UHS MDCAT Past Papers 2008 with Keys | Pdf Download

 

In this post, students can download UHS MDCAT Past Papers 2008 with Keys pdf form.  We are working very hard day and night to provide the best study materials for students of all levels. We want everyone to have access to free knowledge. In this post, we have provided the old past papers of the UHS Mdcat test of 2008.

In chemistry, the solid and constituent particles are arranged in three dimensions and have a geometrical shape called crystalline solids. There are four types of crystalline solid ionic crystals, covalent crystals, metallic crystals, and Molecular crystals. The crystalline solids in which the constituent particles are held together by strong Olympic electrostatic force of attraction are called ionic crystals.

The constituent particles of ionic crystals are oppositely charged ions that are anions and cations. Ionic crystals have a very high melting and boiling point. They have a very high heat of fusion. They are soluble in toilet solvents like water that are insoluble and nonpolar solvents like benzene at 17. 

The crystalline solids in which the constituent particles are held together by the covalent bond are called covalent crystals. The constituent particles of these crystals are agents which are attached to adjacent atoms by a covalent bond; they are also known as atomic solids. examples of solids are diamond, graphite, and Boron nitride. 

 Metallic crystals are those kinds of solids in which the constituent particles are held together by a special type of bonding called metallic bonding. The first theory of metallic bonding is called the electron pool or electron gas theory.

According to this theory, the electrons in the outermost orbitals of the metal atoms are generally very loosely bound and can be free from one place to another inside the metallic crystal Lattice are called conduction electrons or free electrons. These free electrons are uniformly distributed throughout the metal lattice the metallic bonding using these conduction electrons are transformed into positive ions. The Columbia interaction between the positive and the negative electron arises which is called a metallic bond. 

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