Sunday July 10, 2022

May 12, 2017

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Gas Laws Quiz Preview
The Gas Laws quiz will be multiple-choice questions based on the questions in this list. Fill in this page and then take the quiz. Be sure to find the correct answer from the choices on the quiz and remember that rounding numbers may cause some to be off just a little. If you see an answer which is off by a few tenths, count it as being right.
2013-2014 SM2
Make sure you know the formulas for the gas laws:

1. (Hint â€“ a T or F question about which temperature scale to use on gas law problems.)
2. Convert 71 Â°C to Kelvin. __?__
3. Atmospheric pressure is the result of the weight of gas particles above you. How does this pressure change as you drive from a valley to the top of a tall mountain? __?__. (increases, decreases, stays the same or varies with each gas)
4. One of these units is NOT used to measure pressure, which one? (atmospheres, kelvins, torrs, kilopascals)
5. The variable which Boyleâ€™s Law holds constant is __?__. (temperature, pressure, volume, number of moles)
6. The variable that Charles held constant in the gas law that has his name was the __?__. (temperature, pressure, volume, number of moles)
7. Increasing the temperature of a balloon will have which effect on the balloonâ€™s volume? __?__. (increases, decreases, stays the same or varies randomly)

8. A sample of gas is in a cylinder which has a volume of 1.5 L. If the cylinder is allowed to expand to 2.0 L, what will happen to the pressure of the gas? (increases, decreases, stays the same or cannot be determined)

9. Use Boyleâ€™s law to solve this problem. A balloon occupies a volume of 0.93 liters at a pressure of 84.5 kPa. When the balloon is allowed to expand so that it occupies one full liter (the temperature is held constant), what is the pressure of the air inside of the balloon? __?__.

10. A cylinder of compressed gas occupies a volume of 0.54 liters and is under a pressure of 104 kPa. If the gas were released into a balloon at a pressure of 72 kPa, what would be the new volume of the balloon? __?__.
11. If Charles had 4.0 liters of hydrogen gas at 30 Â°C, how cool would it have to get to have a new volume of 2.8 liters? (be sure to give the answer in kevins). __?__. (Did you change the Celsius temperature to Kelvin? Gas law problems require that you use Kelvin temperatures.)
12. STP stands for standard temperature and pressure and is used in Gas Law problems. Standard temperature is 5 K and standard pressure is 1.00 atm. (True or False)
13. A ball at a temperature of 37.0 Â°C has a volume of 11.0 liters and a pressure of 1.60 atmospheres. What would be the resulting volume if the pressure is reduced to 1.00 atmosphere and the temperature lowered to 25.0 Â°C ? __?__. (Be careful with the temperatures â€“ did you convert them to K?)
14. A ball has a volume of 9.0 liters and is subjected to a pressure of 3.5 atmospheres when its temperature is 74 Â°C. According to the ideal gas law, how many moles of gas are in the ball? (Hint: for this problem, use the value of R = 0.08206 Lâ€¢atm/molâ€¢K.) __?__. (Again, convert to Kelvin temperature.)
15. According to what you have studied about gases, what happens at absolute zero (0 K) ? __?__.

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