Unit 4 Test Review

Using the Gas Laws

100

Constant Volume: A gas with the starting conditions of 2.4 atm and 100°C  and the ending pressure of 4.5 atm, has what final temperature?

699.38 K or 426.38°C

200

Constant Temperature: A gas with the starting conditions of 2.4 atm and 5 L  and the ending pressure of 3.8 atm, has been condensed to what volume?

3.16 L

300

A gas with the starting conditions of 2.4 atm, 5 L and 100°C requires what pressure to be condensed to 3.1 L at 150°C?

P= 4.39 atm

400

5.4 atm of pressure is exerted on 4.3 moles of Carbon dioxide in a 800 mL tank. What temperature is the gas at?

12.24 K

500

At a constant temperature, if pressure increases what happens to the volume of the gas.

it decreases

The Ideal Gas Law

100

When finding Volume in PV=nRT, volume is always measured in ____.

Liters

200

When using the ideal gas formula PV=nRT, if P is in atm, R=____.

0.0821 L atm/mol K

300

How much pressure is required to condense 1.2 moles of a gas into 17 L at 301 K?

1.74 atm

400

The ideal gas law relates ____,____, and _____.

Pressure, Temperature, and Volume

500

What are the unit requirements when using the Ideal Gas Law? List them all (for P, T and V)

P= atm

T= K

V= L 

Molarity & Dilutions

100

What is the molarity of a solution that contains 3.5 moles of NaCl within 25,000 mL?

0.14 M

200

What is the molarity of a solution containing 15 grams of NaCl in 25,000 mL?

M= 0.01 M

300

When you dilute a solution of 1.3 M in 4 L into 6L, what is the new molarity?

M₂= 0.87 M

400

When you dilute a solution of 10 M in 50 mL into 1 L, what is the new molarity?

M₂= 0.5 M

500

Molarity is a unit of .....?

Concentration

Conversion Problems

100

How many atm are in 988 torr?

1.3 atm

200

Convert -237 degrees Celsius to K

36 K

300

250 mL to L

0.25 L

400

number of moles equivalent to 413.5 grams of CaCl₂

3.73 moles 

500

Convert the one variable that needs to be converted in the following problem: "There's 1.3 moles and 5 L of N₂ gas at 940 torr. What's the temperature?"

940 torr= 1.24 atm **must use atm in the ideal gas law**

Reaction Rates

100

This term describes the minimum amount of energy required for a successful collision to result in a reaction.

Activation Energy

200

Increasing this measurement for a solid reactant, such as by grinding it into a powder, increases the number of particles available to react.

Surface Area

300

This "T-word" measures the average kinetic energy of particles; increasing it makes collisions both more frequent and more energetic

Temperature

400

List 3 things that increase the reaction rate of a reaction.

Surface area, temperature and concentration

500

What does not change when diluting a solution?

Moles of solute.