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Any substance that has mass and occupies space.
Matter
Matter is made up of extremely small particles known as ...................
Molecules
Three states of matter
solid ,liquid and gas
Describe solid molecules in terms of particle arrangement
Molecules are tightly packed Strong intermolecular force of attraction Very less intermolecular space Molecules move about their fixed position
Describe liquid molecules in terms of particle arrangement
Molecules are loosely packed Weak intermolecular force of attraction More intermolecular space between molecules Molecules in contact and slide over each other
Describe gas molecules in terms of particle arrangement
Molecules are very loosely packed Very weak intermolecular force of attraction Vast intermolecular space between molecules Molecules move in all directions
The process by which liquid turns into gas on heating
Evaporation
The process in which gas changes into liquid on cooling
Condensation
The process in which solid changes into liquid on heating
Melting
The process in which liquid changes into solid on cooling
Freezing
The process of transformation of a liquid to a solid at room temperature.
Solidification
Two examples of substances that solidify
ghee, butter, wax
The process of solid directly changing into a gas without passing through the liquid phase
sublimation
Two substances that sublime
solid carbon dioxide (dry ice), iodine, camphor, naphthalene.
The increase in size of matter on heating is known as
Expansion
The decrease in size of matter on cooling is known as
Contraction
