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When α -particles are sent through a thin metal foil, most of them go straight through the foil because (one or more are correct):
(1) Alpha particles are much heavier than electrons
(2) Alpha particles are positively charged
(3) Most part of the atom is empty space
(4)Alpha particles move with high velocity
Ans: Most part of the atom is empty space
procedure and curves for radiometric titration
2+2
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Calculate the amount of heat required to raise the temperature of an 58 sample of water from 34c to 64c. Express your answer using two significant figures
what is law of defenit propotion
GROUP 2: ALKALINE EARTHS The elements known commonly as alkaline earths have atoms with the (ns) 2 design and almost always have the +2 oxidation state in their compound
GLASS: Glass is amorphous solid which is not true solid, it is rather super cooled liquid which possesses a very high viscosity. It has no fixed melting point, on heating graduall
Thermoplastic: These polymer gets soften on heating and can be converted into any shape that they can retain on cooling. Such polymers that soften on heating and stiffen on coolin
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The energy of electron in hydrogen atom in its grounds state is -13.6 eV. The energy of the level corresponding to the quantum number equal to 5 is: (1) -0.54 eV (2)
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