### Identifying Phase Transitions on a Heating CurveA pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate, and the temperature is recorded as time passes. Below is a graph of the results:#### Graph Description:- **X-axis**: Heat added (kJ/mol)- **Y-axis**: Temperature (°C)- **Curve**: The graph shows an upward trend initially, indicating an increase in temperature as heat is added. It then becomes horizontal, indicating a phase change where temperature remains constant despite further heat addition. The curve resumes an upward trend once the phase change is complete.#### Use this graph to answer the following questions:1. **What is the melting point of X?** - [Input for numerical answer] °C2. **What phase (physical state) of X would you expect to find in the flask after 7 kJ/mol of heat has been added?** - [Checkboxes] - Solid - Liquid - Gas[Buttons for interaction]- Explanation- Check(Note: The graph illustrations make it clear that specific regions indicate different phases based on the heat added and the corresponding temperature changes.)---This educational content helps students understand how to interpret heating curves and identify phase transitions like melting points.

Answer:When we start heating a solid, it gains and its temperature starts rising up to its melting…

A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a graph of the results: 100 temperature (°C) 80. 60 40 20 0. -20. 40. 20 30 heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X? What phase (physical state) of X would you expect to find in the flask after 7 kJ/mol of heat has been added? (check all that apply) Osolid Oliquid Ogas X 40 5 50

A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a graph of the results: 100 temperature (°C) 80. 60 40 20 0. -20. 40. 20 30 heat added (kJ/mol) Use this graph to answer the following questions: What is the melting point of X? What phase (physical state) of X would you expect to find in the flask after 7 kJ/mol of heat has been added? (check all that apply) Osolid Oliquid Ogas X 40 5 50

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

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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.

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### Identifying Phase Transitions on a Heating Curve

A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate, and the temperature is recorded as time passes. Below is a graph of the results:

#### Graph Description:
- **X-axis**: Heat added (kJ/mol)
- **Y-axis**: Temperature (°C)
- **Curve**: The graph shows an upward trend initially, indicating an increase in temperature as heat is added. It then becomes horizontal, indicating a phase change where temperature remains constant despite further heat addition. The curve resumes an upward trend once the phase change is complete.

#### Use this graph to answer the following questions:

1. **What is the melting point of X?**
- [Input for numerical answer] °C

2. **What phase (physical state) of X would you expect to find in the flask after 7 kJ/mol of heat has been added?**
- [Checkboxes]
- Solid
- Liquid
- Gas

[Buttons for interaction]
- Explanation
- Check

(Note: The graph illustrations make it clear that specific regions indicate different phases based on the heat added and the corresponding temperature changes.)

---

This educational content helps students understand how to interpret heating curves and identify phase transitions like melting points.

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