Q6 The table below contains some mean bond energy data: Bond H-HC-CNEN Mean bond energy /kJ mol-¹436 348 944 (i) Balance the equation below for the formation of one mole of ammonia, NH3, from its elements. N₁₂ + H₂ -38 kJmol-¹ (ii) Use the data in the table above to calculate the bond energy of N-H bond in NH3 in the reaction given in (i) above. Comment on why the value obtained is referred to as 'mean bond enthalpy' (Show working as this question will be assessed using grade descriptors 1, 3 & 7) Bond H-HC-HC-C Mean bond energy /kJ mol-¹436 418 348 (iii) Use the equation below and data from the table to calculate a value for the C=C bond energy in ethene. H H I I C C + H-HH-C-C-H AH = -136 kJ mol-¹ I I H H HH I ī Ethene NH3 DH = HH Ethane
Types of Chemical Bonds
The attractive force which has the ability of holding various constituent elements like atoms, ions, molecules, etc. together in different chemical species is termed as a chemical bond. Chemical compounds are dependent on the strength of chemical bonds between its constituents. Stronger the chemical bond, more will be the stability in the chemical compounds. Hence, it can be said that bonding defines the stability of chemical compounds.
Polarizability In Organic Chemistry
Polarizability refers to the ability of an atom/molecule to distort the electron cloud of neighboring species towards itself and the process of distortion of electron cloud is known as polarization.
Coordinate Covalent Bonds
A coordinate covalent bond is also known as a dative bond, which is a type of covalent bond. It is formed between two atoms, where the two electrons required to form the bond come from the same atom resulting in a semi-polar bond. The study of coordinate covalent bond or dative bond is important to know about the special type of bonding that leads to different properties. Since covalent compounds are non-polar whereas coordinate bonds results always in polar compounds due to charge separation.
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