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Entropy
Quiz 2
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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
0 h : 0 m : 1 s
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