Chapter 14.1 #1 Key Concept: Why is a gas easy to compress? http://www.chemistry.ohio-state.edu/betha/nealGasLaw/fr2.2.html Gases are easily compressed because there is so much space between the molecules of gas. #2 Key Concept: List three factors that can effect gas pressure. 1. number of molecules of gas 2. temperature 3. volume See the animation on the last question. #3 Why does a collision with an air bag cause less damage than a collision with a steering wheel. An air bag is filled with gas which is compressible. It allows the body to compress gases instead of hitting a solid wheel. The gases absorb the momentum of the body in a soft gradual fashion instead of an abrupt, brutal way. #4 How does a decrease in temperature affect the pressure of a contained gas? See the animation on question #1 As the temperature of a gas goes up in a closed container, the pressure also goes up. As the temperature goes down, the pressure goes down too. http://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/gam2s2_6.swf #5 If the temperature is constant, what change in volume would cause the pressure of an enclosed gas to be reduced to one quarter of its original value? The volume and the pressure change in an INVERSE relationship. As one gets bigger the other gets smaller: To reduce the pressure of a gas by 4 times you need to increase the volume by 4 times. http://wps.prenhall.com/wps/media/objects/439/449969/Media_Portfolio/Chapter_12/P-V_R #6 Assuming the gas in a container remains at a constant temperature, how could you increase the gas pressure in the container a hundredfold? DECREASE the volume by 100 times.