Question

read the passage to help you answer the questions!! in this graph, the substance initially starts out as a solid. at point a, the temperature of the substance is staying the same. at point b, the temperature of the substance is staying the same. during this time, the substance changes from a solid -> liquid. at point c, the temperature of the substance is increasing. at point d, the temperature of the substance is staying the same. during this time, the substance changes from a liquid -> gas. at point e, the temperature of the substance is increasing.

Explanation:

Step1: Analyze Point A

The graph at point A shows a rising line (positive slope), so temperature should be increasing, not staying the same. Correct: increasing.

Step2: Analyze Point B

Point B is on a horizontal segment (phase change: melting, solid to liquid). Temperature stays constant here, which matches the given, but let's confirm. The horizontal line means no temp change during phase transition (solid→liquid), so "staying the same" is correct.

Step3: Analyze Point C

Point C is on a rising segment (after melting, liquid heating). Temperature is increasing, which matches the given.

Step4: Analyze Point D

Point D is on a horizontal segment (boiling, liquid→gas). Temperature stays constant, which matches the given.

Step5: Analyze Point E

Point E is on a rising segment (gas heating). Temperature is increasing, which matches the given.

Initial State

Substance starts as solid (correct, since initial temp is low, below melting point, so solid).

Answer:

• Initial state: solid (correct)
• Point A: increasing (correction from "staying the same")
• Point B: staying the same (correct), phase change: solid → liquid (correct)
• Point C: increasing (correct)
• Point D: staying the same (correct), phase change: liquid → gas (correct)
• Point E: increasing (correct)

(Note: The error was at Point A; the rest were correct. If the question was about correcting Point A, the answer for Point A's temperature is "increasing".)