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Chem 152 > Chem 152 Exam 1 > Flashcards

Chem 152 Exam 1 Flashcards

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1
Q

What is an increase in entropy?

A

Solid<Liquid<Gas

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2
Q

What signs of Delta H and Delta S make Delta G spontaneous at all temperatures?

A

Negative Delta H and Positive S

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3
Q

Formula for finding Temperature given Delta G,S,H

A

Delta G minus Delta H Divided Delta S

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4
Q

What is the equation looking for when asking to find the over all rate?

A

Rate=k[A][B] to their respectives powers

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5
Q

True or False: Heat is one way in which energy flows

A

True

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6
Q

True or False: Entopy has units of kJ/mol

A

True

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7
Q

True or False: a nonspontaneous process can occur if work is done on the system. When this happens, the 2nd law of thermodynamics is violated.

A

False

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8
Q

True or False: A negative sign for Delta S rxn indicates that the reaction will defintely be nonspontanous

A

False

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9
Q

True or False: A negative sign for Delta H indicated that the reaction is exothermic

A

True

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10
Q

True or False: The entropy change on melting is always negative

A

False

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11
Q

True or False: The rate of disappearance of a reactant is expressed with a negative number

A

True

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12
Q

True or False: the rate of a zero order is independent of the concentration of reactants.

A

True

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13
Q

What is ALWAYS true for a SPONTANEOUS reaction?

A

Delta S Universe is greater than 0 and Delta G system is less than 0

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14
Q

What conditions will cause a reaction that is nonspontaneous at room temperature to become spontaneous as the temperature decreases?

A

Negative Delta S and Delta H

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15
Q

How to find Delta Surroundings?

A

Minus Delta H of system divided by Temperature

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16
Q

How to find Delta S Universe?

A

Delta S Universe = Delta System + Delta Surroundings

17
Q

What reactions are endothermic?

A

Up hill or noticing that the Temperature goes down

18
Q

What reactions are exothermic?

A

Down hill or noticing that the Temperature goes up

19
Q

What is exothermic?

A

The loss of temperature to the surroundings

20
Q

What is endothermic?

A

The gaining of heat

21
Q

Second Law of Thermodynamics is

A

The entropy of the Universe which means that it increases in a spontaneous process and remains unchanged at equilibrium.

22
Q

Negative Delta H is?

A

exothermic

23
Q

Positive Delta H is?

A

endothermic

Chem 152 (7 decks)

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