The table below shows the melting and boiling points of three different substances.
What is the physical state of H, I and J at room temperature (25°C)?
Which substance diffuses the fastest at room temperature? Explain your answer.
Substance H. Because substance H exist as a gas at room temperature, hence there is a lot of empty space between the particles. Other than that, the particles of H have the highest kinetic energy.
What is the name of the process which atoms or molecules of a substance in liquid state gain sufficient energy to enter the gaseous state below boiling point?
Boiling Point is the temperature at which the pressure exerted by the surroundings upon a liquid is equalled by the pressure exerted by the vapour of the liquid.
Sketch the graph of temperature against time for substance I when it is cooled from 120°C to room temperature.