The heating curve shown was generated by measuring the heat flow and temperature for a sample of ice as it was heated. The heat flow into the sample in the segment will yield the value of the AHvap of this sample. Heating curve for 1.00 mol of ice at -25°C 125 F Water vapor D 100 Liquid water and vapor (vaporization) 75 50 Liquid water 25 в с Ice and liquid water (melting) Ice A -25 Heat added (each division corresponds to 4 kJ) Select one: O a. DE O b. AB О с. ВС O d. CD Temperature (°C)

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**Heating Curve of Ice**

The heating curve shown was generated by measuring the heat flow and temperature for a sample of ice as it was heated. The heat flow into the sample in the _______ segment will yield the value of the ΔH<sub>vap</sub> of this sample.

### Heating Curve for 1.00 mol of Ice at -25°C

This is a graphical representation of the temperature changes that occur as 1.00 mol of ice is heated from -25°C through its phase changes to water vapor.

![Heating Curve for Ice](#)

**Graph Details:**  
- **X-Axis:** Heat added (each division corresponds to 4 kJ)
- **Y-Axis:** Temperature (°C)
  
**Phase Descriptions:**
1. **Segment A-B** 
   - Ice is being heated from -25°C to 0°C.
   - Temperature increases as heat is added.

2. **Segment B-C**
   - Phase change from ice to liquid water (melting).
   - Temperature remains constant as heat is added.

3. **Segment C-D**
   - Liquid water is being heated from 0°C to 100°C.
   - Temperature increases as heat is added.

4. **Segment D-E**
   - Phase change from liquid water to water vapor (vaporization).
   - Temperature remains constant as heat is added.

5. **Segment E-F**
   - Water vapor is being heated above 100°C.
   - Temperature increases as heat is added.

**Question:**
Select one:
- a. DE
- b. AB
- c. BC
- d. CD

**Correct Answer:**
- a. DE (represents the segment where the phase change from liquid water to water vapor occurs, thereby yielding the value of ΔH<sub>vap</sub>).

This graphic helps students understand how the addition of heat affects the temperature and phase of a substance, specifically ice in this case.
Transcribed Image Text:**Heating Curve of Ice** The heating curve shown was generated by measuring the heat flow and temperature for a sample of ice as it was heated. The heat flow into the sample in the _______ segment will yield the value of the ΔH<sub>vap</sub> of this sample. ### Heating Curve for 1.00 mol of Ice at -25°C This is a graphical representation of the temperature changes that occur as 1.00 mol of ice is heated from -25°C through its phase changes to water vapor. ![Heating Curve for Ice](#) **Graph Details:** - **X-Axis:** Heat added (each division corresponds to 4 kJ) - **Y-Axis:** Temperature (°C) **Phase Descriptions:** 1. **Segment A-B** - Ice is being heated from -25°C to 0°C. - Temperature increases as heat is added. 2. **Segment B-C** - Phase change from ice to liquid water (melting). - Temperature remains constant as heat is added. 3. **Segment C-D** - Liquid water is being heated from 0°C to 100°C. - Temperature increases as heat is added. 4. **Segment D-E** - Phase change from liquid water to water vapor (vaporization). - Temperature remains constant as heat is added. 5. **Segment E-F** - Water vapor is being heated above 100°C. - Temperature increases as heat is added. **Question:** Select one: - a. DE - b. AB - c. BC - d. CD **Correct Answer:** - a. DE (represents the segment where the phase change from liquid water to water vapor occurs, thereby yielding the value of ΔH<sub>vap</sub>). This graphic helps students understand how the addition of heat affects the temperature and phase of a substance, specifically ice in this case.
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