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CHEMiCAL BOnDinG AnD MOLECULAR StRUCtURE. After studying this Unit, you will be able to. understand Kössel-Lewis approach to chemical bonding; explain the octet rule and its limitations, draw Lewis structures of simple molecules; explain the formation of different types of bonds;
Chemical energy stored by molecules can be released as heat during chemical reactions when a fuel like methane, cooking gas or coal burns in air. The chemical energy may also be used to do mechanical work when a fuel burns in an engine or to provide electrical energy through a galvanic cell like dry cell. Thus, various forms of energy are ...
An insight into the structure of atom was obtained from the experiments on electrical discharge through gases. Before we discuss these results we need to keep in mind a basic rule regarding the behaviour of charged particles : “Like charges repel each other and unlike charges attract each other”.
Ans- Bond strength represents the extent of bonding between two atoms forming a molecule. The larger the bond energy, the stronger is the bond and the greater is the bond order. Q.5. Define the bond length. Ans- Bond length is defined as the equilibrium distance between the nuclei of two bonded atoms in a molecule.
The define Bond-dissociation energy (bond energy) To correlate bond strength with bond length. To define and used average bond energies. In proposing his theory that octets can be completed by two atoms sharing electron pairs, Lewis provided scientists with the first description of covalent bonding.
The primary or key difference between the bond dissociation energy and bond energy is that bond energy is the average amount of energy required to break down all the bonds present in a compound between the two similar types of atoms.
Exam board: Edexcel. Did this video help you? Bond energies. During a chemical reaction energy must be taken in to break bonds. Because energy is being taken in, bond breaking is an endothermic process. During a chemical reaction, energy is released when new bonds are formed. Because energy is released, bond making is an exothermic process.
