Chemistry / کیمسٹری

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Why sintered glass crucible is preferred over goach crucible?

on May 05, 2016

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Sintered glass crucibles are preferred over glass crucible because there is no need of preparation as with goach crucible and it is most convenient to use the sintered glass crucibles.

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Bond distance is the compromise distance between two atoms. Explain with reason?

When two atoms come close to make a bond then their attraction increases and potential energy decreases. At specific distance, attraction become maximum and P.E become minimum, so bond formation takes place. It is the compromise distance between two atoms. When atom further come closer than attraction become minimum and P.E become maximum. Then repulsion take place between two atoms and bond formation does not take place. Hence, bond distance is compromise distance between two atoms.

Why Molecular orbital theory is superior to VBT?

Molecular orbital theory tells us that how no bond is formed between noble gases. It also tells about observed paramagnetic behavior of O 2 it also tells us that molecule is a set of molecular orbital formed by overlap of atomic orbitals. On the other hand, valence bond theory does not give such answers. Thus MOT is superior to VBT .

Write the structure of NH_3 acceding to VSEPR Theory?

According to VSEPR theory, Amonia is the example of AB 4 type with one lone pair and three bond pair of electron. Bond angle in NH 3 is 107.5 o .Bond angle reduced from 109.5 o to 107.5 o due to lone pairs of electron. Structure of ammonia is pyramidal.