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The enthalpy change (ΔH) in a reaction is equal to the heat input under conditions of constant pressure and temperature. It is not equal to the total energy change, as work may be done by expansion against the external pressure. The corrections are usually small, and enthalpy is used as a measure of the energies involved in chemical reactions. Endothermic reactions (positive ΔH) are ones need a heat input, and exothermic reactions (negative ΔH) give a heat output.
Hess' Law states that ΔH does not rely on the pathway taken between initial and final states, and is a consequence of the First Law of Thermodynamics, which asserts the conservation of total energy. It describes a schematic thermodynamic cycle where the ΔH can be expressed as the sum of the values for individual steps:
Nitrogen atom has an atomic number of 7 and oxygen has an atomic number 8. The total number of electrons in a nitrate ion will be: (1) 8 (2) 16 (3) 32
Homocyclic or Carbocyclic - Closed Chain Compounds Homocyclic are the compounds that comprising a ring or rings of carbon atoms just only in the molecule. The homocyclic or c
When does intrinsic semiconductor become an extrinsic semiconductor? Illustrate. Semiconductor doping is the process which changes an intrinsic semiconductor to an extrinsic se
Why phenol can also be prepared from chlorobenzene(Dow''s process)
Isomers, which vary in the orientation of groups around the double bounded carbon atoms, are known as geometrical Isomers. It is also known as Cis-Trans Isomerism.
Longest chain Rule - IUPAC system of nomenclature The primary step in naming an organic compound is to choose the longest continuous chain of carbon atoms that may or may not
What is the foundation of classification of cold and hot working? Cold and hot working: Changing the shape of material by extrusion, forging, rolling, drawing involves pl
does adding hcl to acetic acid and sodium acetate = more acid consumption r spodium consupmtion?>
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Why phenol does not react with sodium carbonate & sodium bicarbonate? Reason: This is because Phenol is less acidic than H 2 CO 3 and hence the reaction doesnt takes place.
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