Question

Question was provided via image upload.

Explanation:

Identify the missing context

The image asks to complete statements by writing numbers from a graph, but the graph itself is missing from the image. However, this is a standard heating curve problem for a pure substance. Let's reconstruct the standard 5-region heating curve:

• Region 1 (diagonal rising): Solid phase only.
• Region 2 (horizontal plateau): Solid and liquid phase coexistence (melting/freezing). The temperature at this plateau is the melting point.
• Region 3 (diagonal rising): Liquid phase only.
• Region 4 (horizontal plateau): Liquid and gas phase coexistence (boiling/condensation). The temperature at this plateau is the boiling point.
• Region 5 (diagonal rising): Gas phase only.

Match statements to standard regions

Using the standard 5-region heating curve labeling:

• "The substance is in the gas phase only in region": This corresponds to the final rising section, which is Region 5.
• "The substance is in both the liquid and the solid phase in region": This corresponds to the first plateau (melting), which is Region 2.
• "The substance is in only the liquid phase in region": This corresponds to the middle rising section, which is Region 3.
• "The melting point is the temperature at region": This corresponds to the first plateau, which is Region 2.
• "The boiling point is the temperature at region": This corresponds to the second plateau, which is Region 4.

Apply student profile concepts

We apply the student's mastered concept of States of Matter to identify how kinetic energy and phase transitions correspond to the plateaus and slopes of a heating curve.

• Slopes represent single phases where temperature (kinetic energy) increases: solid (Region 1), liquid (Region 3), and gas (Region 5).
• Plateaus represent phase changes where potential energy increases at constant temperature: solid-liquid coexistence (Region 2) and liquid-gas coexistence (Region 4).

Answer:

Complete the statements by writing the number from the graph.

The substance is in the gas phase only in region <blank>5</blank>.

The substance is in both the liquid and the solid phase in region <blank>2</blank>.

The substance is in only the liquid phase in region <blank>3</blank>.

The melting point is the temperature at region <blank>2</blank>.

The boiling point is the temperature at region <blank>4</blank>.