Semester 2 Review: Gases, solutions, samplet

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

• increases
• decreases
• stays the same

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 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

What is zero degrees Celsius converted to Kelvin?

• 100

• 273

• 373

• 212

The volume of a gas is increased from 150.0 mL to 350.0 mL when heated. If the original temperature of the gas was 25^oC, what is the final temperature?

• 58 K

• 176 K

• 128 K

• 695 K

A sample of Argon gas occupies a volume of 1.8 L at 2.8 atm. What will its volume be at 1.2 atm?

• .77 L

• 1.87 L

• 3.0 L

• 4.2 L

An unsaturated solution is one that....

• contains the maximum amount of dissolved solute.
• contains less solute than a saturated solution.
• contains more solute than a saturated solution.
• is the amount of a substance required to form a saturated solution.

What is the molarity of a 2 liter solution containing 5 moles of NaCl?

• 2.5
• 0.4
• 2.5 moles/liter
• 10 moles/liter

Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?

• strongly acidic

• slightly acidic

• strongly basic

• slightly basic

The formula M₁V₁ = M₂V₂ is used when:

• dissolving a solute in a solvent

• diluting a solution

• reacting an acid with a base

• determining the pH of an acid