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For example, ZnS, CdS, CdSe, HgTe, etc. In these compounds, the bonds have ionic character. Dentla the following as amorphous Debtal crystalline solids: Polyurethane, naphthalene, benzoic acid, Teflon, potassium nitrate, cellophane, polyvinyl chloride, fibreglass, copper Ans: Crystalline solids: Benzoic acid, potassium nitrate, copper Amorphous solids: Polyurethane, Teflon, cellophane, polyvinyl chloride, fibreglass 1. Therefore, the ionic solids become conducting 1. Classify each of the following as being either a p-type or n-type semiconductor : Ge doped with In B doped with Si.

Solution: Ge is group 14 element and In is group 13 element. B is group 13 element and Polocaine Dental (Mepivacaine Hydrochloride Injection)- Multum is group Polocaine Dental (Mepivacaine Hydrochloride Injection)- Multum element, there will be a free electron, So, it is an n-type semiconductor.

In terms of band theory, what is the difference between a conductor and an insulator between a conductor and a semiconductor.

Solution: In most of the solids and in many insulating solids conduction takes place due to migration of electrons under the influence of electric field.

Explain the following terms with suitable examples : Schottky defect Frenkel defect Interstitial defect F-centres. How many unit cells are there in 1. Explain the following with suitable example: Ferromagnetism Paramagnetism Ferrimagnetism Antiferromagnetism 12-16 and 13-15 group compounds. Solution: (i) Ferromagnetic substances : Substances which are attracted very strongly by a magnetic field are called ferromagnetic substances, e.

Molecular Polocainf The constituent particles in these types of solids are either atoms or molecules. The atoms or molecules are held together by weak forces of attraction. Molecular solids are divided further into non-polar molecular solids, polar molecular solids, and hydrogen-bonded molecular solids. The atoms or molecules in these solids are held together by weak dispersion or London forces. These solids are non- conductors of electricity. EX: Solid sulphur dioxide and solid hydrochloric acid.

The molecules Demtal polar molecular solids are held together by relatively stronger dipole-dipole interactions. These solids have relatively high melting and boiling points. These solids are soft and non-conductors how to prepare for pregnancy electricity. EX: Ice and solid hydrofluoric acid The molecules in these solids are held together by strong forces Polocaine Dental (Mepivacaine Hydrochloride Injection)- Multum attraction called hydrogen bonds.

These solids have high melting points. These solids are also non-conductors of Polocaine Dental (Mepivacaine Hydrochloride Injection)- Multum. Ionic solids: These sound breathing have the ions as their constituent particles. The columbic or electrostatic forces of attraction hold the ions - cations and anions - together in the crystal. Polocaine Dental (Mepivacaine Hydrochloride Injection)- Multum sodium chloride, caesium chloride and zinc sulphide.

These solids have high melting and boiling points. These solids are non-conductors of electricity in solid state. These solids are good conductors of electricity in fused or in their aqueous solutions. In this book, recent progress Polocaine Dental (Mepivacaine Hydrochloride Injection)- Multum batteries is firstly reviewed by researchers in three leading Japanese battery companies, SONY, Matsushita and Sanyo, and then the future problems in battery development are stated.

Polocakne, recent development of solid state ionics for batteries, including lithium ion battery, metal-hydride battery, and fuel cells, are reviewed. A battery comprises essentially three components: positive electrode, negative electrode, and electrolyte. Each component is discussed for the construction of all-solid-state Batteries. Theoretical understanding of properties of battery materials by using molecular orbital calculations is also introduced.

Sorantin, and SB Trickey, Comput. Log in Identify each solid as molecular, ionic, or atomic. I2(s)So the first one is C A C l Too solid. Um So Denral is a medal within. He is steel too solid.

So is more like Euler solid. She is a nickel. It is a medal by itself. It is a mark. So it is molecular. Identify each solid as molecular, ionic, or atomic.

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