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GC2 Entropy

Total questions: 50

Worksheet time: 34mins

Name
Class
Date
1.

What is the symbol for entropy?

a)

H

b)

G

c)

S

d)

E

2.

Entropy is a measure of

a)

accuracy

b)

precision

c)

the disorder of a system

d)

the attraction of a nucleus for an electron

3.

Which of these processes represents a decrease in entropy?

a)

sublimation of CO2

b)

boiling water

c)

condensation of steam on cold glass

d)

NaCl dissolving in water

4.

Which of these reactions shows a DECREASE in entropy?

a)

CaCO3(s) → CaO(s) + CO2(g)

b)

3O2(g) → 2O3(g)

c)

2NH3(g) → 3H2(g) + N2(g)

d)

C6H6(l) → C6H6(g)

5.

The entropy will usually increase when

a)

a molecule is broken into two or more smaller molecules

b)

a reaction occurs that results in an increase in the number of moles of gas

c)

a solid changes to a liquid

d)

all of these

6.

Which reaction has a +ΔS ?

a)

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

b)

H2O(g) + CO2(g) → H2CO3(aq)

c)

H2(g) + I2(g) → 2Hl(g)

d)

C2H2O2(g) → 2CO(g) + H2(g)

7.

Systems in nature tend to undergo changes toward

a)

lower energy and less disorder

b)

lower energy and more disorder

c)

higher energy and less disorder

d)

higher energy and more disorder

8.

Which sample has the lowest entropy?

a)

1 mole of KNO3(l)

b)

1 mole of KNO3(s)

c)

1 mole of H2O(l)

d)

1 mole of H2O(g)

9.

Entropy increases from solid, liquid to gas. Why?

a)

Molecular disorder increases

b)

Molecules increase in number from solid to gas

c)

Molecules are heavier in solid

d)

Molecules are more reactive

10.

Which sample has the lowest entropy?

a)

1 mole of HNO3(aq)

b)

1 mole of KNO3(s)

c)

1 mole of H2O(l)

d)

1 mole of N2O(g)

11.

Which state of matter has the greatest motion and least orderly arrangement?

a)

solid

b)

liquid

c)

gas

d)

aqueous

12.

Which phase change represents a decrease in entropy?

a)

solid to liquid

b)

gas to liquid

c)

liquid to gas

d)

solid to gas

13.
Entropy always increases when
a)
enthalpy decreases.
b)
temperature decreases.
c)
temperature increases.
d)
volume increases.
14.

Given the change of phase:  CO2(g) →\rightarrow  CO2(s)

As CO2(g) changes to CO2(s), the entropy of the system

a)

decreases

b)

increases

c)

remains the same

15.

What phase of matter has the most entropy?

a)

solid

b)

liquid

c)

gas

16.

Entropy of a system increases when a reaction increases the number of particles.

a)

True

b)

False

17.

Which represents a decrease in entropy?

a)

sublimation of CO2

b)

boiling water

c)

condensation of steam on cold glass

d)

NaCl dissolving in water

18.

Predict the entropy change for this reaction 

  N2O4(g)N_2O_4\left(g\right)   →  2NO2(g)2NO_2\left(g\right)   

a)

ΔS = +ve and non spontaneous

b)

ΔS = -ve and spontaneous

c)

ΔS = -ve and non spontaneous

d)

ΔS = +ve and spontaneous

19.

Which of the reactions below has a negative ∆S?

a)

CuCO3 (s) + 2HCl (aq) → CuCl2 (aq) + CO2 (g) + H2O (l)

b)

C (s) + O2 (g) → CO2 (g)

c)

CuO (s) + H2SO4 (aq) → CuSO4 (aq) + H2O (l)

d)

BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)

20.

What is a spontaneous process ?

a)

slow process

b)

fast process

c)

process that needs an external intervention to occur

d)

process that does not need external intervention to occur / keep happening

21.

The following statements are true for entropy EXCEPT

a)

entropy is the measure of molecular disorder

b)

entropy is greater if matter is more dispersed

c)

gases have more entropy than liquids of the same substance and temperature

d)

lowering the temperature causes entropy to increase.

22.
Entropy increases from solid, liquid to gas. Why?
a)
Molecular disorder increases
b)
Molecular randomness decreases
c)
Molecules are more energetic
d)
Molecules are more reactive
23.
Which statement is TRUE about entropy for a spontaneous reaction?
a)
ΔSuni is always decreasing
b)
ΔSuni = +ve
c)
ΔSuni = -ve
d)
ΔSuni = 0
24.
Standard molar entropy is shown below. The following statements are true EXCEPT
a)
Entropy for solid is lowest
b)
Entropy for gas is highest
c)
Increase in entropy from solid to gas
d)
Increase in orderliness from solid to gas
25.
Predict the entropy change and its spontaniety
a)
ΔS = +ve and non spontaneous
b)
ΔS = -ve and spontaneous
c)
ΔS = -ve and non spontaneous
d)
ΔS = +ve and spontaneous
26.
Predict the entropy change and its spontaniety
a)
ΔS = +ve and non spontaneous
b)
ΔS = -ve and spontaneous
c)
ΔS = -ve and non spontaneous
d)
ΔS = +ve and spontaneous
27.
Predict the entropy change and its spontaniety
a)
ΔS = +ve and non spontaneous
b)
ΔS = -ve and spontaneous
c)
ΔS = -ve and non spontaneous
d)
ΔS = +ve and spontaneous
28.
Predict the entropy change, ΔS.
a)
ΔS = +ve
b)
ΔS = -ve
c)
ΔS = 0
d)
ΔS = no change
29.
Predict the entropy change, ΔS.
a)
ΔS = +ve
b)
ΔS = -ve
c)
ΔS = 0
d)
ΔS = no change
30.
Predict the entropy change, ΔS.
a)
ΔS = +ve
b)
ΔS = -ve
c)
ΔS = 0
d)
ΔS = little change
31.
Predict the entropy change, ΔS.
a)
ΔS = +ve
b)
ΔS = -ve
c)
ΔS = 0
d)
ΔS = no change
32.

Given the change of phase:

CO2(g) —> CO2(s)

As CO2(g) changes to CO2(s), the entropy of the system

a)

decreases

b)

increases

c)

remains the same

33.

Which phase change represents a decrease in entropy?

a)

solid to liquid

b)

gas to liquid

c)

liquid to gas

d)

solid to gas

34.

Which involves an increase in entropy? (if needed, select more than one answer)

a)

spraying an air freshener

b)

picking up apples off the ground

c)

dropping an egg on the floor

d)

arranging a deck of cards by suit

35.

ΔS will be positive for the reaction

a)

2H2 (g) + O2 (g) -> 2H2O (g)

b)

2NO2 (g) -> N2O4 (g)

c)

BaF2 (s) ->Ba2+ (aq) + 2F- (aq)

d)

2Hg (l) + O2 (g) ->2HgO (s)

36.

A reaction that is not spontaneous at low temperature can become spontaneous at high temperature if ΔH is __________ and ΔS is __________.

a)

+, +

b)

-, -

c)

+, -

d)

-, +

37.
Entropy always increases when
a)
enthalpy decreases.
b)
temperature decreases.
c)
temperature increases.
d)
volume increases.
38.
An increase in  numbers of moles from reactants to products (e.g. 3A  --> 4 B) would cause a decrease in entropy.
a)
True
b)
False
39.
For the following reaction indicate if entropy is increased or decreased.    2N2(g)  +  3 H2(g)  ------->  2 NH3(g)
a)
increase
b)
decrease
40.
For the following reaction indicate if entropy is increased or decreased.     KClO3(s)  ------>  KCl(s)  +  O2(g) 
a)
increase
b)
decrease
41.

What is a spontaneous process ?

a)

slow process

b)

fast process

c)

process that needs an external intervention to occur.

d)

process that does not need external intervention to occur

42.

dissolving sugar ________-.

a)

decreases the entropy

b)

increases the entropy

43.

When ammonium nitrate dissolves in water, the solution gets cold. Which is true?

a)

Reaction is ENDOTHERMIC with positive ΔS

b)

Reaction is ENDOTHERMIC with -ΔH

c)

Reaction is EXOTHERMIC with a -ΔH

d)

Reaction is EXOTHERMIC with +ΔS

44.

The measure of disorder in a system is

a)

entropy

b)

enthalpy

c)

exothermic

d)

endothermic

45.

I2(s) + energy → I2(g)

As I2(s) sublimes to I2(g), the entropy

a)

increases: particles are less randomly arranged

b)

increases: particles are more randomly arranged

c)

decreases: particles are less randomly arranged

d)

decreases: particles are more randomly arranged

46.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
47.

As NaCl dissolves according to the equation

NaCl(s) → Na+(aq) + Cl-(aq), the entropy of the system

a)

Increases

b)

Decreases

c)

Remains the same

48.

Entropy can be described as

a)

the dispersal of matter

b)

the dispersal of energy

c)

the degree of disorder

d)

all of these

49.

Which of the following produces a decrease in the entropy of the system?

a)

dissolving solid KCl

b)

mixing 2 gases into one container

c)

melting ice to make water

d)

freezing water to form ice

50.

Which of the following would have the highest entropy?

a)

A cold solid

b)

A hot liquid

c)

A hot gas

d)

A cold gas

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