Blog activity 7

1. Complete the Clicker Questions on Gas Laws in the Teaching Idea "Concept Questions" for Chemistry using PhET" posted by Trisch 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. Greater- Air molecules are about 150 times the size of helium molecules. They are more dense, creating more pressure than the helium molecules. 

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. The helium molecules are smaller and less dense than those of air molecules. Therefore there is less pressure in the helium balloon. 

3.       How does 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. As stated before, air molecules are about 150 times the size of helium molecules. That being said, it takes less air molecules to fill up the space than it does helium molecules. 

4.       How does the average speed of Helium molecules compare to that of the air molecules? The average speed of the He molecules is: C. greater. Helium molecules are smaller than air molecules, making them able to move quicker. 

5.       What will happen to the pressure if temp is held constant and the volume decreased? B. Pressure goes up because there are more collisions happening, but the same force per collision. When the volume decreased, it caused the pressure to increase. 

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. has stayed the same. The bottle was sealed and didn't let any other air molecules in or out of it. Therefore, the number stayed the same. 

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 shampoo bottle is sealed containing air from Denver. No air molecules are entering nor leaving the bottle. Therefore, the air pressure in the bottle will remain the same as Denver's. 

8.       How does the pressure inside the bottle compare to the pressure of the air in Boston? A. Less than. The air pressure in the bottle is less than the air pressure in Boston because Denver's altitude is higher than Bostons. 

9.       If you had a water bottle with very soft sides. When you open your suitcase in Boston, the bottle would look: A. Squished. This is because the air pressure in the bottle is less than the air pressure in Boston.