Mole is the unit used to define the number of chemical substance present in a substance. It is the amount of substance which consists of the same number of chemical units as there are atoms in exactly 12 gram of pure carbon-12.
A valency is a property of a groups or atoms, equal to the number of atoms of hydrogen that the group or atom could combine with or displace it in forming compounds.
This kind of question is made in order to ask your opinion about a successful principal and which qualities that a teacher and a principal must have. Having a vision and a clear goal, planning and motivating, communicating and visibility, consistency and accountability, caring, nurturing and developing staff and students are the qualities which must be concentrated on.
In a molecule when hydrogen atom is less than the ratio of carbon atom, then such molecules are referred as an organic molecule.
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Alloy of Tin and Lead
Graphite rod is used in nuclear reactor to convert fast moving neutrons into thermal neutrons.
Both techniques are used to the amount of chemical present in the solution. However they are almost similar but differs in
☛ Molarity is used to know the total amount of molecules in a 1 litre solution
☛ It is expressed as moles of a compound per litre of solution
☛ Normality is used to know the total number of reactive units in 1 litre of solution
☛ It is expressed in equivalent per litre