Gaseous Matter

Question 1

Define: Pressure

Answer 1

Force per unit area

Question 2

What is the SI (International System of Units) unit for pressure?

Answer 2

Pa (Pascal), Kpa (Kilopascal)

Question 3

________ Kpa is equivalent to 1 atm (atmospheric pressure)

Answer 3

101.325 Kpa

Question 4

How much mm Hg (millimeters of mercury) is in 1 Kpa?

Answer 4

1 Kpa = 7.5 mm Hg

Question 5

How much mm Hg (millimeters of mercury) is in 1 atm?

Answer 5

1 atm = 760 mm Hg

Question 6

Pascal x _________ = kilopascal (Kpa)

Answer 6

1000

Question 7

STP stands for…

Answer 7

Standard temperature and pressure

Question 8

SATP stands for…

Answer 8

Standard ambient temperature and pressure

Question 9

Why is SATP generally used over STP?

Answer 9

SATP is more practical

Question 10

What is atmospheric pressure (atm)?

Answer 10

The pressure exerted by the air on an object

Question 11

There is an ______________ relationship between pressure and volume

Answer 11

Inverse

Question 12

What does Boyle’s Law state?

Answer 12

As the pressure on a gas increases, the volume of the gas decreases

Question 13

What is the equation for Boyle’s Law?

Answer 13

P1 x V1 = P2 x V2

P x V = K

Question 14

What does Boyle’s Law allow us to do?

Answer 14

Compare any two sets of pressure and volume measurements

Question 15

0°C = __________K

Answer 15

273.15K

Question 16

What is absolute zero?

Answer 16

Absolute Zero = 0 K (-273.15°C)

• Zero energy, stop moving
• Limit of the temperature scale

Question 17

There is a ___________ relationship between temperature and volume

Answer 17

Direct

Question 18

What does Charles’ Law state?

Answer 18

As the temperature of a gas increases, the volume increases proportionally

Question 19

What is the equation for Charles’ Law?

Answer 19

V / T = K

V1 / T1 = V2 / T2

Question 20

What does Charles’ Law allow us to do?

Answer 20

It allows us to compare any two sets of temperature and volume measurements

Question 21

Boyle’s Law can only be used when the _____________ is kept constant

Answer 21

Temperature

Question 22

Charles’ Law can only be used when the _____________ is kept constant

Answer 22

Pressure

Question 23

What does the Combined Gas Law state?

Answer 23

For a sample of gas, the ratio of the product of the original pressure and volume to the original temperature will equal the ratio of the product of a new pressure and volume to the new temperature

Question 24

What is the equation for the Combined Gas Law?

Answer 24

(P x V) / T = K

(P1 x V1) / T1 = (P2 x V2) / T2

Question 25

When should the combined gas law be used?

Answer 25

When all three variables (temperature, pressure and volume) are changing

Question 26

What does the Law of Combining Volumes state?

Answer 26

When measured at the same temperature and pressure, volumes of gaseous reactants and products of chemical reactions are always in simple ratios of whole numbers

Question 27

Who devised the Law of Combining Volumes

Answer 27

Gay - Lussac

Question 28

What did Avogadro's theory state?

Answer 28

Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules (supported the Law of Combining Volumes)