Mindblown: a blog about philosophy.
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Hess`s law
Hess’s law states that the standard reaction enthalpy for overall reaction taking place in several steps will be equal to the sum of standard enthalpies of intermediate reaction steps by assuming that each step occurs at the same temperature.
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Enthalpy Change
Enthalpy change is defined as the change in energy of a system at constant pressure. It is denoted as ΔH. Enthalpy is a state function. Enthalpy change, ∆H = ∆U + ∆ngRT, can be calculated directly from the change in heat at constant pressure, ∆H = qp
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Introduction
Thermodynamics deals with the change of energy in physical and chemical processes. It allows us to study these changes quantitatively as well as to make effective predictions. Therefore, we divide the universe as surrounding and system. Physical or chemical processes lead to progression or immersion of heat part of it may be converted to work.…
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FAQs
hat does the Valence bond theory state? In valence bond theory, the atomic orbitals of individual atoms are combined to form chemical bonds. What is the meaning of lone pair of electrons? In chemistry, a lone pair refers to a pair of valence electrons that are not shared with another atom in a covalent bond…
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Few Important Questions
How is a chemical bond formed? Explain in detail. What is Octet rule? Write its limitations and importance. Write the difference between a pi bond and a sigma bond. Explain polar covalent bond with an example.
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Lone Pairs Of Electrons
A few atoms which are bonded have an extra pair of electrons which are not involved in bonding. Such electrons are called lone pairs of electrons. Lewis dot structure represents the arrangement of lone pairs and bonded pairs around each atom of a molecule.
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Ionic Compound and Crystal Lattice
The crystal lattice is an ordered arrangement of an ionic compound which is pictured as a three-dimensional aggregation of negative and positive ions. There exists a charge balance between the negative and positive ions in a crystalline solid. The enthalpy of lattice formation stabilizes the crystal lattice.
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What Is Covalent Bonding
Lewis was the first to provide a description of covalent bonding based on the electron pair between atoms. Importance of Lewis dot symbol and Lewis Dot Structure are: Lewis dot symbol manifests the number of valence electrons of the atoms for given elements Lewis dot structure gives a pictorial representation of molecular bonding
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Introduction
The insight by Kossel’s about the mechanism of formation of electronegative and electropositive ions interconnected the process of attaining noble gas configuration by corresponding ions. They are stable due to the electrostatic attraction of allying ions. Hence gives rise to a concept called electrovalency.
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FAQs
How many elements are present in the periodic table? A total of 118 elements are present in the periodic table. What is the meaning of ionisation enthalpy? The enthalpy change associated with the removal of the original electron from an atom with a single gas in its ground surface is called as the first ionization…
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