Lecture 1: Ion Flux

Question 1

What is ion flux?

Answer 1

The movement of charged particles across a membrane is called ion flux

Question 2

What is Fick’s Law of Diffusion?

Answer 2

Jdf = -D (d[C]/dx)

Question 3

What is the unit for diffusion flux?

Answer 3

Jdf in moles/(sec*cm^2)

Question 4

What is the unit for diffusion coefficient?

Answer 4

D in (cm^2)/sec

Question 5

What is the unit for concentration?

Answer 5

C in molecules/(cm^3)

Question 6

What is the unit for drift flux?

Answer 6

Jdr in moles/(sec*cm^2)

Question 7

What is the unit for valence?

Answer 7

No unit

Question 8

What is the unit for electric potential?

Answer 8

V in V

Question 9

What is the unit for mobility?

Answer 9

Mu in cm/(V*sec)

Question 10

True or False: The e is always the same as q

Answer 10

False

Question 11

True or False: V denotes both electric potential and voltage

Answer 11

True

Question 12

True or False: The membrane potential is solely caused by active transportation

Answer 12

False

Question 13

True or False: A high water partition coefficient means that the substance dilutes very well in water

Answer 13

False, it is very soluble in lipids

Question 14

How do you go from calories to joules?

Answer 14

Multiply by 4.2

Question 15

How do you go from Celsius to Kelvin?

Answer 15

Add 274.15

Question 16

Give the relation between current and flux

Answer 16

I = J(total molar)zF