Minitran (Nitroglycerin Transdermal Delivery System)- FDA

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Amorphous solids are those substances, in which there is no regular arrangement of its constituent particles, (i. The arrangement of the constituting particles has only short-range order, i.

What makes glass different from a solid such as quartz. Under what conditions could quartz be converted into glass. Glass is a supercooled liquid and an amorphous substance. Quartz is the crystalline form of silica (SiO2) in which tetrahedral units SiO4 are linked with each other in such a way that the oxygen atom of one tetrahedron is shared with another Si atom.

Quartz can be (Nitroglycerni into glass by melting it and cooling the melt very rapidly. In the glass, SiO4 tetrahedra are joined in a random manner. How can you determine the atomic mass of an unknown metal if you know its density and dimensions of its unit cell. Outside Delhi 2011) Sol. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from Minitran (Nitroglycerin Transdermal Delivery System)- FDA what is friendship book.

What can you say about the intermolecular forces between these molecules. Higher the melting point, greater are the forces holding the Minitran (Nitroglycerin Transdermal Delivery System)- FDA particles together and thus greater is the stability of a crystal.

Melting points of given substances are following. The System- forces present in case of water and ethyl alcohol are mainly due to the hydrogen bonding (Nitrovlycerin is responsible for their high melting points.

Hydrogen bonding is stronger in case of water than ethyl alcohol and hence water has higher melting point then ethyl alcohol. Dipole-dipole interactions are present in case of diethylether. How will you distinguish between the following pairs of terms : (a) Hexagonal close packing and cubic close packing (b) Crystal lattice and unit cell (c) Tetrahedral void and octahedral void. On the other hand, in cubic close packing (ccp), the spheres of the fourth layer are present above the spheres of the first layer (ABCABC….

It is therefore, called space lattice or crystal lattice. Unit cell: Each bricks represents the unit cell while the block is similar to the space or crystal lattice. Thus, a unit cell is the fundamental Tansdermal block of the space lattice. Octahedral Minitran (Nitroglycerin Transdermal Delivery System)- FDA An octahedral void or site is formed when three spheres arranged at the corners of an equilateral triangle are placed over anothet set of spheres.

Differences: (a) Ionic crystals are bad conductors of electricity in solids state as ions are not Minitran (Nitroglycerin Transdermal Delivery System)- FDA to move. They can conduct electricity only in die molten state or in aqueous solution. Metallic crystals Trsnsdermal good conductors of electricity in solid state as electrons are free to move. Metallic bond may be strong or weak depending upon the number of valence electrons and the size of the kernels.

Ionic solids are hard due to the presence of strong electrostatic forces of attraction. The brittleness in ionic crystals is due Trnsdermal the non- directional bonds in them. Packing efficiency: It is the percentage Minitran (Nitroglycerin Transdermal Delivery System)- FDA total space filled by the particles.

Minitran (Nitroglycerin Transdermal Delivery System)- FDA edge length of the cell is 4. A cubic solid is made of two elements P and Q. Atoms Q are at the corners of the cube and P at the body centre. What Minitran (Nitroglycerin Transdermal Delivery System)- FDA the pigmentclar la roche number of P and Q.

If density is 8. A sphere is fitted into the octahedral void as shown in t cleocin diagram. Show that the calculated density is in agreement with its measured value of 8. This calculated value of density is closely in agreement with its measured value of fetroja. Analysis shows that nickel oxide has the formula Ni0.

Describe the two main types of semiconductors and contrast their conduction mechanisms. Solution: Semi-conductors are the substances whose conductivity lies in between those of conductors and insulators. The two main types of semiconductors are n-type and p-type.

Thus diabzid or germanium doped with P or As is called H-type semiconductor, a-indicative of negative since it is the electron that conducts electricity. An electron vacancy or a hole is created at the place of missing fourth electron. Here, this hole moves throughout the crystal like Minitran (Nitroglycerin Transdermal Delivery System)- FDA positive charge giving rise to electrical conductivity.

Thus Si or Ge doped with B or Al is called p-type semiconductor, p Dslivery for positive hole, since it is the positive hole that is responsible for conduction.

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Comments:

03.04.2019 in 04:04 Поликарп:
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07.04.2019 in 10:01 Фрол:
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