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# Increase in Entropy

Thinking about entropy as disordered states, which of the following reactions would show an increase in entropy? Mark those in which entropy increases as TRUE.

None of these reactions are balanced.

H2 + O2 &#8594; H2O

1. True
2. False

CaCO3 &#8594; CaO + CO2
1. True
2. False

H2O(l) &#8594; H2O(s)
1. True
2. False

S8(s) &#8594; S(g)

1. True
2. False

Na + Cl2 &#8594; NaCl
1.True
2. False

N2O &#8594; N2 + O2
1. True
2. False

C6H12O6 + O2 &#8594; CO2 + H2O
1. True
2. False

Hg(l) &#8594; Hg(g)

1. True
2. False

Cu + O2 &#8594; CuO
1. True
2. False

CO2 + H2 &#8594; C + H2O

1. True
2. False

#### Solution Preview

H2 + O2 &#8594; H2O
Entropy does not increase here because the number of molecules decreases. In other words, there is now more order in the universe, not less.

CaCO3 &#8594; CaO + CO2
This is the reverse of the equation above. We go from there being one chemical formula to two chemical formulae. Therefore, the randomness of the universe increased. Entropy ...

#### Solution Summary

The solution considers the entropy changes in a number of reactions.

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