Q.1
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.2
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.3
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.4
Entropy always increases when
  • enthalpy decreases.
  • temperature decreases.
  • temperature increases.
  • volume increases.
Q.5
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.6
Which phase of matter has the greatest motion and least orderly arrangement?
  • solid
  • liquid
  • gas
Q.7
Entropy is a measure of
  • accuracy
  • precision
  • the disorder of a system
  • the attraction of a nucleus for an electron
Q.8
What phase of matter has the most entropy?
  • solid
  • liquid
  • gas
Q.9
Which phase change represents a decrease in entropy?
  • solid to liquid
  • gas to liquid
  • liquid to gas
  • solid to gas
Q.10
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.11
Identify whether the following result in an increase or decrease in entropy: Gas --> Liquid --> solid
  • increase
  • decrease
Q.12
HCl reacts with Zn giving off heat
  • endothermic
  • exothermic
Q.13
Is the combustion of gasoline endothermic or exothermic?
  • Endothermic
  • Exothermic
Q.14
Reaction of oxygen with hydrogen:(g) + 2H------> 2H+ Energy
  • endothermic
  • exothermic
Q.15
Photosynthesis reaction:6CO2 + 6H+ Energy ------> C6 H+ 6O2
  • endothermic reaction
  • exothermic reaction
Q.16
Condensation and raining are examples of what?
  • Exothermic
  • Endothermic
Q.17
We can reverse a spontaneous process by intervening (eg applying heat, using distillation to separate mixtures).
  • True
  • False
Q.18
There is a natural tendency for energy to spread out.
  • True
  • False
Q.19
In a spontaneous process, the entropy of the universe decreases.
  • True
  • False
Q.20
Entropy of a system increases when a reaction increases the number of particles.
  • True
  • False
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