Activity 7

Activity 7

 

Review the Content on Gases on the D2L site, and the chapter on Gas Laws in the Hill textbook.

 

Complete the Clicker Questions on Gas Saws in the Teaching idea “Concept Questions for Chemistry using PhET” posted by Trish Loeblein.  Use the PhET simulation Gas Properties to help answer the questions.  On your blog post the answers with your scientific explanations to these questions.   

 

1.       There are 2 balloons in a room.  They are identical in size and material.  One balloon is filled with air and the other balloon is filled with Helium.  How does the pressure of the air balloon compare to the pressure of the Helium balloon.  The pressure in the air balloon is:

                C, the air is more dense than the helium

2.       How does the pressure in the Helium balloon compare to the pressure of the air in the room?  The pressure in the Helium balloon is.

                A, less because it contains less pressure than the air.

3.       How do the number of air molecules in the air balloon compare to the number of He atoms in Helium balloon?  The number of air molecules is:

A, less air molecules take up more space because of air molecules being larger than the helium molecules. 

4.       How does the average speed of the Helium molecules compare to that of air molecules?  The average speed of the He molecules is:

C, greater because the air molecules are small they are able to move faster.

5.       What will happen to the pressure if temp is held constant and the volume is decreased?

B, the pressure will go up because more collisions are occurring but the same force collision. 

6.       You are flying from Denver to Boston, and you bring along a ½ full bottle of shampoo that was well sealed before you left Denver.  You land in Boston and proceed to your hotel.  The number of air molecules within the shampoo bottle:

B, are the same because the bottle didn’t change pressure.

7.       If the walls of the shampoo bottle are strong and rigid so that the bottle has the same shape as before you left, how does the pressure of the air inside the bottle compare to the pressure of the air in Denver?

B, equal to the pressure of the air in the bottle and the same as the air pressure in Denver.

8.       How does the pressure inside the bottle compare to the pressure of the air in Boston?

A,  less than because the pressure in Denver is lower than the air pressure in Boston because of Denver’s high altitude. 

9.       If you had a water bottle with very soft sides.  When you open your suitcase in Boston, the bottle would look:

A, Squished, the pressure of the air is much greater in Boston than the pressure inside the bottle.