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Entropy (S) is a molecular 'disorder', or more precisely 'the number of microscopic arrangements of energy possible in a macroscopic sample'. Entropy depends strongly on the state and increases with rise in temperature.
Entropy changes (ΔS) are positive for reactions that generate gas molecules. The Second Law of Thermodynamics defines that the total entropy always increases in a spontaneous process, and reaches a maximum value at equilibrium. To apply this to chemical reactions it is necessary to include entropy changes in the surroundings caused by heat output or input. Both external and internal changes are taken account of by defining the Gibbs free energy change (ΔG): for a reaction performing at constant temperature.
write the different units of hardness with their relationship
seven sloids
about occurence,properties of the following metal copper.gold,mercury
Q. Describe Structure of Solids? Ans. Solids are different from gases and liquids because they have a fixed shape. This definite shape occurs as the individual particles w
When Solutions of ammonia and Iron (II) bromide are mixed, what is the net ionic equation?
#questionproperties of p block elements ..
A water solution contains 64% Na 2 S 2 O 2 together with 1.0% soluble impurity. Upon cooling to 5°C, Na 2 S 2 O 2 ·5H 2 O. crystallizes out. The solubility of this hydrate is 1.35
The number of orbitals present in the shell with n= 4 is: (1) 16 (2) 8 (3) 18 (4) 32 Ans: 16
Atoms or group of atoms which are electrically charged are known: (1) Anions (2) Cations (3) Ions (4) Atoms Ans:
Why li 2 CO 3 decomposed at a lower temperature whereas Na2CO3 at higher temp?
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