Home
Class 11
CHEMISTRY
The averge (C C) bond energy is 343 kJ m...

The averge `(C _C)` bond energy is `343 kJ mo1^(-1)`. What do you predict for the Si -Si single bond energy
(b) Carbrundum `(SiC)` and corundun `(A1_(2)O_(3))` are important abrasives Comment on the structures for these compounds to explain why they have such hardness .

Text Solution

Verified by Experts

Covalent bonds between the `3rd` Period non-metals are generally weaker than the bonds between atoms of their 2nd period neighbours `Si-Si` bonds are expected to be weaker than `C-C` bonds Their bond strength should be lass than `300kJ` `mol^(-1)`
(b) The hardness reults from the fact the atoms are bonded together in three dimensional arrays by strong bonds SiC has the diamond structure The bonds in `A1_(2)O_(3)` have ionic character as well as covalent .
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    CENGAGE CHEMISTRY ENGLISH|Exercise Ex 2 .2 Subjective (Intermolecular Forces And H-Bonding)|7 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    CENGAGE CHEMISTRY ENGLISH|Exercise Ex 2 .2 Subjective (Molecular Orbital Theory)|4 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    CENGAGE CHEMISTRY ENGLISH|Exercise Archives Subjective|15 Videos

  • ATOMIC STRUCTURE

    CENGAGE CHEMISTRY ENGLISH|Exercise Concept Applicationexercise(4.3)|19 Videos

  • CHEMICAL EQUILIBRIUM

    CENGAGE CHEMISTRY ENGLISH|Exercise Subjective type|1 Videos

Similar Questions

Explore conceptually related problems

The heat of atomization of a compound XY_(3) in gaseous state is E kJ mol^(-1) what is the X-Y bond energy of kJ mol^(-1) unit?

The enthalpy of atomisation for the reaction CH_(4) (g) rarr C (g) + 4H (g) " is " 1665 kJ mol^(-1) . What is the bond energy of C - H bond ?

The SI unit of energy is J = kg m^2 s^(-2), that of speed upsilon is ms^(-1) and of acceleration a is ms^(-2) which of the formulae for kinetic energy (K) given below can you rule out on the basis of dimensional arguments (m stands for the mass of the body). (a) K = m^2 upsilon^3 (b) K = (1)/(2)m upsilon^2 (c ) K= ma (d) K =(3)/(16)m upsilon^2 (e ) K = (1)/(2) m upsilon^2 +ma

What would be the bond formation energy of C-H bond if its bond energy is + 416.18 kJ mol^(-1) ?

in C_(1)-H, C_(2)-H and C_(3)-H the homolytic bond dissociation energy order is :

Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e., E_(A) lt E_(B) lt E_(C) . If lambda_(1), lambda_(2), lambda_(3) are the wavelengths of radiations correspnding to the transitions C to B, B to A and C to A respectively, which o fthe following statements is correct?

Bond energies can be obtained by using the following relation: DeltaH (reaction) = sum Bond energy of bonds, broken in the reactants -sum Bond energy fo bonds, formed in the products Bond enegry depends on three factors: a. Greater is the bond length, lesser is the bond enegry. b. Bond energy increases with the bond multiplicity. c. Bond enegry increases with electronegativity difference between the bonding atoms. Use the bond enegries to estimate DeltaH for this reaction: H_(2)(g) +O_(2)(g) rarr H_(2)O_(2)(g) {:("Bond","Bond energy"),(H-H,436 kJ mol^(-1)),(O-O,142 kJ mol^(-1)),(O=O, 499kJ mol^(-1)),(H-O,460kJ mol^(-1)):}

Bond energies can be obtained by using the following relation: DeltaH (reaction) = sum Bond energy of bonds, broken in the reactants -sum Bond energy fo bonds, formed in the products Bond enegry depends on three factors: a. Greater is the bond length, lesser is the bond enegry. b. Bond energy increases with the bond multiplicity. c. Bond enegry increases with electronegativity difference between the bonding atoms. The heat of formation of NO from its elements is +90 kJ mol^(-1) , What is the approximate bond dissociation enegry of the bond in NO ? BE_(N=N) = 941 kJ mol^(-1) BE_(O=O) = 499 kJ mol^(-1)

(a) The decomposition of A into products has a value of K as 4.5 xx 10^(3)s^(-1) " at "10^(@)C and energy of activation 60kJ "mol"^(-1) . At what temperature would K be 1.5 xx 10^(4) s^(-1) ? (b) (i) If half life period of a first order reaction is x and 3//4^(th) life period of the same reaction is y, how are x and y related to each other ? (ii) In some cases it is found that a large number of colliding molecules have energy more than threshold energy, yet the reaction is slow. Why?

Which statement is/are correct(more than one correct) ? (a) In aqueous solution A1 gives hydrated ions [A1(H_(2)O)_(6)]^(3+) (b) Most of aluminium compounds are covalent because formation of A1^(3+) requires much more energy (=5138 kJ mo1^(-1)) which is not available ordinarily (c ) In aqueous solution A1 forms hydrated ions becuse og high (negative) heat of hydration of A1^(3+) compensates the high IE_(3) of A1 (d) Magnitude of hydration energy of A1^(3+)lt IE_(3) of A1 .

CENGAGE CHEMISTRY ENGLISH-CHEMICAL BONDING AND MOLECULAR STRUCTURE-Solved Examples
  1. Arrange C-C,C=C and C-=C in order of (i) Decreasing bond dissociatio...

    Text Solution

    |

  2. The Pt-Cl distance is 2.32 A in several crystalline compounds What i...

    Text Solution

    |

  3. The averge (C C) bond energy is 343 kJ mo1^(-1). What do you predict f...

    Text Solution

    |

  4. What is the hybridisation state of each C-atom in the following molecu...

    Text Solution

    |

  5. How many sigma and pi bonds are present in a benzene molecule ? .

    Text Solution

    |

  6. (a) What is the number of molecular orbitals obtained by mixing of two...

    Text Solution

    |

  7. Compare and contrast the concepts of hybrid orbitals and molecular orb...

    Text Solution

    |

  8. Which of the following molecules has the highest IE (i) Ne (ii) F

    Text Solution

    |

  9. Select the species with the largest IE in each (i )Na,K,Rb (ii) F,Ne

    Text Solution

    |

  10. Select from following gropus, the one which has the largest radius Li,...

    Text Solution

    |

  11. Distinguish using the property mentioned in brackets (e) NF(3),NH(3) ...

    Text Solution

    |

  12. Which of the following alkali metal chlorides is expected to have the ...

    Text Solution

    |

  13. Explain Why H(2)O is liquid while H(2)S is gas

    Text Solution

    |

  14. How do you account for the difference in melting points between (a) an...

    Text Solution

    |

  15. A plant virus was found to consist of uniform cylindrical particles 10...

    Text Solution

    |

  16. Calculate the I-I distance in each of the isomeric compounds C(2)H(2)I...

    Text Solution

    |

  17. Calculate the I-I distance in each of the three isomeric diiodobenzene...

    Text Solution

    |

  18. Enthalpic of hydrogenation of ethene (C(2)H(4)) and benzene (C(6)H(6))...

    Text Solution

    |

  19. Select the species which is best described CI,Ar,K (has the smallest...

    Text Solution

    |

  20. (a)The CI-O bond distance in CIO(4)^(Θ) is 144pm What do you conclude ...

    Text Solution

    |