Ch5: Gases

B)molecules of real gases occupy no volume.

All of the following statements concerning real cases is correct EXCEPT A) molecules of real gases are attracted to each other. B)molecules of real gases occupy no volume. C)nonideal gas behavior is described by the Van der Waals Equation. D)the pressure of a real gas is due to collisions with the container. E)the pressure of a real gas at low temperatures is lower than for ideal gases.

E)SO2 < NO2 < O2

Arrange the gases according to increasing rate of diffusion at 50°C. A)O2 < NO2 < SO2 B)SO2 < O2 < NO2 C)NO2 < O2 < SO2 D)O2 < SO2 < NO2 E)SO2 < NO2 < O2

B)Boyle's Law

At constant temperature, the volume of the container that a sample of nitrogen gas is in is doubled. As a result the pressure of the nitrogen gas is halved. The amount of nitrogen gas is unchanged in this process. This is an example of: A)Avogadro's Law B)Boyle's Law C)Gay-Lussac's Law D)Dalton's Law E)Charles's Law

D) Gas molecules spread out in a concentration gradient.

Give the definition for diffusion. A) Gas molecules escape from a container into a vacuum through a small hole. B) Gas molecules mix equally. C) Gas molecules mix unequally. D) Gas molecules spread out in a concentration gradient. E) average distance between collision

B)PA = 1.06 atm and PB = 0.53 atm

If 2.0 mol of gas A is mixed with 1.0 mol of gas B to give a total pressure of 1.6 atm, what is the partial pressure of gas A and B? A) PA = 1.0 atm and PB = 2.0 atm B)PA = 1.06 atm and PB = 0.53 atm C)PA = 0.33 atm and PB = 0.67 atm D)PA = 2.0 atm and PB = 1.0 atm E)PA = 0.67 atm and PB = 0.33 atm

E)1/2

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change? A) 8 B)1/8 C)2 D)1/4 E)1/2

T=0 degrees C or 273K P=1atm

Standard Temperature and Pressure (STP)

Mole Fraction/Ratio

The ratio of moles of what you've been given in a reaction to what you want to find.

D)van der Waals equation

This equation is used to calculate the properties of a gas under nonideal conditions. A) Avogadro's Law B) Dalton's Law C)Charles's Law D)van der Waals equation E) Boyle's Law

Lowest one and most spread out.

Using the graph below, determine the gas that has the "lowest" density at STP.

Ptotal=P1+P2+P3... PA=nRT/v PB=nRT/v

What is Dalton's Law formula?

P1V1/T1=P2V2/T2

What is the combined gas Law Equation?

d=PM/RT

What is the density formula?

v1/n1=v2/n2 V=n

What is the formula for Avogadro's law?

P1V1=P2V2 OR v=1/p

What is the formula for Boyle's Law?

V1/T1=V2/T2 V=T

What is the formula for Charles' Law?

Xa=na/ntotal

What is the formula for Mole Fraction/Ratio?

PV=nRT

What is the formula for the ideal gas law?

0.0821 L atm / mol K

What is the ideal gas constant (R)?

Dalton's Law of Partial Pressures

Where the partial pressure is in reference to individual gases present in a gas mixture.

D) At constant temperature and moles, a plot of pressure versus the inverse of volume is linear.

Which of the following statements is consistent with Boyle's Law concerning an ideal gas? A)At constant temperature and moles, a plot of volume versus pressure is linear. B)At constant pressure and moles, a plot of temperature versus volume is linear. C)At constant temperature and pressure, a plot of moles versus volume is linear. D)At constant temperature and moles, a plot of pressure versus the inverse of volume is linear. E) At constant pressure and volume, a plot of temperature versus moles is linear.

E) A, B, and C

Which of these properties is/are characteristic(s) of gases? A) Formation of homogeneous mixtures regardless of the nature of gases B) Relatively large distances between molecules C) High compressibility D)A and B. E) A, B, and C

Charles' Law

demonstrates the relationship between the temperature and volume of gas at constant pressure and number of moles. As the temperature increases, the volume also increases.

Avogadro's Law

relationship between volume and moles while keeping pressure and temperature constant.

Boyle's Law

shows that there is an inverse relationship between pressure and volume of a gas at constant temperature and number of moles. If pressure increases than volume decreases.

22.4L

the volume of one mole of gas at STP

P1/T1=P2/T2

what is the formula for Gay-Lussics Law?