Quarter 3 Review

Density/Rain Gauges

100

What is the definition of density?

The degree of compactness of a substance

200

A material has a mass of 50g and a volume of 85mL. What is the density of the material? (D=M/V)

0.588 g/mL

300

A material has a density of 1.5 g/mL. If a sample of this material has a mass of 35g, what is its volume? (D=M/V)

23.3 mL

400

A rain gauge has a volume of 600 mL, and a height of 30 cm. What is its base size? (V=K*H)

20 cm²

500

A material has a density of 1.60 g/mL as a solid and 0.00075 g/mL as a gas. If you start with 150 mL of the material as a solid, what will its volume be as a gas?

Find solid volume:

M/V=D -> M/150=1.60 ->M=240g

M_Solid=M_Gas 240g=240g

Find gas volume:

240/V=0.00075 -> 240=0.00075*V -> 240/0.00075=320,000 mL

Conceptual Questions

100

As temperature increasing, volume ____________

Increases

200

As pressure increases, volume ___________

Decreases

300

As temperature decreases, the pressure ___________

Decreases

400

The amount of kinetic energy in a materials particles is measured using ____________

Temperature

500

The average number of collisions with the sides of a container is measured using _________________

Pressure

Conversions

100

Convert 2 atm to Torr

(1 atm = 101,325 Pa = 760 Torr = 760 mmHg)

2 atm x (760 Torr/1 atm) = 1520 Torr

200

Convert 2500 Torr to Pascals

(1 atm = 101,325 Pa = 760 Torr = 760 mmHg)

2500 Torr x (101,325 Pa/760 Torr) = 333,305 Torr

300

Convert 500,000 Pa to Torr

(1 atm = 101,325 Pa = 760 Torr = 760 mmHg)

500,000 Pa x (760 Torr/101,325 Pa) = 3750 Torr

400

Convert 4 moles to particles

(1 mole = 6.02x10²³)

4 mole x (6.02x10²³ Particles/1 Mole)= 2.4088566x10²⁴ Particles

500

Convert 4.215x10²⁴ to moles

(1 mole = 6.02x10²³)

4.215x10²⁴ x (1 Mole/6.02x10²³ Particles)= 7 Moles

Base Gas Laws

100

A balloon has a volume of 2L at a temperature of 300K. What is the new volume at 400K?

2.6 L

200

The pressure in a container is 3.5 atm at a temperature of 500K. What is the new pressure when the temperature increases to 750K?

5.25 atm

300

A piston in an engine exerts a pressure of 10 atm to decrease the cylinder to 1.4 L. What is the pressure of the cylinder when the volume is 3L?

4.6 atm

400

A rigid container has a volume of 500mL. Inside, it is at a pressure of 0.8 atm and a temperature of 293K. What is the pressure of the container when moved into an area with temperature of 450K?

1.22 atm

500

A balloon with a max size of 12L is inflated with helium to 5L, with a pressure of 0.95 atm. If the balloon is released into the atmosphere where the pressure decreases to 0.45 atm. What is the balloons new volume, and will it pop or not?

10.5 L and no it will not pop

Combined Gas Laws

100

What are the standard units for an STP of gas?

1 mole, 1 atm, 273K, 22.4L

200

A tire is filled to a volume of 10 L at 300 K, maintaining a pressure of 2.8 atm. During the winter the temperature drops to 260 K decreasing the pressure to 2.6 atm. What is the new volume of the tire?

9.33 L

300

A pool floaty contains 20L of gas at a pressure of 0.9 atm, on a hot day of 300K. If the pressure stays the same, what must the temperature be to increase the volume of the floaty to 22? 

330 K

400

How many moles of gas are there if a container has a pressure of 5 atm, a volume of 15 L, and is at a temperature of 325K?

2.8 moles

500

What is the pressure of a gas with 15 moles, being held at a volume of 8 L at 450K?

69.2 atm