn't work. When you did this the can would deflate or crumble.

I believed the reason the can crumbled like this was because of sudden change of temperature. When you put the can over the flame it caused the particles to move faster and create more pressure because when temperature increases so does pressure. Then when you put the hot can face down in the cold water it was a change in temperature. So the particles slowed down a lot really fast causing the can to crumble. because the change was so sudden the can crushed.

Gases

There are gases you can see and some that you cant. For instance a gas you encounter daily is the atmosphere. You can see water vapor or steam but you can see air. The Kinetic Particle Theory of Gases describe and explain the behavior of gases.

• They are in constant random motion and are always colliding with themselves or the container they are in
• They have what are called elastic collisions and they never lose energy because when they hit each other there energy is transferred
• Gas particles don't stick together; they aren't attracted or repelled  by each other, they floe freely 
• Different particle move at different speeds and speed is related to temperature because heat gives the particle energy and cold decreases their energy
• Pressure is related to how many times the particles hit each other

Particles will move in a straight line until they hit another particle and deflect into another direction. When they collide they have an elastic collision which mean they bounce off each other and they never loss energy because when they collide the energy is transferred to the different particles. Gas particle don't stick together because they are constantly bouncing off eachother. When the temperature is increased the particle move faster and when the temperature is decreased the particles move slower. The pressure is related to the frequency and impact that the particles to each other and their container. Gases have lower densities because the particles are more spaced out then in a liquid or solid. Gas particle also like to travel from areas of high concentration to areas of low concentration. This is because the particles flow freely with out attracting or repelling each other. The can move pass each other easily to spread out.The particles can easily compress and expand because there is a lot of space between gas particles unlike the particles in water or a solid.

HUMAN DENSITY DUNK

One day in chemistry Mrs. Lee asked do you think we could take the mass of a Human. The class answered yes. So Friday in class we did a human density dunk. Before we actually did the experiment we started planning the week before. The supplies we need where a kiddy pool, a big garbage can, containers to collect the water, beakers, paper and pencil, and a shower curtain. We had everybody signed a paper saying the job they would be responsible for . We also came to the conclusion that we would have to transfer pounds to grams and that we would have to take the volume and mass of the garbage can filled with water to subtract from the water that came out. The jobs where: Recorders, Dunkies, Helpers, Collectors, Media, Set up, and Clean up. The recorders where the people that wrote down all the information and transferred pounds into grams (g). Dunkies where the people that actually got into the water. Helpers helped the dunkies into the pool so they wouldn't get hurt. Collectors collected the water that feel out of the garbage can when the dunkie got in so we could find the volume. Media where the people that took pictures and video of the experiment. Set-up where the people that got the kiddie pool set up and the garbage can filled with water. Clean-up was of course the people that clean up after the experiment. we did a boy and a girl from each of the 3 hour chemistry classes so when we plotted the data we had 6 points. Of course the boys had a higher density, but the thing we found to be strange was that the density of a human was close to the density of water. We came to the conclusion that the density of a human is so close to water because we're made of mostly water.http://wiki.answers.com/Q/What_is_the_average_density_of_the_human_body This is a website that explains more about how a humans density is close to water.