# Gas and Atoms

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• Published : February 21, 2012

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Page 1 : E:\CC_Software\Workbench\CC-MW-CD\part2\phasechange\page1.cml

1. List three more everyday examples of phase change.

-snow melting and freezing into ice
-fuel being changed into gas for cars
-ponds freezing over to have a layer of ice

Page 2 : E:\CC_Software\Workbench\CC-MW-CD\part2\phasechange\page2.cml

1. Describe the motion of atoms and molecules in a gas.

the atoms and molecules bounce off one another each time they come in contact with eachother. they never bond, but reflect off of eachother and spread around.

2. How are the behavior and arrangements of gas molecules similar to and different from soccer players running in the field?

the molecules are similar to soccer players running on a field when they continually move and dont stop. players in soccer never stop moving during the game, and the gas molecules dont stop moving and keep bouncing off one another.

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1. Record the average number of dashed lines there are per atom of each liquid.

the average number of dashed lines are 3-4 per atom

2. Describe the motion of atoms and molecules in a liquid.

the atoms are tight and compact, they bounce off of each other. they generally dont leave a certain section of the liquid, and stay in the same area.

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.

4. How does the motion of folks at a festival resemble a liquid?

all the folks move their arms and themselves in a very concentrated manner and stay generally in the same spot. they bounce up and down, just like how the aroms and molecules move up and down.

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1. Stop the model and estimate how many dashed lines there are for atoms inside the solid. Write down the number for each model below.

there appears to be approximately 20-25 dashed lines inbetween the atoms.

2. Estimate how many dashed lines there are for atoms at the edges. Compare the numbers with those in the previous question, and write down what you think.

there appears to be approximately 7 dashed lines on the edge of the atoms. the dashed lines are different because there are a different number of atoms inside the edges with dashed lines than the outside where there are a lower amount of atoms.

3. How would you describe the movement and arrangement of atoms and molecules in a solid?

very compact and still. there is not very much movement, because the atoms are very compact and dont have much room to move.

4. How does the motion of atoms and molecules in a solid resemble people in a movie theater?

people in the movie theater and the atoms/molecules are similar because there isnt much movement. the people in the movie are intent on watching the movie so there isnt much movement, just like the atoms in the example.

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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

My answer is (d) (g) (h)

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