Historical development of chemical bonding

• Main Author: Samano, Angelita Venus
• Format: text
• Language: English
• Published: Animo Repository 1974
• Subjects: Chemical bonds; Ionic equilibrium; Chemistry; Quantum Physics
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/345
• Institution: De La Salle University

v. 1. It is the object of this paper to treat the historical development of chemical bonds. Discussed in this study were three main periods of stages of development of quantum mechanics. Planck's quantum theory paved the way for wave mechanics. Bohr propounded a theory of the spectrum of hydrogen atom. While both theories proved useful and enlightening, they were found wanting and insufficient. They could not account for the emission and the absorption of radiant energy. They failed to explain adequately the motion of atoms and sub-atomic particles. Finally, they could not make predictions concerning some observed phenomena. Hence, their very inadequacies led to the development of the modern theories, namely: De Broglie's Wave-Particle Theory, the Schrodinger's Wave Mechanics Equation, Heisenberg's Uncertainty Principle and Pauli's Exclusion Principle. v. 2. The teaching of chemistry, in general, and of ionic bonding, in particular, poses a real challenge to the science teacher today. There is need for the chemistry teacher to keep abreast with the present trends in science, both in content and approach. The purpose of this paper is to expound on an approach to the teaching of chemistry in the secondary level, specifically on ionic bonding. The said approach is calculated to give a more meaningful understanding of the concepts involved. In the past, less emphasis was given on the study and development of ionic bonding however, the present trend is to motivate the students to gain a thorough understanding of the formation of ions and ionic compounds. This paper will attempt to present a method of teaching ionic bonding, which will answer the following questions : 1) What is ionic bonding? 2) How are crystal structures of ions formed? 3) What are the typical properties of ionic compounds? 4) Why are ionic compounds soluble in water? 5) How does ionic bonding differ from the other types of bonding? The present paper provides a weeks lesson on ionic bonding, sequentially ordered, together with varied methods and approaches appropriate to particular lessons. It includes topics concerned only with the following: ionic radii and crystal structure, and the properties of ionic compounds. v. 3. It is the purpose of this paper to present a literature survey of the definitions of acids and bases, and some quantitative aspects of acid-base equilibria in aqueous solutions. Specifically, this paper will attempt to answer the following questions : 1) What are the acid-base concepts according to: a) Arrhenius b) Bronsted and Lowry c) Lewis? 2) What is the modern acid-base concept? 3) Among the different acid-base concepts, what are their points of similarities? Where is their point of departure? 4) Why do acid-base reactions occur? This paper hopes to give a clearer understanding of the chemical reactions in general and of neutralization reactions in particular. It also hopes to explain the mechanism by which acid-base concepts propounded by Bronsted and Lowry and Lewis affect the role of chemical reaction.