Liquid gasoline at 30 degrees Celsius is heated until it begins to boil at 110 degrees Celsius.
What happens to the temperature at first?
What sort of energy (kinetic or potential) is the gasoline acquiring at first? What is the evidence?
What happens to the temperature once the gasoline starts to boil?
What sort of energy is the gasoline acquiring during this the boiling stage?
Draw a heating curve (temperature on the y-axes and time on the x-axes) for the heating of gasoline from 30oC until it boils for a while at 110oC. Label the temperature axis with an appropriate scale. There in no need to put specific times on the time axis. Indicate which phase the gasoline is in (solid, liquid, or gas) for each portion of the heating curve.
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When the gasoline is initially heated, the temperature is 30 degrees Celsius. The molecules of gasoline start to vibrate with more energy, as they are absorbing the heat from the heat source. The temperature starts to climb slowly, indicating this acquisition of energy, which results in increased kinetic energy amongst the molecules. When the gasoline starts to boil at 110 degrees Celsius, the kinetic energy is at its maximum and the molecules overcome their liquid state of matter and pass to the gaseous state of matter. As long as there is liquid, the temperature will remain at 110, but will continue to rise once all the gasoline is in gaseous form, indicating heightened kinetic energy of gasoline in the gaseous state. Construction of the graph should be simple, indicating a direct relationship, climbing 45 degree-like curve, between the amount of time and the temperature, which is indicating the kinetic energy of the molecules.
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