Question

in this graph, the substance initially starts out as a solid
at point a, the temperature of the substance is
at point b, the temperature of the substance is increasing during this timedecreasingstaying the same
at point c, the temperature of the substance is
at point d, the temperature of the substance is during this time
at point e, the temperature of the substance is

Explanation:

Step1: Analyze Phase Change Graph Basics

In a typical phase - change graph (temperature vs. time), when a substance is heating up (not at a phase - change plateau), the temperature increases. At phase - change points (like melting or boiling), the temperature stays the same while the phase changes. The initial state is solid, so we analyze each point:

Step2: Point A Analysis

Before any phase change (assuming a heating curve), as we add heat to a solid, its temperature increases. So at point A, the temperature of the substance is increasing.

Step3: Point B Analysis (assuming B is on a phase - change plateau)

During a phase change (e.g., melting or boiling), the temperature of the substance stays the same as the energy is used for the phase transition. If B is on a plateau (like the melting or boiling plateau), the temperature is staying the same.

Step4: Point C Analysis (assuming C is after a phase change and heating)

After a phase change (e.g., after melting to liquid or boiling to gas), if we continue to add heat, the temperature of the substance (now in a new phase) will increase.

Step5: Point D Analysis (assuming D is on another phase - change plateau)

If D is on a phase - change plateau (e.g., boiling if B was melting), the temperature stays the same as the substance changes phase (liquid to gas).

Step6: Point E Analysis (assuming E is after the last phase change)

After the final phase change (e.g., after boiling), if we continue to add heat, the temperature of the gaseous substance will increase.

Answer:

• At point A: increasing
• At point B: staying the same (assuming B is on a phase - change plateau)
• At point C: increasing (assuming C is after a phase change and heating)
• At point D: staying the same (assuming D is on a phase - change plateau)
• At point E: increasing (assuming E is after the last phase change)

(Note: The exact answers depend on the specific phase - change graph, but the above is based on the general principles of heating curves in thermodynamics, which is a part of Physics (Natural Science subfield).)