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Topic 9 – Kinetics and Equilibrium

14. Entropy: Determining entropy change based on phase, temperature, or chemical change
1. Which phase change represents an increase in entropy?
1) Liquid to gas 3) Liquid to solid

2) Gas to solid 4) Gas to liquid

2. Which change will result in the particles becoming less random?
1) Solid to liquid 3) Liquid to gas
2) Solid to gas 4) Liquid to solid

3. Which change results in an increase in entropy?
1) H2O(g) ----- H2O(l) 3) H2O(s) ----- H2O(l)
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2) H2O(l) ------- H2O(s) 4) H2O(g) ---- H2O(s)

4. In which system will there be a decrease in entropy as bromine undergoes a phase change?
1) Br2(s) ----- Br2(l) 3) Br2(l) ------ Br2(g)
2) Br2(g) ----- Br2(l) 4) Br2(s) ------ Br2(g)

5. Which process is accompanied by a decrease in entropy?
1) Evaporation of water 3) Melting of ice
2) Condensing of steam 4) Sublimation of ice
2) 15 C to 20 C Teacher Preview Copy
6. Which process is accompanied by an increase in randomness of the particles?
1) Melting

3) Freezing

2) Condensing 4) Crystallization

7. Which temperature change will result in particles of a substance becoming more random?
1) 20 C to 10 C 3) -5 C to 0 C
o
o
o
o
o
o
o
o
2) 10 C to 0 C 4) 0 C to -5 C

8. Substance X is heated from one temperature to another. Which change in temperature of substance X
is accompanied by a decrease in entropy of its particles? o o
o
o
1) -10 C to -20 C 3) -10 C to -5 C
o
o
o
o
4) 10 C to 15 C

9. In which chemical change would there be a change from a state of higher entropy to a state of lower
entropy?
1) X2(g) + Y2(g) ---------- 2XY(g) 3) A(s) + B(l) ----- AB(aq)
2) X2(g) + Y2(g) ------- 2XY(l) 4) A(l) + B(s) ------ AB(g)

10. Which chemical reaction is showing the substances in the reaction going from a state of lower
entropy to a state of higher entropy?
1) H2(g) + O2(g) ------ H2O(l) 3) C(s) + O2(g) ----- CO2(g)
2) H2O (g) + O2(g) ----- H2O(g) 4) C2H2(g) ------------ 2C(s) + O2(g)
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