Molecular Theory of Matter
Molecular Theory of Matter: Overview
This topic explains the kinetic theory of matter. We will study the main postulates of this theory regarding the motion of the particles. We also learn that the kinetic theory explains the difference between the three states of matter.
Important Questions on Molecular Theory of Matter
According to the molecular model, sublimation is the process by which a substance directly changes from the liquid state to its vapour (gaseous) state on heating without passing through the solid state.
Some solids can directly change into the gaseous state without passing through the liquid state. Do you agree with the statement? Justify your answer.
Explain the process of sublimation by molecular model.
According to the molecular model, when a liquid is cooled, its molecules gain more kinetic energy.
When a liquid is heated, the intermolecular space between its molecules decreases.
Explain the process of vaporization by molecular model.
According to the molecular model, when a solid is heated, the particles are given more pressure and start to vibrate faster.
According to the molecular model, when a solid is heated, the intermolecular space between its molecules decreases.
Explain the process of melting by molecular model.
According to the kinetic theory of matter, molecules are always in a state of rest.
According to kinetic theory of matter, the molecules attract one another with a force which increases as the distance between them increases.
State the assumptions of the kinetic theory of matter.
A beaker is filled completely with water at Identify the incorrect statement:
Energy is transferred from one particle to another when they:
In which state of matter do molecules possess a high level of kinetic energy?
