Gases

At a constant pressure, the volume decreases.  What happens to the temperature?

• increases
• decreases
• stays the same

Tags

NGSS.MS-PS1-4

At a constant volume, the pressure increases.  What happens to the temperature?

• increases
• decreases
• stays the same

At a constant temperature, the volume decreases.  What happens to the pressure?

• increases
• decreases
• stays the same

A 2.00 L sample of pure oxygen gas (O₂) is measured at STP.  How many moles of oxygen is this?

• 24.4 mol
• 0.007 mol
• 1.44 mol
• 0.09 mol

Tags

NGSS.HS-PS1-7

A 7.00 L sample of argon gas at 420. K exerts a pressure of 625 kPa.  If the gas is compressed to 1.25 L and the temperature is lowered to 350 K, what will be its new pressure in atm?

• 10.4 atm
• 2920 atm
• 2916.7 atm
• 28.8 atm

How many grams of N₂O₅ gas  are in a sample that has a volume of 2.00 Liters at 298 K and 100. kPa of pressure.  

• 8.72 grams
• 0.0807 grams
• 12.3 grams
• 883 grams

Calculate the volume that a 0.323-mol sample of a gas will occupy at -8^oC and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

The volume of a gas is increased from 150.0 mL to 350.0 mL by heating it. If the original temperature of the gas was 25^oC, what will its final temperature be (in ^oC)

• 146 ^oC
• 10.7 ^oC
• 58.3 ^oC
• 422 ^oC

Tags

NGSS.HS-PS3-4

How many grams of potassium chlorate are needed to form
3.45 liters of oxygen gas at STP?
2KClO_3 (s) --> 2KCl _(s) + 3O_2 (g) 

• 113 g
• 0.631 g
• 12.6 g
• 28.3 g

Tags

NGSS.HS-PS1-7

At STP (Standard Temperature and Pressure), a gas has a volume of
3.0 L. What is the new volume if the pressure increases to 303.9 kPa? 

• 9.0 L
• 1.0 L
• 9.0 kPa
• 1.0 kPa