Honors Choice Board: Gas Laws

1. Kinetic Molecular Theory Read the following statements about the Kinetic Molecular Theory and determine if each statement is true or false. True The size of gas molecules are small compared to the average distance between them Elastic collisions mean that no kinetic energy is lost The average kinetic energy is proportional to the overall temperature Pressure of a gas is caused by collisions False Gas molecules move in waves Gas molecules move in a predicted pattern Gas molecules have a strong attraction for each other More collisions means less pressure Higher temperature means less kinetic energy of the gas molecules 2. Which of the following will increase pressure? decreasing volume, temperature remains constant increasing volume, temperature remains constant decreasing temperature, volume remains constant increasing temperature, volume remains constant decreasing number of moles (gas particles) increasing number of moles (gas particles) 3. Direct or Inverse? Sort the following as having a direct relationship or an inverse relationship. Direct temperature and pressure volume and temperature number of molecules and pressure Inverse pressure and volume 4. Units Match the units to the correct variables. Pressure atm mm Hg kPa torr Volume L cm3 Temperature K 5. What is considered to be standard temperature? 0 K 273 K 0°C 273°C 6. What is considered to be standard pressure? 1 atm 101.3 kPa 760 mm Hg 7. Calculations A 300. mL sealed spray can containing insect spray is kept outside at a temperature of 15°C . It is accidentally dropped into a campfire, causing the temperature inside the can to quickly rise to 99°C. Calculate the new volume of the gas inside the can. 8. Calculations In a commercial airliner, an empty water bottle contains about 500. mL of air. The air pressure at that altitude is 0.74 atm. What will the volume of the water bottle be after landing and reaching an air pressure of standard atmospheric pressure? 9. Calculations Be sure to include the correct unit with your answer. The pressure of a gas changes from 120 kPa to 50 kPa. The volume changes from 45 L to 40 L. If the initial temperature is 81°C, what is the final temperature? 131 K If 0.37 grams of nitrogen (N2) is at a temperature of 300 K and are under 154.2 kPa of pressure, what volume does the sample occupy? 0.21 L What is the pressure (in atm) of oxygen gas at 37˚C with a density of 3.58 g 2.85 atm A mixture of gases with a pressure of 500 mmHg contains 60% nitrogen and40% oxygen by volume. What is the partial pressure of oxygen in this mixture? 200 mmHg Two flasks are connected with a stopcock. Flask #1 has a volume of 2.5 L and contains oxygen gas at a pressure of 0.70 atm. Flask #2 has a volume of 3.8 L and contains hydrogen gas at a pressure of 1.25 atm. When the stopcock between the two flasks is opened and the gases are allowed to mix, what will the resulting pressure of the gas mixture be? 1.0 atm 10. Show Your Work A gas consisting of only carbon and hydrogen has an empirical formula of CH2. The gas has a density of 1.65 g at 27˚C and 97.9 kPa. Determine the molar mass and molecular formula of the gas. 11. Show Your Work A gas contains a mixture of neon and argon gas. The mole fraction of neon is 0.43 and has a partial pressure of 2.0 atm. What is the total pressure in the container and the partial pressure of argon? 12. Calculations How many molecules of sulfur trioxide are there in 42.5 L of SO3 gas at STP?Show your work using the fence. Don't forget units. 42.5 L SO3 1 mole SO3 6.02x1023 molecules SO3 1.14x1024 molecules SO3 leave blank 22.4 L SO3 1 mole SO3 leave blank