entropy Flashcards

1
Q

what is entropy?

A

a measure of disorder

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2
Q

What dpes entropy explain

A

why spontaneous reactions occur on their own

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3
Q

Phsyical state: entropy

Solid

A

ordered, and regular =low entropy

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4
Q

Gas

A

disordered and random arrangement = High entropy

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5
Q

Why does dissolving a sold increase its enthalpy?

A

dissolved particles can move freely and aren’t ordered - change is positive

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6
Q

if there’s a positive sign/

A

change in state increases in entropy

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7
Q

if there’s a negative sign?

A

change in state decreases entropy

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8
Q

Calculation for entropy changes

A

Sproducts - S reactants

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9
Q

what is free energy change?

A

a measure of whether a reaction is feasible

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10
Q

when is a reaction feasible?

A

when the free energy change is less or equal to zero

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11
Q

the equation for FEG

A

AG = AH - TAS

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12
Q

The effect of temperature of feasibility

- if its an exo reaction and the entropy is positive

A

the reaction is feasible at all temperatures

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13
Q

if its an endo reaction the entropy change is negative

A

the reaction is not feasible at any temp

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14
Q

if its and endo reaction and positive entropy change

A

the reaction is feasible above certain temps

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15
Q

If the entropy is negative and the reaction is exo

A

its feasible below certain temps

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