Surface chemistry deals with phenomena that occur at the surfaces or interfaces. The interface or surface is represented by separating the bulk phases by a hyphen or a slash. For example, the interface between a solid and a gas may be represented by solid-gas or solid/gas.
Coagulation is a process of aggregation or accumulation of colloidal particles to settle down as a precipitate. Substances like metals, their sulfides etc. cannot be simply mixed with the dispersion medium to form a colloidal solution. Some special methods are used to make their colloidal solutions.
Commonly used emulsifying agents include polymers (Spans and Tweens), sodium lauryl sulfate, sodium dioctyl sulfosuccinate, and tragacanthins (Haba et al., 2014).
Electrochemical cells are devices based on the principle that when a chemical oxidation-reduction reaction takes place, electrons are being transferred from one chemical species to another.
Types of emulsions
As far as the JEE exam is concerned, surface chemistry is an important topic. Students can easily score marks from this chapter. The important topics include adsorption, heterogeneous catalysis, corrosion, crystallization, etc.
The cells are constructed in separate beakers. The metal electrodes are immersed in electrolyte solutions. Each half-cell is connected by a salt bridge, which allows for the free transport of ionic species between the two cells. When the circuit is complete, the current flows and the cell “produces” electrical energy.
CBSE Class 12 Chemistry syllabus is divided into three parts - Physical Chemistry, Organic Chemistry and Inorganic Chemistry.
There are two types of electrochemical cells: galvanic, also called Voltaic, and electrolytic.
Electrochemistry is the scientific discipline studying the relationship between chemistry and electricity. It includes all technologies and techniques such as work on electrolysis, corrosion, batteries, fuel cells, accumulators, and electroplating.
Environment can be defined as a sum total of all the living and non-living elements and their effects that influence human life. While all living or biotic elements are animals, plants, forests, fisheries, and birds, non-living or abiotic elements include water, land, sunlight, rocks, and air.
Surface chemistry is important in many critical chemical processes, such as enzymatic reactions at biological interfaces found in cell walls and membranes, in electronics at the surfaces and interfaces of microchips used in computers, and the heterogeneous catalysts found in the catalytic converter used for cleaning
> The gold number is defined as the minimum mass of the colloid in milligram that is added to the 10ml of red gold sol to protect it from the coagulation when 1 ml of 10% NaCl is added.
Sorption is a physical and chemical process by which one substance becomes attached to another.
It is the migration of electrically charged colloidal particles in one direction under the influence of an electric field. When colloidal particles move towards positive electrode, they are negatively charged and vice versa. Electrophoresis is used to measure the rate of migration of sol particles.
Law of chemical combination. Atomic and molecular masses. Mole concept, molar mass, & percentage composition. Stoichiometry. Reactions in solution.
17 Amazing Chemistry Facts that will Blow Your Mind
Environmental Science attempts to explain how life on Earth is sustained, what contributes to our many environmental problems, and how these problems can be solved. Environmental Science & Management stands at the interface between humans and the Earth and explores the interactions and relations between them.
An oxygen atom has more mass (weight) than a carbon atom because it has more protons and neutrons. Atoms are made up of protons and neutrons, which are heavy, and electrons, which are very light.
Dated : 21-May-2022
Category : Education