On a cold day near the ocean, it was found that 8g of an unknown gas occupies a volume that is little less than 6L. based on this information, which if the most likely identity of the unknown gas?

• CO₂

• Ne

• O₂

• CH₄

Which of the following gases is expected to behave most ideally at a given temperature and pressure?

• H₂O

• NH₃

• Xe

• He

An experiment is performed to measure the pressure of chlorine gas with in a 2.00L container at 273K. The student calculates the pressure using the ideal gas law to be 67.2atm. They calculated the pressure again using the van der Waals equation for real gases to be 22.5atm. What is the major factor that accounts for the difference between these two values?

• Chlorine is a halogen

• Diatomic nature of chlorine

• Volume of the chlorine particles

• Forces of attraction between chlorine molecules

A sample of gas is heated from 35^oC to 70^oC. Which statement correctly describes what happens to the volume?

• The volume increases by a factor of less than 2

• The volume increases by a factor of 2

• The volume decreases by a factor of less than 2

• The volume decreases by a factor of 2

Tags

NGSS.HS-PS1-5

What is the total pressure produced in this explosion?

• 25.0atm

• 52.0atm

• 179atm

• 435atm

In a second experiment, the total pressure is observed to be 58atm. What is the partial pressure of the water vapor produced?

• 10atm

• 20atm

• 30atm

• 40atm

The Maxwell-Boltzman distribution for unknown gas is shown. At which point on the graph is the average temperature of the gas most directly related to its molecular speed?

• A

• B

• C

• D

Two gases are removed from their original containers and placed into a third container, where they react with each other. All three containers have identical volumes, and all gases are at the same temperature. Which container has the lowest pressure?

• Container A before the reaction

• Container B before the reaction

• Container C after the reaction

• they all have the same pressure

A sample of neon gas is contained in the left bulb and helium in the right bulb, connected by a valve. Initially the valve is closed. The left bulb has a volume of 9.00L, and the Ne gas is at a pressure of 2.00atm. The right bulb has a volume of 3.00L, and the He gas is at a pressure of 4.00atm. After the valve is opened, what is true about the relative partial pressures of helium and neon?

• The partial pressure of helium is 1.50 times as great as the partial pressure of neon.

• The partial pressure of neon is 2.00 times as great as the partial pressure of helium.

• The partial pressure of neon is 1.50 times as great as the partial pressure of helium.

• The partial pressure of helium is 2.00 times as great as the partial pressure of neon.

Which of the following is a reasonable estimate for the volume of a balloon that has been filled with 300g of oxygen gas at STP?

• 1 L

• 10 L

• 50 L

• 200 L