Free Printable Diffusion Post-Session

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Diffusion Post-Session

Total questions: 10

Worksheet time: 8mins

Name

Class

Date

Diffusion is defined as mass transport of atoms

True

False

Which is NOT a mechanism of diffusion?

Interstitial diffusion

Substitutional diffusion

Interfacial diffusion

Diffusion can occur slowly or rapidly. Which is NOT a condition for slow diffusion?

Close-packed system

Low density of atoms

High density of atoms

Large atoms

Diffusion can occur slowly or rapidly. Which is NOT a condition for fast diffusion?

Open system

Small atoms

Secondary bonding

Covalent bonding

Ficke's First Law of Diffusion shows a concentration gradient in space.

True

False

Ficke's Second Law of Diffusion shows a concentration gradient in time.

True

False

Diffusivity of a material is assumed to be independent of species concentration.

True

False

Which arrhenius equation is used to determine the diffusivity / diffusion coefficient?

$N_V=N\exp\left(-\frac{Q_V}{kT}\right)$

$D=D_0\exp\left(-\frac{Q_D}{RT}\right)$

$D_0=D\exp\left(-\frac{Q_D}{RT}\right)$

$D=D_0\exp\left(-\frac{Q_D}{kT}\right)$

Calculate the diffusivity of carbon in iron at 1050^oC.

NOTE: Use Equation Booklet to find D₀, Q_D, and R.

9.419x10^-11 m²/s

3.276x10^-11 m²/s

8.114x10^-9 m²/s

3.880x10^-10 m²/s

10.

Calculate the flux of carbon through a plate. The high concentration area has a concentration of 1.0 kg/m³, while the low concentration area has a concentration of 0.2 kg/m³. The thickness of the plate is 7 mm and it has a diffusivity of 3.5x10^-11 m²/s.

4.67x10^-9 kg/m²s

2.625x10^-13 kg/m²s

1.08x10^-8 kg/m²s

4.00x10^-9 kg/m²s

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Diffusion Post-Session

Total questions: 10

Worksheet time: 8mins

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