A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to absorb 176. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 377. kJ of heat flows out of the system during the reaction. Is the reaction exothermic or endothermic? Does the temperature of the water bath go up or down? Does the piston move in or out? Does the gas mixture do work, or is work done on it? How much work is done on (or by) the gas mixture? Round your answer to 3 significant digits. Explanation Check exothermic endothermic up down neither in out Oneither does work work is done on it Oneither 1 atm pressure gases piston cylinder 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Ce

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to absorb 176. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 377. kJ of heat flows out of the system during the reaction. Is the reaction exothermic or endothermic? Does the temperature of the water bath go up or down? Does the piston move in or out? Does the gas mixture do work, or is work done on it? How much work is done on (or by) the gas mixture? Round your answer to 3 significant digits. Explanation Check exothermic endothermic up down neither in out Oneither does work work is done on it Oneither 1 atm pressure gases piston cylinder 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Ce

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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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

100%

**Thermochemistry**

**Understanding the Definitions of Heat and Work**

The temperature of the water bath is monitored, and it is determined from this data that 377 kJ of heat flows out of the system during the reaction.

1. **Is the reaction exothermic or endothermic?**
- [ ] Exothermic
- [ ] Endothermic

2. **Does the temperature of the water bath go up or down?**
- [ ] Up
- [ ] Down
- [ ] Neither

3. **Does the piston move in or out?**
- [ ] In
- [ ] Out
- [ ] Neither

4. **Does the gas mixture do work, or is work done on it?**
- [ ] Does work
- [ ] Work is done on it
- [ ] Neither

5. **How much work is done on (or by) the gas mixture? Round your answer to 3 significant digits.**
- [ ] ____ kJ

**Buttons:**
- Explanation
- Check

**Understanding the Definitions of Heat and Work**

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath.

From previous experiments, this chemical reaction is known to absorb 176 kJ of energy.

The temperature of the water bath is monitored, and it is determined from this data that 377 kJ of heat flows out of the system during the reaction.

### Questions

1. **Is the reaction exothermic or endothermic?**
- [ ] exothermic
- [x] endothermic

2. **Does the temperature of the water bath go up or down?**
- [x] up
- [ ] down
- [ ] neither

3. **Does the piston move in or out?**
- [ ] in
- [x] out
- [ ] neither

4. **Does the gas mixture do work, or is work done on it?**
- [x] does work
- [ ] work is done on it
- [ ] neither

5. **How much work is done (on or by) the gas mixture? Round your answer to 3 significant digits.**
- \( \Box \) kJ

### Diagram

The diagram illustrates a cylinder submerged in a water bath. The cylinder contains gases and has a piston on top. Labels indicate:
- Pressure maintained at 1 atm
- The cylinder and gases inside
- The water bath surrounding the cylinder

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