Rank the following from lowest to highest entropy. a)Br2 (l), Br2 (g), I2 (g)(b) C4H8 (l), C4H10 (l), C4H6 (l) Predict the sign of ∆S for the following reactions. (a) H2O (s) → H2O (l) (b) NaCl (s) → NaCl (aq) (c) 3 NO2 (g) + H2O (l) → 2 HNO3 (aq) + NO (g) (d) 4 Fe (s) + 3 O2(g) → 2 Fe2O3 (s) For each reaction below, predict whether the reaction will be always spontaneous, never spontaneous, or sometimes spontaneous depending on temperature. NOTE: We did not really practice this in lecture, but try and use the example of melting ice and its spontaneity as an example. Dispersing heat refers to enthalpy and dispersing matter refers to entropy. Give it a try! A reaction disperses heat and disperses matter A reaction disperses heat, but not matter A reaction requires heat, but disperses matter. A reaction requires heat and does not disperse matter.

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Rank the following from lowest to highest entropy.

a)Br2 (l), Br2 (g), I2 (g)

(b) C4H8 (l), C4H10 (l), C4H6 (l)

Predict the sign of ∆S for the following reactions.
1. (a) H2O (s) → H2O (l)
2. (b) NaCl (s) → NaCl (aq)
3. (c) 3 NO2 (g) + H2O (l) → 2 HNO3 (aq) + NO (g)
4. (d) 4 Fe (s) + 3 O2(g) → 2 Fe2O3 (s)

For each reaction below, predict whether the reaction will be always spontaneous, never spontaneous, or sometimes spontaneous depending on temperature.

NOTE: We did not really practice this in lecture, but try and use the example of melting ice and its spontaneity as an example. Dispersing heat refers to enthalpy and dispersing matter refers to entropy.

Give it a try!

A reaction disperses heat and disperses matter
A reaction disperses heat, but not matter
A reaction requires heat, but disperses matter.
A reaction requires heat and does not disperse matter.

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