b$.$

Suppose you were given these two schematics $($a$.$ and b$.).$ The materials are made up of orange atoms, gray atoms and vacancies. In a$.,$ the lettered atoms migrate to their new position. In b$.,$ the atoms follow the arrows. Explain your answers in detail.

i$.$ Which is which $-$ self$-$diffusion or chemical diffusion?

ii$.$ Which one or both show the effects of entropy?

iii. Which one or both show the effects of a chemical gradient?

iv$.$ Which one or both shos the effects of an exchange mechanism with vacancies?

v$.$ Which one or both shows the effects of increasing temperature?