Worksheet: Diffusion

In this worksheet, we will practice describing diffusion in gases and liquids and explaining the process using Brownian motion.

Q1:

In a warm laboratory, the smell of ammonia produced by a beaker of ammonium hydroxide is noticed more quickly than in a cold laboratory. Which of the following statements explains this observation?

  • AThe molecules of ammonia condense further from the beaker in a warm laboratory.
  • BThe molecules of ammonia evaporate further from the beaker in a warm laboratory.
  • CThe molecules of ammonia condense closer to the beaker in a warm laboratory.
  • DThe molecules of ammonia diffuse closer to the beaker in a warm laboratory.
  • EThe molecules of ammonia diffuse further from the beaker in a warm laboratory.

Q2:

Which of the following statements could describe particles moving with Brownian motion?

  • ARandomly moving particles suspended in a solid
  • BVibrating particles suspended in a liquid
  • CVibrating particles suspended in a liquid or a gas
  • DRandomly moving particles suspended in a liquid or a gas
  • EVibrating particles suspended in a solid

Q3:

Which of the following statements correctly describes a difference between two diatomic gases, nitrogen (N)2 and chlorine (Cl)2?

  • ANitrogen diffuses more slowly than chlorine as its molecular mass is smaller.
  • BNitrogen diffuses more quickly than chlorine as its molecular mass is smaller.
  • CNitrogen diffuses more slowly than chlorine as it is less reactive.
  • DNitrogen and chlorine diffuse at the same speed.
  • ENitrogen diffuses more quickly than chlorine as its molecular mass is bigger.

Q4:

The diagram represents molecules of bromine gas (red circles) diffusing into the air (orange circles). What happens next to the bromine molecules after the initial stages of diffusion seen in the diagram?

  • AThe bromine molecules react with substances in the air.
  • BThe bromine molecules vibrate in place.
  • CThe bromine molecules spread out further into the air.
  • DThe bromine molecules condense back together.
  • EThe bromine molecules settle on the ground.

Q5:

Nitrogen dioxide is an atmospheric pollutant produced by some cars. Which of the following statements explains how the gas spreads out into the atmosphere?

  • AThe NO2 molecules move from an area of high concentration near the car to an area of low concentration in the atmosphere by evaporation.
  • BThe NO2 molecules move from an area of low concentration near the car to an area of high concentration in the atmosphere by diffusion.
  • CThe NO2 molecules move from an area of high concentration near the car to an area of low concentration in the atmosphere by diffusion.
  • DThe NO2 molecules move from an area of low concentration near the car to an area of high concentration in the atmosphere by evaporation.

Q6:

What effect will increasing the temperature have on the rate of diffusion?

  • AThe rate of diffusion will decrease then increase.
  • BThe rate of diffusion will increase.
  • CThe rate of diffusion will increase then decrease.
  • DThe rate of diffusion will decrease.
  • EThe rate of diffusion will stay the same.

Q7:

Pollen floating on water can be viewed through a microscope to observe Brownian motion. Which of the following describes the movement of the pollen particles?

  • AIn the same direction
  • BAligned with magnetic north
  • CVibrations about a fixed point
  • DAt random
  • EIn circles

Q8:

What name is given to the random movement of particles of clay suspended in water?

  • AFick’s law
  • BVibratory motion
  • CBrownian motion
  • DOscillating motion
  • EGraham’s law

Q9:

Which physical process causes the blue color from the food colorant to spread through the water?

Blue water-72
  • ADiffusion
  • BNeutralization
  • CEvaporation
  • DSublimation
  • EMelting

Q10:

Which of the following alkanes diffuses the quickest?

  • A
    CHHHCHCHCHHHHCHHH
  • B
    CHHHH
  • C
    CHHCHHCHCHHHHH
  • D
    CHCHHHHH
  • E
    CHHCHHHCHHH

Q11:

Brownian motion can be observed by viewing smoke particles under a microscope. What causes the Brownian motion in smoke particles?

  • AThe smoke particles are diffusing.
  • BThe smoke particles are reacting to the light of the microscope.
  • CThe smoke particles are colliding with each other.
  • DThe smoke particles are being hit by particles in the air.
  • EThe smoke particles have their own kinetic energy.

Q12:

Diffusion could be used as a technique to separate which of the following mixtures?

  • AWater from aqueous potassium chromate(V)
  • BSand from a mixture of sand and water
  • CHexane from crude oil
  • DMagnesium chloride from a solution of aqueous magnesium chloride
  • EHydrogen from a mixture of hydrogen and nitrogen

Q13:

When hydrogen chloride (HCl) gas and ammonia (NH)3 gas meet inside a thin glass tube, a chemical reaction takes place and a ring of solid ammonium chloride (NHCl)4 forms on the inside of the glass. Why does the ring of ammonium chloride form nearer to the end containing the HCl?

  • ANH3 diffuses faster than HCl as NH3 has a greater molecular mass than HCl.
  • BHCl diffuses faster than NH3 as HCl has a greater molecular mass than NH3.
  • CHCl diffuses faster than NH3 as a molecule of HCl has fewer atoms than a molecule of NH3.
  • DHCl diffuses faster than NH3 as HCl has a lower molecular mass than NH3.
  • ENH3 diffuses faster than HCl as NH3 has a lower molecular mass than HCl.

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