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Q. Early Theories of Matter? In ancient Greece philosophers discussed the nature of matter. The philosopher Democritus held that matter was composed of elementary particles cal
How many KCal of heat are liberated when 48.0 grams of iron are burned to form Fe2O3 at standard state conditions? (Change of Hf^0 of Fe2O3 is -197 kCal/Mole )
biography on Cecil E Boord
Conductance and conductivity: When a field (electric) is put across an aqueous ionic solution by applying a voltage between two parallel plate electrodes, the cations are attra
Two kg Ammonia (mA) at P A = 300 kPa and T A = -10ºC and 1 kg Ammonia (m B ) at P B = 300 kPa and T B = 100ºC are mixed in a constant pressure and adiabatic process. Find th
Q. How to calculate atomic number? Atoms have no net electrical charge for the reason that they contain equal numbers of electrons and protons. Therefore positive charges (prot
The total number of electrons present in all the p-orbitals of bromine are: (1) Five (2) Eighteen (3) Seventeen (4) Thirty five Ans: Seve
why dipole moment of CH3CL is more than CH3F
How many ion H2- does have The H2- ion having three electrons. This can be conceived as the combination of a hydrogen atom with a hydride ion (H-). By the aufbau principle, two
Q. Magnetic Properties of f-block element? You have learnt in the preceding unit-that paramagnetism is related with the presence of unpaired electrons in a substance. The actin
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