Gases

Question 1

Pressure

Answer 1

the normal force applied to a unit area of a surface

Question 2

Temperature

Answer 2

measures average kinetic energy

Question 3

Volume

Answer 3

the amount of space something takes up

Question 4

Charles Law

Temp vs Volume

Answer 4

• As temp increases, volume increases

- Direct relationship

Question 5

Gay Lussac’s Law

Temp vs Pressure

Answer 5

• As temp increases, pressure increases

- Direct relationship

Question 6

Boyle’s Law

Pressure vs Volume

Answer 6

• As pressure increases, volume decreases

- Indirect relationship

Question 7

Gases of the same volume have:

Answer 7

the same number of molecules

Question 8

Combined Gas Law Equation

Answer 8

P1 V1 P2 V2
——– = ———-
T1 T2

Question 9

What are things that you need to remember for using combined gas law?

Answer 9

• Cross out all values that are held constant
• Always put temp in KELVIN
• STP is on Table A

Question 10

400mL of gas, at constant Pressure, is at 50°C. What will be the new volume at 300°C?

Answer 10

2400 mL

Question 11

Kinetic Molecular Theory

Answer 11

Used to explain the behavior of gases

Shows relationships between pressure, volume, and temperature on gases

Question 12

Part 1 of KMT

Answer 12

Gas particles are in constant, random, straight-line motion and only change direction when they collide

Question 13

Part 2 of KMT

Answer 13

When particles collide with one, another energy is transferred (not lost) from one particle to another

Question 14

Part 3 of KMT

Answer 14

Particles are so small that their volumes are considered to be zero (negligible)

Question 15

Part 4 of KMT

Answer 15

Gas particles have no attractive forces for one another!

Question 16

Ideal Gases

Answer 16

• Particles have no Volume
• No attractions or repulsions
• Collide without loss of energy

Question 17

Real Gases

Answer 17

• Have volume
• Have attraction b/w particles
• Some energy can be transferred to surroundings

Question 18

How can real gases behave most like ideal gases?

Answer 18

• High Temperature

- Low Pressure

Question 19

Which elements are most like ideal gases?

Answer 19

Hydrogen and Helium are most like ideal gases because they are SMALL!!!

Question 20

What is vapor pressure?

Answer 20

The pressure the liquid exerts on the side of the container it is in. When the vapor pressure reaches atmospheric pressure, the liquid boils

Question 21

The lowest vapor pressure has

Answer 21

• The highest BP

- Strongest intermolecular forces

Question 22

High vapor pressure has

Answer 22

• Lowest BP

- Weakest intermolecular forces

Question 23

Avogadro’s Hypothesis

Answer 23

equal volumes of gases have the same number of molecules

Question 24

Percent Error Equation

Answer 24

Real - Theoretical
————————– x 100
Theoretical