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✏️why metals are good conductor of heat and electricity whereas non metals are not?
✏️️Is milk a pure substance ?✏️write few applications of crystalline process?
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preetdhami:
they are good conductor of heat and electricity because they have free electrons in their outermost shell,milk is not a pure substance because pure substance is made up only one type of components and milk is made from many other components
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1ANS)Mextals are good conductor of heat because they have free electrons in the outer shell of the atoms which are not tightly bound to their atoms and are free to transport heat energy. In simple words, non metals do not have free electron to conduct electricity.But if we talk about the energy band theory, conduction band and valence band,Non metals have completely filled valence band and there is no electron in the conduction band, thats why they are bad conductos.Also the energy gap between velance band and conduction band is much higher about 5Mev to transfer electron from valence to conduction band, which is a large amout of energy.Thats why they are bad conductors.
2ANS)Milk is a complex blend of water, carbohydrates, fats, proteins and many other components such as calcium-containing compounds. There are various grades of milk. Thus it is a mixture Not a pure substance.
3ANS)The applications of the crystallization technique in the pharmaceutical industry as a purification and separation process for the isolation and synthesis of pure active pharmaceutical ingredients (API), co-crystals, controlled release pulmonary drug delivery, and separation of chiral isomers are briefly discussed using a few case studies. The effect of process variables and solvent on the polymorphism and morphology of stavudine is discussed. The implementation of external control in the form of feedback and real-time optimal control using cooling and antisolvent crystallization of paracetamol in water-isopropyl alcohol is introduced. Two methods to prepare micronsized drug particles, namely, micro-crystallization and polymer-coated API-loaded magnetic nanoparticles for pulmonary drug delivery, are discussed. The significance of co-crystals in drug administration is highlighted using the theophylline-nicotinamide co-crystal system. Resolution of chloromandelic acid derivatives, a racemic compound, is achieved using direct crystallization and diastereomeric salts crystallization. The crystal structures of diastereomeric salts of chloromandelic acid and phenylethylamine are determined. The structure comparison between the less soluble and more soluble salts shows that weak interactions such as CH/π interactions and van der Waals forces contribute to chiral recognition when the hydrogen bonding patterns are similar.
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Milk is not a pure substance as it doesnt have a fixed composition of carbohydrates, fats, protiens etc. And metals are good conductor of heat as they can trasfer heat whereas non metals cannot.
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