KPK 11th Class Chemistry Chapter 6 States of matter-II Solids Short Questions Answers
KPK 11th Class Chemistry Chapter 6 States of matter-II Solids Short Questions with answers are combined for all 11th class(Intermediate/hssc) Level students.Here You can prepare all Chemistry Chapter 6 States of matter-II Solids short question in unique way and also attempt quiz related to this chapter. Just Click on Short Question and below Answer automatically shown. After each question you can give like/dislike to tell other students how its useful for each.
Class/Subject: 11th Class Chemistry
Chapter Name: States of matter-II Solids
Board: All KPK Boards
- Malakand Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Mardan Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Peshawar Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Swat Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Dera Ismail Khan Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Kohat Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Abbottabad Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
- Bannu Board 11th Class Chemistry Chapter 6 States of matter-II Solids short questions Answer
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KPK 11th Class Chemistry Chapter 6 States of matter-II Solids Short Questions Answers
It is the smallest repeating unity of a crystal lattice, showing all the characteristics of its this unity in three dimension. These six parameters i.e three edges and three angles of the unity cell are called unity cell dimensions or crystallographic elements of a unity cell. If a crystal can be divided by an imaginary plane into two equal halves such that one half is the exact mirror image of the other, it is said to have plane of symmetry. Centre of symmetry Centre of symmetry is a point at the centre crystal which is equidistant from two opposite faces of a crystal. It must be noted that a crystal may have a number of planes of symmetry or axis of symmetry but it can have only one centre of symmetry. Axis of symmetry It is an imaginary line drawn through the crystal such that rotating the crystal through 360°. The crystal presents exactly the same appearance more than once. Crystalline solids: These are true solids in which constituent particles (atoms, ions or molecules) are arranged in three dimensions having characteristic geometry. Diamond, sodium chloride are the examples of crystalline solids. Hence they have right and definite geometrical shapes. They are also called true solids. Most of the solids are crystalline in nature. Examples of such solids are sodium chloride (NaCL) calcium carbonate (CaCO3), Calcium oxide (CaO), Diamond graphite etc. Amorphous solids (Non-crystalline solids) These solids in which the ions, molecules or atoms have a random or non-repetitive three-dimensional arrangement are called amorphous solids or commonly called glasses e.g. volcanic glass are amorphous solids.. respects they are different from e.g. they have no sharp M.P or heated Look more like liquids Glass, tar and many solid polymers are also amorphous solids. Crystalline solids have sharp melting points. When a crystal is heated, all the particles are released from their fixed position at the same temperature. While amorphous solids do not have because in amorphous e solids the ions, molecules or atoms have a random or non-repetitive three-dimensional arrangement. These solids may be hard and elastic like crystal but in many respects they are different from crystals e.g. they have no sharp M.P or heat of fusion due to random arrangements of particles which do not leave their positions at fixed temperature. IN metallic crystals the metal atoms have free electrons because of its large size. These free electrons are responsible for the conduction of electric current. In ionic crystals the oppositely charged ion are firmly held in the: crystal lattice and are unable to towards to their respective electrodes. Hence they are unable to conduct the electric current. When an ionic crystal breaks, the planes formed are called cleavage planes. Two adjacent cleavage planes intersect always at definite angles. The magnitude of the interfacial angles, after cleavage has taken place, may differ from solids to solids and is a characteristic of a given solid. Is means same and morph means shape. Two or more substances, which have the same crystal structure, are called isomorphous and the phenomenon is called isomorphism. Isomorphous substances have usually the same ratios of their atom. E.g. The physical and chemical properties of isomorphs are quite different from one another. It is an imaginary line drawn through the crystal such that rotating the crystal through 360°. The srystal presents exactly the same appearance more than once. Figure When an element exists in more than one form, the phenomenon is called allotropy and the different forms are called allotropic forms or allotropes e.g. The following substances exist in more than one srystalline form. Carbon (graphite and diamond) Sulphur (rhombic and mono clinic) Covalent crystals are hard and molecular crystals are soft because covalent crystal contain strong covalent bond among the constituents atoms/Particals while molecular solids contain weak Vander Waal force among their constituent molecules/ Particals.
A crystal consists of regularly three-dimensional orderly arrangement of constituent particles (atoms, ions or molecules). In crystalline solids these atoms ions or molecules are shown by positions in space and not size. These points in a are called as lattice points or lattice sites. This arrangement of points in a crystal is called crystal lattice or space lattice. A simple definition of space lattice or crystal lattice is (A geometric arrangement of the points in space at which the atoms, molecules or ions of a crystal occur is called space lattice or crystal lattice.)
Plane of symmetry
Isomorphs
Atomic ratio
Crystal
Structure.
1 : 1 Cubic
NaF and MgO
K2SO4&K2SeO4
2 : 1 : 4
Orthorhombic
