Adv Chem Unit 09 Mock Exam

At standard temperature, a gas has a volume of 332 mL. The temperature is then increased to 128°C, and the pressure is held constant. What is the new volume?

• Unable to determine without initial temperature. 
• 226mL
• 488mL
• 708mL

A vessel at 987 mmHg contains nitrogen, argon, helium, and carbon dioxide gases. The partial pressure of the first three gases are 44.0 mmHg, 466 mmHg, and 220 mmHg respectively.  What is the partial pressure of carbon dioxide in atm?

• 1.30 atm
• 2.00 atm
• 0.338 atm
• 0.961 atm

Identify the correct statement regarding the Kinetic Molecular Theory. 

• As temperature decreases, this causes velocity to decrease.
• Gas particles are closely associated with each other.
• Intermolecular forces are strong.
• Collisions are effective (inelastic).

Consider the mixture of gases pictured.  
Which of the gases move at a slower average velocity?

• Helium because it has a smaller molar mass. 
• Neon because it has a larger molar mass. 
• The both move at the same average velocity because they are at the same temperature. 

• It is impossible to tell without knowing the number of moles of each gas.

Tags

NGSS.HS-PS3-2

A gas has a pressure of 2.26 atm and occupies a volume of 4.40 L. If the gas is compressed to a volume of 2.68 L, what will its pressure be, assuming constant temperature? 

• 3.71atm
• 1.38atm 
• 5.22atm
• 2.68atm

The following plot is for an ideal gas. Consider the ideal gas equation, PV=nRT, and identify what state function(s) could be represented by x for this plot.

• P, T, or n
• P, or T
• P, or n
• T, or n

The same number of moles of NH₃ and O₂ are placed in separate flasks of equal volume and temperature under conditions when both gases behave ideally. Which statement is true?

• Both bulbs contain the same mass of gas.

• The pressure in each bulb is the same.

• The bulb containing O₂ contains more molecules of gas.

• The bulb containing NH₃ contains more molecules of gas.

For the reaction
2 HCl(g) + Na₂CO₃(s) → 2 NaCl(s) + H₂O(l) + CO₂(g) 

179.2 liters of CO₂ is collected at STP. How many grams of NaCl are also formed?

• 935.1g
• 467.5g
• 179.2g
• 22.4g

Tags

NGSS.HS-PS1-7

Find the number of moles of ammonia, NH₃, produced from a reaction of 4 moles of nitrogen gas at STP with excess hydrogen gas.

N₂(g) + 3H₂(g) → 2NH₃(g)

• 2 mol

• 8 mol

• 4 mol

• 1 mol

Use the ideal gas law to calculate the volume occupied by 5.6g of nitrogen gas at 1.00 atm pressure and at 27◦C.

• 4.9 L
• 0.44 L
• 22.4 L
• 0.0821 L