Fick's First Law (3): Graphical Estimation of Concentration Gradient

The video tutorial by Kevin Tolkoff covers the estimation of concentration gradients on a graph. It begins with a recap of previous concepts related to passive diffusion and flux. The tutorial then focuses on estimating the concentration gradient at a specific point on a graph, explaining the process of determining the slope using a tangent line. The video further elaborates on calculating the concentration gradient in molar terms and discusses Fick's First Law conceptually, emphasizing the importance of understanding concentration gradients and the direction of flux.

What is the primary focus of a graph showing concentration versus position?

• To determine the color of the solution

• To find the net direction of passive diffusion or flux

• To calculate the temperature of the solution

• To measure the volume of the solution

If the concentration gradient is negative, what can be inferred about the direction of flux?

• Flux is to the left

• Flux is to the right

• Flux is downwards

• Flux is upwards

How is the slope of the tangent line at a point on a concentration graph calculated?

• By dividing the change in temperature by the change in position

• By dividing the change in time by the change in concentration

• By dividing the change in concentration by the change in position

• By dividing the change in position by the change in concentration

What is the concentration gradient if the concentration changes from 1.9 molar to 0 molar over a distance of 1.25 meters?

• 0.5 molar per meter

• 1.5 molar per meter

• -1.5 molar per meter

• -0.5 molar per meter

What type of concentration gradient is described if the units are moles per liter per meter?

• Volume concentration gradient

• Density concentration gradient

• Molar concentration gradient

• Molecular concentration gradient