A scientist heats a sample of a substance Q over a temperature range of -5° C to 87° C. He observes that the Substance Q Melt at 37° C and it boils at 69° C.
18. What is the freezing point (temperature) of the substance Q?
19. Which letter on the graph correspond to only solid state?
20. Which letter on the graph correspond to only liquid state?
21. Which letter on the graph correspond to only gas state?
22. Does the temperature increase during boiling?
