PErIodiC TeAcHer

Use the following link to attend quiz: Quiz - 1 (Concentration terms)

                                                                    Subjective Questions 1.  Why is benzene soluble in toluene but not in water? Sol.  “ Like dissolves like”. Benzene and toluene are non-polar; H 2 O is polar. 2 . Explain, why solute-solute, solvent-solvent and solute-solvent interactions are important in determining the extent to which a solute dissolves in a solvent? Sol : In the dissolution process, solute – solute, solvent – solvent interactio n overcom e  and solute – solvent interactions are overcome and solute – solvent i nteractions are established. The solubility of a solute thus, depends on the strength of new solute – solvent interactions relative to the strengths of solute – solute and solvent – solvent interactions. 3. Indicate the type of solute – solvent inter mole...

Identify the soluble compounds in water Solution s  of solids in solids (solid solutions) This type of solution is formed by mixing two solid components. For example, brass, bronze, monel metal and steel. Solid solutions are classified into two categories: substitutional solid solutions and interstitial solid solutions. l  Substitutional solid solutions  are formed by placing atoms of one kind into the place of other substance in its crystal lattice. Brass is a common example of the substitutional solid solution of copper and zinc. l  Interstitial solid solutions  are formed by placing atoms of one kind into the voids in the lattice of atoms of other substance. Tungsten carbide, an extremely hard substance, is a common example of interstitial solid solutions. S olubility  of solids in liquids  ( Saturated, unsaturated, supersaturated solutions) A solution which contains as much solute as it can be dissolve d  at a given temperature is called a sat...

For a given solution, the amount of the solute dissolved in a unit volume of solution (or a unit amount of solvent) is termed as the concentration of the solute.   Solutions containing relatively high concentration of solute are called concentrated solutions while solutions of relatively low concentration of solute are termed as dilute solutions. The concentration of a solution can be expressed in a number of ways. For more information click the following: Concentration Terms

Introduction In normal life we rarely come across pure substances. Most of these are mixtures containing two or more pure substances. Their utility or importance in life depends on their composition. For example, the properties of Brass (mixture of Cu and Zn) are quite different from those of German silver (mixture of Cu, Zn and Ni) or Bronze (mixture of Cu and Sn); 1 ppm of Fluoride ions in water prevents tooth decay, while 1.5 ppm causes the tooth to become mottled and high concentrations of fluorides ions can be poisonous (for example, sodium fluoride is used in rat poison); intravenous injections are always dissolved in water containing salts at particular ionic concentrations that match with blood plasma concentrations and so on. Solution  - What does it mean? A true solution is defined as a perfectly homogeneous mixture of two or more substances   (called as components)  having uniform properties throughout and the composition of which may vary within limits. The su...