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.) The temperature of the water bath is monitored, and it is determined from this data that 328. kJ of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 384. kJ of work on 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 reaction absorb or release energy? оо exothermic endothermic up down. neither. in out neither absorb release neither X S

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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### Understanding Endothermic and Exothermic Reactions

In this exercise, we explore the concepts of endothermic and exothermic reactions through an experimental setup involving a mixture of gaseous reactants in a cylinder. The cylinder has a piston that can move to maintain a constant pressure of 1 atmosphere. This cylinder is also submerged in a large insulated water bath.

#### Description of the Experimental Setup
- **Cylinder with Gaseous Reactants**: The mixture of gaseous reactants undergoes a chemical reaction, resulting in gaseous products. This reaction occurs inside the cylinder.
- **Piston Mechanism**: The cylinder is equipped with a piston that can move in or out to maintain a constant pressure.
- **Insulated Water Bath**: The cylinder is submerged in a large insulated water bath to monitor temperature changes.

#### Data Monitoring
- **Heat Flow**: It is determined that 328 kJ of heat flows out of the system during the reaction.
- **Piston Movement and Work Done**: The piston movement is monitored, and it is determined that the piston does 384 kJ of work on the system during the reaction.

#### Questionnaire
1. **Is the reaction exothermic or endothermic?**
   - Options: Exothermic, Endothermic

2. **Does the temperature of the water bath go up or down?**
   - Options: Up, Down, Neither
  
3. **Does the piston move in or out?**
   - Options: In, Out, Neither
  
4. **Does the reaction absorb or release energy?**
   - Options: Absorb, Release, Neither

Using the given data, learners are prompted to determine the nature of the reaction and its effects on the water bath temperature, piston movement, and energy absorption or release. This exercise helps reinforce the principles of thermodynamics and chemical reactions in an interactive format.
Transcribed Image Text:### Understanding Endothermic and Exothermic Reactions In this exercise, we explore the concepts of endothermic and exothermic reactions through an experimental setup involving a mixture of gaseous reactants in a cylinder. The cylinder has a piston that can move to maintain a constant pressure of 1 atmosphere. This cylinder is also submerged in a large insulated water bath. #### Description of the Experimental Setup - **Cylinder with Gaseous Reactants**: The mixture of gaseous reactants undergoes a chemical reaction, resulting in gaseous products. This reaction occurs inside the cylinder. - **Piston Mechanism**: The cylinder is equipped with a piston that can move in or out to maintain a constant pressure. - **Insulated Water Bath**: The cylinder is submerged in a large insulated water bath to monitor temperature changes. #### Data Monitoring - **Heat Flow**: It is determined that 328 kJ of heat flows out of the system during the reaction. - **Piston Movement and Work Done**: The piston movement is monitored, and it is determined that the piston does 384 kJ of work on the system during the reaction. #### Questionnaire 1. **Is the reaction exothermic or endothermic?** - Options: Exothermic, Endothermic 2. **Does the temperature of the water bath go up or down?** - Options: Up, Down, Neither 3. **Does the piston move in or out?** - Options: In, Out, Neither 4. **Does the reaction absorb or release energy?** - Options: Absorb, Release, Neither Using the given data, learners are prompted to determine the nature of the reaction and its effects on the water bath temperature, piston movement, and energy absorption or release. This exercise helps reinforce the principles of thermodynamics and chemical reactions in an interactive format.
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