9th Class Chemistry Chapter 6 Solution Short Questions Answer
9th Class Chemistry Chapter 6 Solution Short Questions Answer
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Suspensions and solutions do not show Tyndall effect because in suspensions particles are so big that light is blocked and difficult to pass. But in solution particles are so small that they cannot scatter the rays of light, thus do not show Tyndall effect. But colloids can show Tyndall effect because particles scatter the path of light rays thus emitting the beam of light i.e., exhibit the Tyndall effect.
Tyndall effect is the main characteristic which distinguishes colloids from solutions and suspensions because only colloids can show Tyndall effect while suspensions and solution do not show this effect.
Suspension is a heterogeneous mixture of undissolved particles in a given medium. Particles are big enough to be seen with naked eye. These particles are so big that light is blocked and difficult to pass. That is why, solutions mixture particles should be dissolved and form a uniform mixture.
We will pass light in the solution, if the given solution scattered the light then it is a colloidal solution because scattering of light or Tyndall effect is the main characteristic which distinguishes colloids from solution.
True Solutions:
Copper sulphate solution, silver nitrate solution
Colloidal Solution:
Blood, tooth paste, starch solution, glucose solution
We stir paints thoroughly before using because paint is a suspension. And suspension is a heterogeneous mix of undissolved particles in a given medium particles are big enough to be seen with naked eye particles settle down after sometime. Whenever, we use paint we stir it thoroughly because the settled down particles will suspended again in mixture and will be easy to use.
Soap solution will scatter light among all because soap solution is good example of colloidal solution, colloidal solution show Tyndall effect which is the main characteristic of colloidal which make them different from solutions and suspensions. So, soap is a colloidal solution.
Like dissolves like is the general property of or general principle of solubility, which means polar solvents dissolves polar solutes while non-polar solvents dissolves non-polar solutes.
Solution formation depends upon the relative strength of attractive forces between solute-solute, solvent and solute-solvent. Generally, solutes are solids. Ionic solids are arranged in such a regular pattern that the inter-ionic forces are the solute-solute attractive, then solute dissolves and makes a solution. If force between solute particles are strong enough than solute-solvent forces, solute remains insoluble and solution is not formed.
When NaCl is added in water it dissolves readily because the attractive interaction between the ions of NaCI and polar molecules of water are strong enough to overcome the attractive forces between Na⁺ Cl⁻ ions in solid NaCI crystal. In this process, positive end of the water dipole is oriented towards the CI⁻ ions and the negative end of water dipole is oriented towards the Na⁺ ins. These ion-dipole attractions between Na⁺ ions and water molecules, CI⁻ ions and water molecules are so strong that they pull these ions from their positions in the crystal and thus NaCI dissolves.
Solubility of some salts which are usually ionic in nature increases with the increase in temperature for such solutes. It means that heat is required to break the attractive forces between the ions solute. This requirement falls down and test tube becomes cold.
It is the volume in cm³ of a solute dissolved in 100g of the solution for example: 30% of alcohol solution means 30cm³ of alcohol dissolved in sufficient amount of water, so that the total volume of the solution becomes 100 cm³.
