Thermodynamics Test

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Thermodynamics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

In an open system, which if the following take place ?

A
The boundaries permit the flow of matter into or out of it

B
The boundaries prevent the flow of matter but not of energy

C
The boundaries prevent the flow of energy into it

D
The boundaries prevent the flow of matter into or out of it

Solution

In open system there is flow of matter and energy in and out of the system or vice versa.

For example, an air compressor in which the air enters at a low pressure and exit at high pressure and there is energy interaction with the surrounding
Question 2
1 / -0

The relationship between C_p and C_v for one mole of an

A
C_pC_V= R

B
C_p− C_V= R

C
C_p− C_V= 2R

D
C_p+ C_V= R

Solution

For a mole of ideal gas, The difference between Cp and Cv is always constant i.e. equals to gas constant.

Therefore, for one mole of an ideal gas, C_p- C_V = R
Question 3
1 / -0

The region outside the boundary of a system is known as a/an

A
isolated system

B
open system

C
surrounding

D
closed system
Question 4
1 / -0

According to first law of thermodynamics ΔU = q + w, here what is sign of q and w ?

A
'q' is negative if heat is transferred into the system and 'w' is negative if work is done on the system

B
'q' is positive if heat is transferred into the system and 'w' is positive if work is done by the system.

C
'q' is positive if heat is transferred into the system and 'w' is positive if work is done on the system.

D
'q' is negative if heat is transferred from the system and 'w' is negative if work is done by the system

Solution

The first law is simply a conservation of energy equation. q is positive if heat is added to the system, and negative if heat is removed; w is positive if work is done on the system, and negative if work is done by the system.
Question 5
1 / -0

The following question has four choices out of which ONLY ONE is correct.

Which of the following statements is false?

A
Work is a state function.

B
Entropy is a state function.

C
Change in the state is completely defined when the initial and final states are specified.

D
Work appears at the boundary of the system.
Question 6
1 / -0

For the reaction C (graphite) + 1/2 O₂(g) → CO(g)at 298 K and 1 atm, △H = -26.4kcal. What is △E if the molar volume of graphite is 0.0053 L? (Given: R = 0.002 kcal mol^-1 K^-1)

A
-26.7 kcal

B
+26.7 kcal

C
-52.4 kcal

D
+52.4 kcal
Question 7
1 / -0

The molar specific heat capacity of a substance is the

A
quantity of heat needed to raise the temperature of one mole by one degree celsius or one kelvin.

B
quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit

C
quantity of heat needed to raise the temperature of one gram by one degree celsius

D
quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit

Solution

Molar specific heat capacity can be defined as the amount of heat energy required to raise the temperature of 1 mole of a substance by 1° C.
Question 8
1 / -0

Which among the following is not a state function?

A
Internal energy

B
Free energy

C
Work

D
Enthalpy
Question 9
1 / -0

Which law of thermodynamics introduces the concept of entropy?

A
First law

B
Zeroth law

C
Third law

D
Second law
Question 10
1 / -0

An exothermic process

A
results in a increase in the enthalpy of the system

B
results in a decrease in the enthalpy of the system

C
results in a decrease in the temperature of the system

D
results in a increase in the internal energy of the system

Solution

Exothermic process results in decrease in enthalpy of system hence for exothermic reaction ΔH= -ve.

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Thermodynamics Test - 3

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Thermodynamics Test - 3

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Question 1

The boundaries permit the flow of matter into or out of it

The boundaries prevent the flow of matter but not of energy

The boundaries prevent the flow of energy into it

The boundaries prevent the flow of matter into or out of it

Solution

Question 2

CpCV= R

Cp− CV= R

Cp− CV= 2R

Cp+ CV= R

Solution

Question 3

isolated system

open system

surrounding

closed system

Question 4

'q' is negative if heat is transferred into the system and 'w' is negative if work is done on the system

'q' is positive if heat is transferred into the system and 'w' is positive if work is done by the system.

'q' is positive if heat is transferred into the system and 'w' is positive if work is done on the system.

'q' is negative if heat is transferred from the system and 'w' is negative if work is done by the system

Solution

Question 5

Work is a state function.

Entropy is a state function.

Change in the state is completely defined when the initial and final states are specified.

Work appears at the boundary of the system.

Question 6

-26.7 kcal

+26.7 kcal

-52.4 kcal

+52.4 kcal

Question 7

quantity of heat needed to raise the temperature of one mole by one degree celsius or one kelvin.

quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit

quantity of heat needed to raise the temperature of one gram by one degree celsius

quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit

Solution

Question 8

Internal energy

Free energy

Work

Enthalpy

Question 9

First law

Zeroth law

Third law

Second law

Question 10

results in a increase in the enthalpy of the system

results in a decrease in the enthalpy of the system

results in a decrease in the temperature of the system

results in a increase in the internal energy of the system

Solution

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C_pC_V= R

C_p− C_V= R

C_p− C_V= 2R

C_p+ C_V= R