Activity 7 A Gaseous Outlook answer key

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Activity 7 A Gaseous Outlook answer key

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A.In the jet-propelled balloon activity,
the compressed gases inside the balloon is suddenly released. It is expected
that the balloon will suddenly shoot up. The higher the compression, the higher
is the amount of kinetic energy, the faster is the speed of the balloon.

 

Answers:

1. The compressed gases have high kinetic energy that allows the balloon
to move. There are molecules of gases that push the walls of the balloon and
there are gases that push the air near the opening of the balloon. The balloon
moves toward the direction of the gases with the greater force.

 

2.  The lower
the compression, the higher is the amount of kinetic energy, the faster is the
speed.

 

B. In the rising
water
activity,
the glass will be carefully placed upside down inside the bowl with water. It
is expected that the water level outside the glass will increase. Why? There
are gases inside the glass that have volume that adds to the volume of the
water, hence the level of the water increases.


Answers:

1.  The water did not enter the
glass.

2.  The spaces between the
water molecules at the bottom of the basin are not enough to accommodate the
molecules of gases inside the glass.

3.  If the glass is raised without leaving
the water, or if the glass is totally removed from the water, the volume of the
gas is also reduced causing a decrease in the level of the water.

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