Chapter 6: 6.2 Thermodynamics Flashcards

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1
Q

What is the bilayer formation stabilized by?

A

The Hydrophobic Effect

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2
Q

Describe:

Hydrophobic Effect

A

By preventing of nonpolar groups with water, the entropy of water is increased

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3
Q

——— and ——– stability contribute to membrane formation

A
  • Enthalpic
  • Entropic
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4
Q

What does ΔH represent in thermodynamics?

A

Enthalpic stability

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5
Q

What does TΔS represent in thermodynamics?

A

Entropic stability

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6
Q

Enthalpy refers to…

A

Bonds that are formed
* The more negative, the greater the stability

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7
Q

Enthalpy refers to…

A

Molecular motion
* The more positive, the greater the stability

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8
Q

What does ΔG represent in thermodynamics?

A

Stability

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9
Q

How can stability (ΔG) be determined?

A

Using this formula:
ΔG = ΔH + (-TΔS)

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10
Q

Bilayer formation is spontaneous when…

A

ΔG is negative

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11
Q

Describe:

Energy change in Spontaneous Reactions

A

Initial state:
* Higher energy, less stable

Final state:
* Lower energy, more stable

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12
Q

Describe:

Energy change in Non-Spontaneous Reactions

A

Final state:
* Higher energy, less stable

Initial state:
* Lower energy, more stable

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13
Q

More freedom of movement mean:
1. More entropy
2. Less entropy

A

More entropy

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14
Q

What is more entropy represented by in the equation for ΔG?

A

Bigger TΔS

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15
Q

What effect does more entropy have on ΔG?

A

More negative ΔG

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16
Q

Does more entropy result in thermodynamically favourable reactions?

A

Yes

17
Q

Why is there a large ΔS when bilayers form?

A

Before:
* Water molecules surround non-polar tails, their movement is restricted

After:
* Burying the hydrophobic tails away from water
* Allows more freedom of movement of the water molecules