Category: science
Molecular solids Covalent solids Metallic solids Ionic solids 1 These are made up of molecules. These are formed by the network formed by the atoms. These solids are formed in metals only by the special bonding. These are formed by the electrostatic attraction between oppositely charged ions. 2 The molecules are held by the
It is the substance that increases the rate of reaction and itself is recovered in the same amount at the ending of reaction. It lowers the activation energy by providing an alternative pathway. And makes the reactants to cross the energy barrier easily. Mostly the transition metals like Iron, Cobalt ,Nickel , Platinum etc are
In case of PCl5 the bond pairs present on the axial position suffer more repulsion than that of bond pairs present on the equatorial position. Actually each bond pair present at the axial position has to face the repulsion of three equatorial bond pairs, due to this the bond is stretched and hence the bond
In case of hydrogen iodide the bond length is larger as compared to hydrogen fluoride. As the size of fluorine is smaller than iodine, the bond between hydrogen and fluorine is stronger and have lower bond length. This makes it harder to break the bond and release H+ ions. But in case of Hydrogen iodide
1. Zinc blende – ZnS 2. Calamine – ZnCO3 Uses of Zinc metal. The zinc metal is used for the manufacture of dying or painting , also for galvanization of iron. It is also used as the outer cover of dry cell and as a cathode also. Ores of copper and their uses Copper pyrites
Void is the empty space present in the crystal lattice. It is the unoccupied space in between the lattice points. There are:- 1. Tetrahedral void 2. Octahedral void
Step 1 : Assume the percentage as grams and divide it with molar mass. Step 2: By this way you have calculated the number of moles , further divide evey term with the smallest term which you have calculated in step 1. Step 3 : Now you have the simple whole number ratio of elements
This is a type of reaction mechanism that is seen in case of nucleophillic substitution reactions. It is BIMOLECULAR NUCLEOPHILLIC SUBSTITUTION mechanism. In this kind of mechanism two molecules decide the rate of reaction, so it is BIMOLECULAR mechanism. The whole mechanism proceeds through a single step. That concerted step involves the bond breaking and
These three words are commonly seen in the marketing industry just to sell their products. Everyone wishes to be lucky and once they see these magical words their psychological balance tilts towards the tempting offers and the whole affair ends up in just selling what they want to sale. I am not saying that we
For this we have to understand that the nature of water is polar. And salt is an ionic compound which is also polar in nature. But sugar is non polar in nature and thus it have a different nature. The dissolution of substances follow a simple rule ,”Like dissolves like.” So salt will dissolve faster
Molarity : It decreases with increase in temperature. Molality : It remains constant . Doesn’t change.
Hardy-Schulze rule It has two postulates (i) The ions which carry charge opposite to the particles of sol are more effective in causing the coagulation of the solution. (ii) Coagulating power of an electrolyte is directly proportional to the fourth power of the valency of the ions causing coagulation.
On addition of gelatin , the gold solution starts behaving like a lyophilic colloid . Otherwise the gold solution is lyophillic colliod.
the process of formation of colloids.
The aging of different organisms is mainly calculated by the special technique called the Radiocarbon dating. In this technique the age of any specimen is calculated on the basis of the present amount of an isotope of a particular element. Isotopes are the atoms of an element that have same atomic number but different atomic
Lyos – solution, phobic – hating(fear) Firstly in this case we have to understand that the lyophobic colloids are those in which the dispersed phase do not have affinity for the dispersion medium. So if we add any suitable electrolyte in it , the colloidal solution easily gets coagulated.
Hi guys today we are going to talk about the white trail formation during the winter, when an aeroplane flies. To understand this phenomenon we must be aware of the combustion process taking place at the time of working of engine. During the combustion process, carbondioxide and water vapours are the major products. The water
the movement of colloidal particles under the influence of applied charge.
Multimolecular colloids are formed when the molecules of dispersed phase aggregate to make a molecule which is having the size between 1nm to 1000nm. The point to note here is , the particles of colloidal solution were of molecular size which joined to make Multimolecular system. Macromolecular colloids are the substances in which the size
