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Phase Change
My report on "Phase change"
Student name:
Teacher name:
Page 1 : http://mw2.concord.org/public/part2/phasechange/page1.cml
1. List three more everyday examples of phase change.
Condinsation forming around a glass of cold water,
water vapor forming from boiling water,
and water freezing into ice, in a freezer. (7:02:52 PM)
Page 2 : http://mw2.concord.org/public/part2/phasechange/page2.cml
1. Describe the motion of atoms and molecules in a gas.
Fast moving, colliding with the walls of container and other atoms. Projectory is somewhat altered by attraction of atoms. (7:09:37 PM)
2. How are the behavior and arrangements of gas molecules similar to and different from soccer players running in the field?
they are both contained in a container", which they are able to freely move around in colliding with one another and thier bounderies. (7:11:40 PM)
Page 3 : http://mw2.concord.org/public/part2/phasechange/page3.cml
1. Record the average number of dashed lines there are per atom of each liquid.
liquid 1 = 20600
liquid 2 = 5175
not sure if this is right? (7:18:31 PM)
2. Observe the motion of the atom or molecule that were randomly selected. Describe the movement of that atom/molecule compared to the atoms around it.
the movements of each individual atom are not much different to that of each other. The motion of a single atom form one spot to another is reletively slow. (7:21:05 PM)
3. How far do the atoms in a liquid appear to travel? Press the "Randomly pick an atom and show its trajectory" button, take a snapshot and place a snapshot image that you think best answers this question in the box below.
The motion of this liquid does not move from place to place rapidly either. (7:25:03 PM)
4. How does the motion of folks at an outdoor rally resemble a liquid?
They are placed in a "container" and collide with one another and do not move regularly or rapidly. (7:26:00 PM)
Page 4 : http://mw2.concord.org/public/part2/phasechange/page4.cml
1. Stop the model and estimate how many dashed lines there are on the average for individual atoms inside the solid (not on the edge). Write down the number for each model below.
solid 1 = 4
sloid 2 = 6 (7:29:24 PM)
2. How would you describe the movement and arrangement of atoms and molecules in a solid?
hardly moving, little motion, and do not move from place to place. (7:45:33 PM)
3. Molecules of gas are so far apart that the intermolecular attractions are pretty insignificant on the random thermal motion of the gas particles. Describe the role of intermolecular forces for solids and liquids.
they are definetly more significant, they are much stonger forces. (7:48:23 PM)
4. How does the motion of atoms and molecules in a solid resemble people in a movie theater?
The people, like the atoms of a solid, hardly move. Barely shilft positions. (7:49:25 PM)
Page 5 : http://mw2.concord.org/public/part2/phasechange/page5.cml
1. Based on what you observed in the model, choose the items in the list below that you think have weak forces between atoms. Assume all these items are at 300K.
(a) Water
(b) Wood
(c) Iron
(d) Air
(e) Gold
(f) Mercury
(g) Carbon dioxide
(h) Oxygen
(i) Gasoline
(j) Lead
My answer is (d) (g) (h) (7:51:04 PM)
2. Based on what you observed in the model above, choose the items in the list below that you think have strong forces between atoms. Assume all these items are at 300K.
(a) Water
(b) Wood
(c) Iron
(d) Air
(e) Gold
(f) Mercury
(g) Carbon dioxide
(h) Oxygen
(i) Gasoline
(j) Lead
My answer is (b) (c) (e) (j) (7:51:41 PM)
Page 6 : http://mw2.concord.org/public/part2/phasechange/page6.cml
1. What do you think caused the temperature of the larger atoms that are originally in the right part of the model to rise?
they had contact with atoms which had a high amount of kinetic energy. (7:58:21 PM)
2. Place here a snapshot of model after the wall has been withdrawn that shows the larger atoms are in liquid state.
(8:00:02 PM)
Page 7 : http://mw2.concord.org/public/part2/phasechange/page7.cml
1. Please fill in the snapshot of the line graph you have taken after the simulation stops:
(8:02:36 PM)
2. Describe what was happening in the model when the temperature stopped rising (in the middle of the simulation). Describe the state of the molecules throughout this time .
the atoms had begun to go through a state phase, from a solid to a liquid, then eventually a gas. (8:06:17 PM)
Page 8 : http://mw2.concord.org/public/part2/phasechange/page8.cml
1. What do you think caused the system to cool down when evaporation happens in the second model, based on the reasoning from the first model?
the atoms with the most kentic energy producing the most heat were able to escape and the remaining atoms were relieved of that kinetic energy and heat, causing the tempurature to decrease. (8:14:47 PM)
Page 9 : http://mw2.concord.org/public/part2/phasechange/page9.cml
1. Fill in a snapshot image of the xenon when it is in a solid state.
Solid
(8:19:00 PM)
2. Fill in a snapshot image of the xenon when it is in a liquid state.
Liquid
(8:19:08 PM)
3. Fill in a snapshot image of the xenon when it is in a gaseous state.
Gas (8:19:12 PM)
4. When water cools from 2℃ to –2℃, what happens to the motion of the molecules?
(a) The molecules stop moving.
(b) The molecules remain moving just the same.
(c) The molecules move less freely.
(d) The molecules move more freely.
My answer is (c) (8:19:53 PM)
5. Suppose you are small enough to sit on a molecule. Describe what you see if you were sitting on a molecule in a gas, and that gas turned into a liquid.
i would see less motion, as well as much more atoms being able to come closer to that atom i was sitting on (8:21:15 PM)
6. On a microscopic scale atoms look just about as crowded in a liquid as in a solid. What are some molecular level ways you can think of to decide whether a substance is a solid or a liquid.
Yo offer the substance more room in its container, if the atoms were to move then they would be liquid, if they were not to move, then they would be solid. (8:23:13 PM)
7. When you get out of the water after swimming, you often feel cold as water evaporates off of your skin. That means you must be losing heat energy. As the water evaporates, it is changing from a liquid to a gas. Explain why the process of evaporation should use up heat from your skin.
because the heat of molocules always moves in this manner. (8:25:46 PM)
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