Give one example for each of the following types of inter-particle forces
(a) London dispersion forces (b)Dipole-Dipole forces (c) Hydrogen bond (d) Ion-dipole forces
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When forces F1 , F2 , F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary.
(a) : F2 and F3 have a resultant equivalent to F1 Therefore, Acceleration = F1/m.
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What are lyophilic and lyophobic sols? Give one example of each type. Which one of these two types of sols is easily coagulated and why?
Lyophilic sols: Lyophilic sols are those sols in which the particles of dispersed phase have great affinity for the dispersion medium, e.g., sols of gum, gelatine, starch, etc. Lyophobic sols:...
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How are the following colloids different from each other in respect of dispersion medium and dispersed phase? Give one example of each type.
Type of Colloid Dispersed Phase Dispersion medium Example Aerosol Solid or liquid Gas Smoke, Fog, Cloud Hydrosol Solid Water Starch sol, Protein sol Emulsion Liquid Liquid Milk, hair cream
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Which of the following statements are true? (i) Only type of interactions between particles of noble gases are due to weak dispersion forces.
(b) (i) and (ii)
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How are the following colloids different from each other in respect of their dispersion medium and dispersed phase? Give one example of each.
Aerosol Emulsion Hydrosol 1. Sols in which the dispersion medium is gas and dispersed phase is solid or liquid. For example: Smoke, d 1. A colloidal system in which dispersion medium and dispersed phase...
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What are the following substances? Give one example of each one of them: (i) Tranquillisers
(i) Tranquillizers are a class of chemical compounds used for the treatment of stress, fatigue, and mild or even severe mental diseases. These relieve anxiety, stress, irritability or excitement by...
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Present a classification of colloids where dispersion medium is water. State the characteristics and one example of each of these classes.
When the dispersion medium is water colloids are classified as hydrophilic colloids and hydrophobic colloids. Hydrophilic colloids are solvent (water) attracting, reversible and quite stable, e.g., gum, starch, gelatin etc....
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Why did the concept of 'Garden City' come up in London? Describe the different efforts initiated to beautify London.
(i) The widespread use of coal in homes and industries in 19th century England raised serious problems. Shopkeepers, home owners and others complained about the black fog, grey skies and...
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Calculate the amount of work done in rotating a dipole, of dipole moment 3 x 10^-8cm,
P = 3 x 10-8cm ; E =104N/C At stable equilibrium (θ1 ) = 0° At unstable equilibrium (θ2) =180° Work done in rotating dipole is given by: W = PE (cosθ1 - cosθ2 ) =...
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Define: Dipole-Dipole Forces
Dipole-dipole forces: The force of attraction which acts between two molecules having permanent dipoles.
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