Question

Consider the temperature versus time graph below.

A graph of temperature versus time has time on the horizontal axis and temperature in degrees Celsius from negative 20 to 140 on the vertical axis. A line extends through the following points: 0, negative 10; 4, 0; 7, 140; 18, 120; 19, 125.
At what temperature is the boiling point of this substance?
at 0°C
between 0°C and 100°C
at 120°C
above 120°C

Answer 1

The boiling point of water is 100°C at standard atmospheric pressure. Since the graph shows the temperature reaching 140°C, it is above the boiling point of water. Therefore, the boiling point of this substance is above 120°C.