Cumula Under certain circumstances, potassium ions K+ move across the 8.0-nm-thi

Question

Cumula Under certain circumstances, potassium ions K+ move across the 8.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is -90.0 mV, and the potential outside is zero. Assume that a potassium ton carries a charge of 1.602x10-19 c. Standard 2 Problem 1) What is the change in the electrical potential energy of the potassium ions as they move across the membrane? (Express your answer to three significant figures.) Standard Exe Problem You currently have O submissions for this question. Only 3 submission are allowed You can make 3 more submissions for this question Standard Exers Cumulativ Standard Exerci Problem 7 2) Does their potential energy increase or decrease as they move from the inside to the outside? O increase Standard Exerche Problem 8 decrease Submit Standard Exercise Problem 9 You currently have 1 submissions for this question. Only 3 submission are allowed You can make 2 more submissions for this question. Standard Exercise Problem 10 Your submissions: A

Explanation / Answer

1) change in PE = q deltaV
{ deltaV = Vf - Vi}

= (1.602 x10^-19) (0 - (-90 x 10^-3))

= 1.442 x 10^-20 J

Ans: 1.44  

2) change in Pe is +ve.

So increases.

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