The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:
learnedshedsMany changes occur in nature, such as water evaporation, condensation, runoff, etc. The change of state is part of all these transitions. During any reaction, old bonds break in the reactants, and new bonds are formed in the materials.
The cause for different forms of reactions is the products generated, the changes that arise, the reactions involved, etc. There are different kinds of reactions:
Because energy is absorbed when chemical bonds are destroyed and released during their formation, chemical reactions nearly often require a change of energy between products and reactants. However, according to the Law of Energy Conservation, we know that the system’s overall energy must remain constant and that often the chemical reaction absorbs or releases energy in the form of heat, light, or both. The energy change in the chemical reaction is due to the differences in the amount of chemical energy deposited between ingredients and reactants. This accumulated chemical energy or heat content of the system is known as enthalpy.
It is a chemical reaction that starts with light absorbed as a source of energy. There are temporary peak states that get activated as the molecules absorb light, and there are significant changes in physical and chemical properties from the actual molecules.
Ideally, the photo-reaction mechanism should provide a thorough characterization of the key events as outlined in the photochemical reaction pathway classification. Quantum yield and rate constants are all related to photophysical and photochemical processes, along with details on the structure and fate of any reactive intermediates, their lifetimes and their reactivity.
An electrochemical reaction is a mechanism in which electrons, such as an electrolyte, move between a solid electrode and a substance. This flow induces an electrical current through the electrodes, which causes the reaction to release or absorb heat. Chemical reactions either consume or emit energy that may be in the form of electricity. Electrochemistry is a chemical division that talks about the transfer of chemical energy to electrical energy. It has many different uses in daily life. All kinds of batteries, from those used to power a torch to a calculator, depend on chemical reactions to produce energy. Electricity is used for plating objects with metals such as gold or chromium.
In this chapter, we learnt about the concepts of chemical changes and reactions. The chapter also shed some light on the nature and characteristics of chemical change.