Endothermic Rxn: Ba(OH)2·8H2O & NH4NO3 Heat Dynamics

Chapter 0, Problem 5

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QUESTION:

You mix solid hydrated barium hydroxide, \(\mathrm{Ba}{(\mathrm{OH})_2}\cdot8{\mathrm{H}_2}\mathrm{O}\left( s \right)\), and solid ammonium nitrate, \(2\mathrm{NH}_4\mathrm{NO}_3\left( s \right)\), in a beaker. The reaction is shown here. A small pool of water in contact with the outside of the beaker freezes.

\(\mathrm{Ba}{(\mathrm{OH})_2}\cdot8{\mathrm{H}_2}\mathrm{O}\left( s \right)+2\mathrm{NH}_4\mathrm{NO}_3\left( s \right)\rightarrow2\mathrm{NH}_3\left( g \right)+10\mathrm{H}_2\mathrm{O}\left( l \right)+\mathrm{Ba}(\mathrm{NO}_3)_2\left( aq \right)\)

a. List all the substances that are part of the system.

b. List at least four objects that are part of the surroundings.

c. Which is at a lower temperature: \(\mathrm{NH}_4\mathrm{NO}_3\left( s \right)\) or \(\mathrm{Ba}(\mathrm{NO}_3)_2\left( aq \right)\)? Explain your thinking.

d. What will you feel if you touch the beaker?

e. Is the reaction endothermic or exothermic? Explain your thinking.

f. What evidence do you have that heat is transferred from the surroundings to the products of the reaction?

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Endothermic Rxn: Ba(OH)2·8H2O & NH4NO3 Heat Dynamics
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Explore the endothermic reaction between Ba(OH)2·8H2O and NH4NO3 observing its impact on surroundings like the freezing water. Discover why touching the beaker feels cold and learn about heat transfer in such chemical reactions. This video is an insightful demonstration of heat absorption in chemical reactions.

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Questions & Answers

QUESTION:

You mix solid hydrated barium hydroxide, \(\mathrm{Ba}{(\mathrm{OH})_2}\cdot8{\mathrm{H}_2}\mathrm{O}\left( s \right)\), and solid ammonium nitrate, \(2\mathrm{NH}_4\mathrm{NO}_3\left( s \right)\), in a beaker. The reaction is shown here. A small pool of water in contact with the outside of the beaker freezes.

\(\mathrm{Ba}{(\mathrm{OH})_2}\cdot8{\mathrm{H}_2}\mathrm{O}\left( s \right)+2\mathrm{NH}_4\mathrm{NO}_3\left( s \right)\rightarrow2\mathrm{NH}_3\left( g \right)+10\mathrm{H}_2\mathrm{O}\left( l \right)+\mathrm{Ba}(\mathrm{NO}_3)_2\left( aq \right)\)

a. List all the substances that are part of the system.

b. List at least four objects that are part of the surroundings.

c. Which is at a lower temperature: \(\mathrm{NH}_4\mathrm{NO}_3\left( s \right)\) or \(\mathrm{Ba}(\mathrm{NO}_3)_2\left( aq \right)\)? Explain your thinking.

d. What will you feel if you touch the beaker?

e. Is the reaction endothermic or exothermic? Explain your thinking.

f. What evidence do you have that heat is transferred from the surroundings to the products of the reaction?

ANSWER:

Step 1 of 6

(a)

The substances that are part of the system are provided below:

1. Solid hydrated barium hydroxide \(\rm{Ba(OH)}_2\cdot8\rm{H}_2\rm{O}\)

2. Solid ammonium nitrate \(2\rm{NH}_4\rm{NO}_3\)

3. Gaseous ammonia \(\rm{NH}_3\)

4. Liquid water \(\rm{H}_2\rm{O}\)

5. Aqueous barium nitrate \(\rm{Ba(NO_3)}_2\)

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