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Amorphous Solids
Amorphous Solids - Substances whose particles do not posses a regular orderly arrangement but have short range order. When amorphous solids are heated they become crystalline at some temperature. Properties of amorphous solids ar..
Amorphous Solids
Substances whose particles do not posses a regular orderly arrangement but have short range order. When amorphous solids are heated they become crystalline at some temperatur..
What happens when heat is taken away from substances?
When a liquid is cooled, the temperature of the liquid decreases. This means the liquid molecules move with lesser velocity. When the liquid is cooled further, the temperature decreases. At a certain stage the kinetic energy of the molecules become so less that intermolecular attraction dominates a..
Amorphous Carbon - Wood Charcoal
Wood charcoal is obtained by the destructive distillation of wood. The chief products formed are wood charcoal, wood tar, pyroligneous acid and wood gas (Fig.10.6). However, if wood charcoal is heated strongly, most of the air gets expelled and then if it is placed in water, it ..
Wood charcoal is obtained by the destructive distillation of wood. The chief products formed are wood charcoal, wood tar, pyroligneous acid and wood gas (Fig.10.6). However, if wood charcoal is heated strongly, most of the air gets expelled and then if it is placed in water, it ..Heating Effect of Electric Current
Energy exists in various forms such as mechanical energy, heat energy, chemical energy, electrical energy, light energy and nuclear energy. According to the law of conservation of energy, energy can be transformed from one form to another. In our daily life we use many devices where the e..
Hess's Law of Constant Heat Summation
Fig: 5.4 - Illustration of Hess's law This means that the amount of heat evolved or absorbed in a chemical reaction depends only upon the energy of initial reactants and the final products. The heat change is independent of the path or the manner in which the change has taken pl..
Fig: 5.4 - Illustration of Hess's law This means that the amount of heat evolved or absorbed in a chemical reaction depends only upon the energy of initial reactants and the final products. The heat change is independent of the path or the manner in which the change has taken pl..Solid-Liquid Equilibrium
When a solid is heated it starts melting at a certain fixed temperature (melting point). At this stage even when the heating is continued, the temperature does not change until the whole of solid is converted into liquid. The state when solid and li..
When a solid is heated it starts melting at a certain fixed temperature (melting point). At this stage even when the heating is continued, the temperature does not change until the whole of solid is converted into liquid. The state when solid and li..(v) Combination of oppositely charged gaseous ions to form solid crystal
This involves the release of energy referred as lattice energy (U). The various energy changes in different steps are as shown: Born Haber Cycle for NaCl The sum of the energy changes taking place during various steps is equal to D H f i.e., heat of formation of NaCl ( s ) ..
This involves the release of energy referred as lattice energy (U). The various energy changes in different steps are as shown: Born Haber Cycle for NaCl The sum of the energy changes taking place during various steps is equal to D H f i.e., heat of formation of NaCl ( s ) ..Gaseous state
A gas neither possesses a definite volume nor a definite shape. The substances in a gas have particles that are separated by great distance, having virtually no force of attraction between them. A gas occupies the whole of the volume of the vessel in which it is placed. It also takes up the shape ..
Sublimation
This method is used to separate volatile solids, from a non-volatile solid. The mixture is taken in a china dish covered with a perforated filter paper on which an inverted glass funnel is placed to collect the vapours. Upon heating, the substance vapourizes and ..
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