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Worksheet: Fractional Distillation of Air

Q1:

To within which range of temperatures must air be cooled before it enters the fractionating column?

  • A 1 9 5 to 1 9 0 C
  • B 2 0 0 to 1 9 5 C
  • C 2 1 0 to 2 0 0 C
  • D 2 0 5 to 2 0 0 C
  • E 1 9 0 to 1 8 5 C

Q2:

Which of the following is a common application of both oxygen and chlorine?

  • AThe manufacture of margarine
  • BThe manufacture of steel
  • CThe sterilization of drinking water
  • DThe manufacture of cleaning products
  • EReactants in the contact process

Q3:

Which of the following is a common application of both nitrogen and argon?

  • AManufacture of cleaning products
  • BManufacture of margarine
  • CSterilization of drinking water
  • DPreservation of foods
  • EReactants in the Haber process

Q4:

The components of air can be separated in a fractionating column, as shown.

Fraction A is collected at the top of the column. Which range of temperatures must be maintained at the top of the column?

  • A 1 9 0 1 8 5 t o C
  • B 2 0 0 1 9 5 t o C
  • C 1 8 5 1 8 0 t o C
  • D 1 9 5 1 9 0 t o C
  • E 2 0 5 2 0 0 t o C

Fraction B is collected at the bottom of the column. Which range of temperatures must be maintained at the bottom of the column?

  • A 1 9 0 1 8 5 t o C
  • B 2 0 0 1 9 5 t o C
  • C 1 9 5 1 9 0 t o C
  • D 1 8 5 1 8 0 t o C
  • E 2 0 5 2 0 0 t o C

Identify the major component of fraction A.

  • AGaseous argon
  • BLiquid nitrogen
  • CGaseous nitrogen
  • DLiquid oxygen
  • EGaseous oxygen

Identify the major component of fraction B.

  • ALiquid oxygen
  • BGaseous argon
  • CGaseous oxygen
  • DGaseous nitrogen
  • ELiquid nitrogen

Q5:

Which component of air is the most hazardous when pure?

  • AArgon
  • BCarbon dioxide
  • CNitrogen
  • DOxygen
  • EWater

Q6:

When air is distilled to obtain pure nitrogen, which components undergo changes of state and which changes of state are observed?

  • AOxygen boils
  • BBoth nitrogen and oxygen boil
  • CBoth nitrogen and oxygen sublime
  • DNitrogen boils
  • ENitrogen sublimes

Q7:

The first step in the production of pure nitrogen is to cool air so that the components undergo changes of state. Water is the first component to condense as air is cooled. List the other components of air in the order that they condense or freeze as the temperature decreases.

  • AArgon, carbon dioxide, nitrogen, oxygen
  • BCarbon dioxide, argon, oxygen, nitrogen
  • CNitrogen, carbon dioxide, argon, oxygen
  • DCarbon dioxide, oxygen, argon, nitrogen
  • EArgon, nitrogen, oxygen, carbon dioxide

Q8:

Which synthetic product generates the highest demand for nitrogen as a reactant when manufactured?

  • AFuels
  • BExplosives
  • CMedicines
  • DFertilizers
  • EPlastics

Q9:

At 1 atm pressure, what is the boiling point of oxygen to the nearest °C?

Q10:

All of the components of air form a liquid or a solid when cooled below a critical boiling or sublimation temperature. Which of the five most abundant components of air forms the densest material when cooled to its critical temperature at 1 atm pressure?

  • AOxygen
  • BWater
  • CArgon
  • DCarbon dioxide
  • ENitrogen

Q11:

At 1 atm pressure, what is the boiling point of argon to the nearest °C?

Q12:

Which component of air has the highest bond energy?

  • ACarbon dioxide
  • BOxygen
  • CWater
  • DNitrogen
  • EArgon

Q13:

Why might a second fractional distillation be necessary when separating air into its pure components?

  • ATo separate gaseous oxygen from liquid argon
  • BTo separate gaseous nitrogen from liquid oxygen
  • CTo separate gaseous oxygen from liquid nitrogen
  • DTo separate gaseous argon from liquid oxygen
  • ETo separate gaseous nitrogen from liquid argon

Q14:

Which component of air is the least reactive?

  • ANitrogen
  • BOxygen
  • CWater
  • DArgon
  • ECarbon dioxide

Q15:

At 1 atm pressure, what is the boiling point of nitrogen to the nearest °C?

Q16:

How many of the five most abundant components of air do not form liquids when cooled at 1 atm pressure?

Q17:

Why is the fractional distillation of air described as a physical process?

  • AThe process is reversible.
  • BThe process requires an input of energy.
  • CThe number of molecules does not change during the process.
  • DNo chemical bonds are broken or formed during the process.
  • EThe process involves changes in temperature, a physical variable.

Q18:

Which of the following is a common application of oxygen gas?

  • ASterilization of drinking water
  • BPreservation of foods
  • CManufacture of margarine
  • DManufacture of steel
  • EAs a reactant in the Haber process

Q19:

List the five most abundant components of air in order of increasing molecular mass.

  • ANitrogen < oxygen < argon < water < carbon dioxide
  • BWater < oxygen < nitrogen < carbon dioxide < argon
  • CNitrogen < oxygen < water < carbon dioxide < argon
  • DWater < nitrogen < oxygen < argon < carbon dioxide
  • EOxygen < nitrogen < carbon dioxide < argon < water