FSC Chemistry Chapter 4 | 1st Year

FSC Chemistry Chapter 4 | 1st Year

FSC Chemistry Chapter 4 | 1st Year



                            Chapter four Notes | Chemistry first Year

“Liquids And Solids”
Index:
Intermolecular Forces
Evaporation
Liquid Crystals
Solids
Crystal Lattice
Crystals And Their Classification
Classification of Solids
Determination of Avogadro’s range
Key Points:
Among 3 states of matter i.e. gases, liquids and solids, the building block enticing forces within the gases square measure negligible. In liquids building block forces square measure sturdy enough to stay the molecules approximate. Anyhow, the molecules in liquids square measure unengaged to move with relevance each other.
There square measure four varieties of building block forces i.e. dipole-dipole forces, London dispersion forces, atomic number 1 bonding and Ion-dipole forces. The relative strenghts of sipole-dipole and dispersion forces rely upon the polarity, polarisability, size and form of the molecules.
The force per unit area of a liquid measures the tendency of a liquid to evaporate. it's the pressure exerted by the vapours on the surface of a liquid once the speed of evaporation is adequate the speed of condensation.
Many crystalline solids soften to relinquish a murky liquid before melting to relinquish a transparent liquid. These murky liquids possess some extent of order and care known as liquid crystals.
In crystalline solids the particles square measure organized during a regular and continuation manner. The essential structural options of a crystalline solid is diagrammatical by its building block. The 3 dimensional array of points representing atoms, ions or molecules is termed space lattice.
The simplest building block may be a isometric building block. There square measure seven crystal systems overall.
The properties of solids rely on the arrangement of particles and also the enticing forces b/w them. Ionic solids square measure laborious and brittle and have high melting points. valency solids carries with it atoms control along by valency bonds and these bonds extend throughout the solid.





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