The answers to these questions are given below.
The graph shows that the substance is initially in a gaseous state.
The substance begins to condense at minute 1.
The condensation process is complete at minute 4.
The substance remains in a liquid state from minutes 4 to 6.
The substance begins to solidify at minute 6.
The solidification process is complete at minute 7.
16. Heat is being removed from the substance, as the temperature is decreasing.
17. Segment m represents the point during which the gas is turning into a liquid (g→l). This is because the substance is releasing heat (exothermic process) as it condenses from a gas to a liquid.
18. Segment s represents the point during which the liquid is turning into a solid (l→s). This is because the substance is releasing heat (exothermic process) as it solidifies from a liquid to a solid.
19. The term for what the substance is doing between minutes 1 and 3 is condensation. Condensation is the process by which a gas changes into a liquid.
20. The state of matter that the substance is in at the end of segment b (just before the beginning of segment c) is liquid.
21. The state of matter that the substance is in during segment a is gas.
22. The state of matter that the substance is in during segment c is liquid.
23. It took 3 minutes for the substance to condense completely (from the beginning of the condensation process to the end).
24. True, This graph likely represents a cooling curve for water. Water is a common substance that is used to create cooling curves.
25. The term for what the substance is doing between minutes 6 and 7 is solidification. Solidification is the process by which a liquid changes into a solid.