Gases

Question 1

Gas pressure

Answer 1

From collisions between molecules and container walls

Question 2

Atmospheric pressure

Answer 2

Comes from the weight of the atmosphere pushing down

Question 3

Boyles law

Answer 3

At a constant temperature the volume of a gas is inversely proportional to pressure. V ~ 1/P or PV = constant

Question 4

Charles’ Law

Answer 4

At a constant pressure, volume of gas is directly proportional to temperature (decrease temperature decrease volume)

Question 5

Avogadro’s theoreom

Answer 5

Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules

Question 6

Uses of the ideal gas law

Answer 6

• pressure of a gas when volume & temp. are known
• changes in P, V, T
• stoichiometry calculations
• molecular weight (Victor-Meyer experiment)

Question 7

The pressure of a gas mixture depends on the number of moles formula derivation?

Answer 7

PV= (n1+n2+...nN)RT
PV= nEi RT
Pi= niRT/V

Question 8

Dalton’s law

Answer 8

Pressure exerted by a mixture of gases is the sum of the pressures that each would exert if it occupied the volume alone

Question 9

Partial pressure

Answer 9

Pressure that would be exerted by a single component of the mixture

Question 10

Effusion

Answer 10

The passing of a gas through pores. The rate of which is measured by the velocity and density of molecules + size of hole

Question 11

Graham’s law

Answer 11

Rate of effusion depends on square root of molecular weight