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CHEM 1000 > Thermochemistry > Flashcards

Thermochemistry Flashcards

1
Q

What is energy?

A

Capacity to do work

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2
Q

What is work?

A

Result of force acting through a distance

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3
Q

What is heat?

A

Flow of energy caused by tempersture difference

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4
Q

What is the system vs the surroundings?

A

What we chose to study

Everything the system can exchange energy with

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5
Q

How to convert joules to calories?

A

Multiply by 4.184

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6
Q

What is the internal energy (U) of a system?

A

Sum of kinetic and potential energies of all particles that compose the sustem

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7
Q

What is the equation for the change in internal energy?

A

delta U= q+w

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8
Q

What are the sign conventions for heat?

A

Positive system GAINS energy

Negative system LOSES energy

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9
Q

What are sign conventions for work?

A

Positive work done ON the system

Negative work done BY the system

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10
Q

What are sign conventions for delta U?

A

+ energy flows INTO the system
- energy flows OUT of system

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11
Q

Since nervy must be conserved -delta U of the system equals?

A

Delta U of surroundings

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12
Q

What is the equation for heat?

A

q=mcdeltaT

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13
Q

What is equation for molar heat capacity?

A

q=ncdeltaT

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14
Q

How can you solve a problem where equilibrium is reached between aluminum and water?

A

-qAl=qH2O

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15
Q

How can you calculate work?

A

w=-PdeltaV

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16
Q

How many liters are in a m^3

A

1000

17
Q

What is the formula for work that uses the change in coefficients?

A

w=-detanRT

18
Q

If the volume is constant what does the heat equal?

A

The change in internal energy

19
Q

How can we relate the temperature change to the heat ablatives by a calorimeter?

A

qcal=CcaldeltaT

20
Q

If no heat escapes the calorimeter the heat gained by the calorimeter equals?

A

The heat released by reaction

qcal=-qr

21
Q

What is enthalpy?

A

Heat involved in reaction at constant pressure

22
Q

What is the formula for the change in enthalpy?

A

deltaH=deltaU+PdeltaV

23
Q

What does heat at constant pressure equal?

A

Change in enthalpy

24
Q

The formula for enthalpy of reaction is?

A

DeltarH=DeltarU+deltanRT

25
Q

What does delta n stand for?

A

change in coefficients of gases in balanced chemical equations

26
Q

What does heat divided by moles equal?

A

DeltarH

27
Q

In coffee cup calorimeters the heat gained by the solution is equal to?

A

Heat lost by reaction

qsol’n=-qr

28
Q

In coffee cup calorimeters qr equals?

A

qr=qp=deltaH

29
Q

What does bomb calorimeters measure?

A

Change in internal energy

30
Q

What is coffee cup calorimeter used to determine?

A

deltarH

31
Q

What is the formula for q solution?

A

Qsoln=msoln csoln deltaT

32
Q

How can you find moles?

A

Dividing mass by molar mass or ideal gas law

33
Q

How many joules are in one L bar?

A

100

CHEM 1000 (8 decks)

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