changes
part a
during the condensation phase on the graph, the temperature
select one
part b
which letters on the graph represent freezing?
a c-d
b d-e
c e-f
d b-c
e a-b
part c
the graph above is a select one curve.
energy(heat) is select one .
part d
the melting point is
the condensation point is
(graph: x-axis time (min), y-axis temperature with points a-f)

Question

Accepted Answer

### Part A
# Brief Explanations:
During condensation (a phase change from gas to liquid), the temperature remains constant (latent heat is involved, so temperature doesn't change while phase changes).
# Answer:
remains constant

### Part B
# Brief Explanations:
Freezing is the phase change from liquid to solid, which occurs at a constant temperature (a horizontal segment on the cooling curve). The segment D - E is horizontal, representing constant temperature during freezing (liquid to solid).
# Answer:
B. D - E

### Part C
# Brief Explanations:
The graph shows temperature vs. time during cooling (temperature decreases over time), so it's a **cooling** curve. In a cooling curve, energy (heat) is **released** (as the substance cools, it loses heat energy).
# Answers:
The graph above is a \boxed{cooling} curve.
Energy(heat) is \boxed{released}.

### Part D
# Explanation:
## Step 1: Find Melting Point
Melting point is the temperature at which a solid melts to liquid, which is the same as the freezing point (horizontal segment during phase change). The horizontal segment B - C (or D - E, since melting and freezing points are equal) has a temperature of $ 160^\circ \text{C} $? Wait, no, looking at the graph: B is at 2 min, temperature $ 160^\circ \text{C} $? Wait, the y - axis: at B (2 min) and C (6 min), the temperature is $ 160^\circ \text{C} $? Wait, no, the dashed line at B is at $ 160^\circ \text{C} $? Wait, the y - axis labels: 160, 140, 120, 100, 80, 60, 40, 20. Wait, at B (2 min) and C (6 min), the temperature is $ 160^\circ \text{C} $? Wait, no, the first horizontal segment (B - C) is for condensation? No, wait, the graph is a cooling curve. Let's re - analyze:

- A - B: gas cooling (temperature decreasing)
- B - C: condensation (gas to liquid, constant temperature)
- C - D: liquid cooling (temperature decreasing)
- D - E: freezing (liquid to solid, constant temperature)
- E - F: solid cooling (temperature decreasing)

Melting point is the temperature at which solid melts to liquid, which is equal to the freezing point (D - E segment temperature). The D - E segment is at $ 100^\circ \text{C} $ (dashed line at D and E is at $ 100^\circ \text{C} $)? Wait, no, the y - axis: at D (12 min) and E (14 min), the temperature is $ 100^\circ \text{C} $? Wait, the first horizontal segment (B - C) is at $ 160^\circ \text{C} $ (B at 2 min, C at 6 min, temperature $ 160^\circ \text{C} $)? Wait, maybe I misread. Let's check the y - axis: the first point A is at (0, 220), B at (2, 160), C at (6, 160), D at (12, 100), E at (14, 100), F at (16, 60).

So:

- Melting point: The temperature at which solid melts to liquid, which is the same as the freezing point (the temperature during the freezing phase, D - E). The D - E segment is at $ 100^\circ \text{C} $? Wait, no, freezing is liquid to solid, so the temperature during D - E is the freezing point (and also melting point). Wait, B - C is condensation (gas to liquid), so the temperature during B - C is the condensation point (and also boiling point).

So:

- Melting point: The temperature at which solid melts to liquid, which is the same as the freezing point. The freezing occurs at D - E, where temperature is $ 100^\circ \text{C} $? Wait, no, the y - axis at D and E is at $ 100^\circ \text{C} $? Wait, the dashed line at D is at $ 100^\circ \text{C} $, yes. So melting point is $ 100^\circ \text{C} $? Wait, no, maybe B - C is boiling (liquid to gas) but in a cooling curve, B - C is condensation (gas to liquid), so the temperature at B - C is the condensation point (equal to boiling point). So:

## Step 1: Melting Point
Melting point is the temperature at which solid changes to liquid, which is the same as the freezing point (the temperature during the freezing phase, D - E). From the graph, D - E is at $ 100^\circ \text{C} $ (the horizontal segment D - E has temperature $ 100^\circ \text{C} $).

## Step 2: Condensation Point
Condensation point is the temperature at which gas changes to liquid, which is the same as the boiling point (the temperature during the condensation phase, B - C). From the graph, B - C is at $ 160^\circ \text{C} $ (the horizontal segment B - C has temperature $ 160^\circ \text{C} $).

# Answers:
The melting point is $\boxed{100^\circ \text{C}}$
The condensation point is $\boxed{160^\circ \text{C}}$

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Part A

Answer:

Part B