heating curve
1. what is the melting point of the substance?
2. what is the boiling point of the substance?
3. what is the freezing point of the substance?
4. label the line segment that represents a solid being heated a.
5. label the line segment that would represent a liquid being heated b.
6. label the line segment that would represent a gas being heated c.
7. label the line segment that would represent the melting of a solid d.
8. label the line segment that would represent a liquid freezing e.
9. label the line segment that would represent a liquid boiling f.
10. at which point(s) is energy changing but not temperature?
11. at which point(s) is energy and temperature both changing?
12. if the substance is cooled from 100° c to 70° c, what phase change, if any, will occur?
13. if the substance is heated from 40° c to 50° c, what phase change, if any, will occur?

Question

Accepted Answer

### Question 1: What is the melting point of the substance?
# Explanation:
## Step1: Recall melting point on heating curve
On a heating curve, the melting point is the temperature at which the substance changes from solid to liquid, corresponding to the horizontal segment (where temperature is constant while energy is added). From the graph, the first horizontal segment is at $ 60^\circ \text{C} $.
# Answer: $ 60^\circ \text{C} $

### Question 2: What is the boiling point of the substance?
# Explanation:
## Step1: Recall boiling point on heating curve
The boiling point is the temperature at which the substance changes from liquid to gas, shown by the second horizontal segment. From the graph, this segment is at $ 100^\circ \text{C} $ (assuming the middle horizontal is around 100, but from the graph's grid, the second flat part is at ~100? Wait, looking at the graph, the first flat is at 60, then rising to ~100 (maybe 95 - 100), then flat, then rising. Wait, the graph has the first horizontal at 60, then rising to a second horizontal (boiling) at around 100? Wait, the y - axis: 30, 60, 90, 120. The first flat is at 60, then rising to a flat at ~100 (maybe 95 - 100, but let's check the grid. The first horizontal segment (melting) is at 60°C. The second horizontal segment (boiling) is at 100°C? Wait, the graph: after 60, it rises to a flat part, maybe 100? Let's see, the y - axis: 30, 60, 90, 120. The first flat is at 60, then the line goes up to a flat at, say, 100 (since 90 is below, then a flat, then up). So boiling point is $ 100^\circ \text{C} $ (or the temperature of the second horizontal segment).
# Answer: $ 100^\circ \text{C} $ (or the temperature of the second horizontal segment, e.g., if the graph's second flat is at 100, as per typical heating curves for water - like substances, but from the graph, the second horizontal is at around 100? Wait, the graph shows: starting at 30, rising to 60 (flat), then rising to a flat (maybe 100), then rising. So boiling point is the temperature of the second horizontal segment, so $ 100^\circ \text{C} $ (assuming standard, or from the graph's grid, the second flat is at 100).

### Question 3: What is the freezing point of the substance?
# Explanation:
## Step1: Recall freezing point relation to melting point
Freezing point is the same as melting point for a substance (since melting and freezing are reverse processes at the same temperature). So if melting point is $ 60^\circ \text{C} $, freezing point is also $ 60^\circ \text{C} $.
# Answer: $ 60^\circ \text{C} $

### Question 4: Label the line segment that represents a solid being heated (a)
# Explanation:
## Step1: Identify solid heating segment
On a heating curve, the segment where the substance is a solid and temperature is rising (before melting) is the first sloped segment, from the start (30°C) to the melting point (60°C) horizontal segment. So the line from (energy, 30) to (energy at 60 flat start) is the solid heating segment.
# Answer: The sloped segment from the initial point (30°C, low energy) to the start of the first horizontal (melting) segment (60°C, energy where melting starts) is labeled 'a'.

### Question 5: Label the line segment that represents a liquid being heated (b)
# Explanation:
## Step1: Identify liquid heating segment
After melting (first horizontal), the substance is liquid, and the temperature rises until boiling. So the sloped segment between the first horizontal (melting end) and the second horizontal (boiling start) is the liquid heating segment.
# Answer: The sloped segment between the end of the first horizontal (melting) and the start of the second horizontal (boiling) is labeled 'b'.

### Question 6: Label the line segment that represents a gas being heated (c)
# Explanation:
## Step1: Identify gas heating segment
After boiling (second horizontal), the substance is gas, and the temperature rises. So the sloped segment after the second horizontal (boiling end) is the gas heating segment.
# Answer: The sloped segment after the end of the second horizontal (boiling) segment is labeled 'c'.

### Question 7: Label the line segment that represents the melting of a solid (d)
# Explanation:
## Step1: Identify melting segment
Melting is the phase change from solid to liquid, which occurs at constant temperature (horizontal segment). The first horizontal segment (where temperature is 60°C and energy is added) is the melting segment.
# Answer: The first horizontal segment (at 60°C, where temperature is constant as energy is added) is labeled 'd'.

### Question 8: Label the line segment that represents a liquid freezing (e)
# Explanation:
## Step1: Identify freezing segment
Freezing is the reverse of melting, so it occurs at the same temperature (60°C) and is a horizontal segment (but on a cooling curve, it's horizontal, but on this heating curve, the melting segment (first horizontal) is the reverse of freezing. So the first horizontal segment (melting) is the same as the freezing segment (since freezing is solidification at the same temperature).
# Answer: The first horizontal segment (at 60°C, same as melting) is labeled 'e' (since freezing is the reverse, same temperature, horizontal segment).

### Question 9: Label the line segment that represents a liquid boiling (f)
# Explanation:
## Step1: Identify boiling segment
Boiling is the phase change from liquid to gas, at constant temperature (horizontal segment). The second horizontal segment (where temperature is 100°C and energy is added) is the boiling segment.
# Answer: The second horizontal segment (at 100°C, where temperature is constant as energy is added) is labeled 'f'.

### Question 10: At which point(s) is energy changing but not temperature?
# Explanation:
## Step1: Recall phase change segments
During phase changes (melting, boiling), energy is added (or removed) but temperature remains constant. These are the horizontal segments on the heating curve. So the first horizontal (melting) and the second horizontal (boiling) segments have energy changing (increasing) but temperature constant.
# Answer: At the horizontal segments (melting: 60°C, boiling: 100°C), i.e., the first and second horizontal line segments.

### Question 11: At which point(s) is energy and temperature both changing?
# Explanation:
## Step1: Recall sloped segments
On a heating curve, the sloped segments (where temperature is rising as energy is added) are when the substance is in a single phase (solid, liquid, gas) and both energy and temperature are changing. So the three sloped segments: solid heating, liquid heating, gas heating.
# Answer: At the sloped segments (before melting, between melting and boiling, after boiling), i.e., the non - horizontal line segments.

### Question 12: If the substance is cooled from $ 100^\circ \text{C} $ to $ 70^\circ \text{C} $, what phase change, if any, will occur?
# Explanation:
## Step1: Recall boiling and condensation
The boiling point is around $ 100^\circ \text{C} $. When cooling from $ 100^\circ \text{C} $ (liquid - gas phase at boiling point) to $ 70^\circ \text{C} $, the substance is in the liquid phase (since $ 70^\circ \text{C} $ is below boiling point and above melting point). So as it cools from $ 100^\circ \text{C} $ (liquid, since at boiling point, liquid and gas coexist; cooling below boiling point, gas condenses to liquid, but once below boiling point, it's liquid. Wait, cooling from $ 100^\circ \text{C} $ (boiling point, liquid and gas) to $ 70^\circ \text{C} $: first, gas condenses to liquid (at $ 100^\circ \text{C} $ during cooling, but once below $ 100^\circ \text{C} $, it's liquid. But the temperature range from $ 100^\circ \text{C} $ to $ 70^\circ \text{C} $: the substance is liquid (since $ 70^\circ \text{C} $ is above melting point $ 60^\circ \text{C} $ and below boiling point $ 100^\circ \text{C} $). Wait, no: when cooling from $ 100^\circ \text{C} $ (boiling point, so liquid and gas) to $ 70^\circ \text{C} $, the phase change is condensation (gas to liquid) at $ 100^\circ \text{C} $, and then the liquid cools to $ 70^\circ \text{C} $. But the question is about the phase change when cooling from $ 100^\circ \text{C} $ to $ 70^\circ \text{C} $. The main phase change here is condensation (gas to liquid) as we cool below the boiling point.
# Answer: Condensation (gas changes to liquid) will occur as the substance cools from $ 100^\circ \text{C} $ (boiling point, gas - liquid mixture) to $ 70^\circ \text{C} $ (liquid).

### Question 13: If the substance is heated from $ 40^\circ \text{C} $ to $ 50^\circ \text{C} $, what phase change, if any, will occur?
# Explanation:
## Step1: Recall melting point
The melting point is $ 60^\circ \text{C} $. $ 40^\circ \text{C} $ and $ 50^\circ \text{C} $ are below the melting point ($ 60^\circ \text{C} $), so the substance is in the solid phase. Heating a solid below its melting point just increases its temperature (no phase change, since it's still solid).
# Answer: No phase change (the substance remains solid, only its temperature increases).

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QUESTION IMAGE

Question

Explanation:

Question 1: What is the melting point of the substance?

Step1: Recall melting point on heating curve

Step1: Recall boiling point on heating curve

Step1: Recall freezing point relation to melting point

Answer:

Question 2: What is the boiling point of the substance?