Practice Entropy Multiple Choice Questions with Answers Quiz-2

Q.1.

Which of the reactions below has a negative ∆S?

CuCO3 (s) + 2HCl (aq) → CuCl2 (aq) + CO2 (g) + H2O (l)
C (s) + O2 (g) → CO2 (g)
CuO (s) + H2SO4 (aq) → CuSO4 (aq) + H2O (l)
BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)

Q.2.

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

solid
liquid
gas
aqueous

Q.3.

Which reaction has a +ΔS ?

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
H2O(g) + CO2(g) → H2CO3(aq)
H2(g) + I2(g) → 2Hl(g)
C2H2O2(g) → 2CO(g) + H2(g)

Q.4.

Which of these processes represents a decrease in entropy?

sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water

Q.5.

Which of these reactions shows a DECREASE in entropy?

CaCO3(s) → CaO(s) + CO2(g)
3O2(g) → 2O3(g)
2NH3(g) → 3H2(g) + N2(g)
C6H6(l) → C6H6(g)

Q.6.

Entropy always increases when

enthalpy decreases.
temperature decreases.
temperature increases.
volume increases.

Q.7.

Which sample has the lowest entropy?HINT - Look at the phase of each chemical....

1 mole of KNO3(l)
1 mole of KNO3(s)
1 mole of H2O(l)
1 mole of H2O(g)

Q.8.

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

solid
liquid
gas

Q.9.

Entropy is a measure of

accuracy
precision
the disorder of a system
the attraction of a nucleus for an electron

Q.10.

What phase of matter has the most entropy?

solid
liquid
gas

Q.11.

Which phase change represents a decrease in entropy?

solid to liquid
gas to liquid
liquid to gas
solid to gas

Q.12.

Given the change of phase: CO2(g) —> CO2(s) As CO2(g) changes to CO2(s), the entropy of the system

decreases
increases
remains the same

Q.13.

Identify whether the following result in an increase or decrease in entropy: Gas --> Liquid --> solid

increase
decrease

Q.14.

HCl reacts with Zn giving off heat

endothermic
exothermic

Q.15.

Is the combustion of gasoline endothermic or exothermic?

Endothermic
Exothermic

Q.16.

Reaction of oxygen with hydrogen:(g) + 2H------> 2H+ Energy

endothermic
exothermic

Q.17.

Photosynthesis reaction:6CO2 + 6H+ Energy ------> C6 H+ 6O2

endothermic reaction
exothermic reaction

Q.18.

Condensation and raining are examples of what?

Exothermic
Endothermic

Q.19.

We can reverse a spontaneous process by intervening (eg applying heat, using distillation to separate mixtures).

True
False

Q.20.

There is a natural tendency for energy to spread out.

True
False

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