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The prefix ekacomes from the Sanskrit word for "one." Mendeleev used this prefix to indicate that the unknown element was one place away from the known element that followed the prefix. For example, eka-silicon, which we now call germanium, is one element below silicon. Mendeleev also predicted the existence of eka-manganese, which was not experimentally confirmed until 1937 because this element is radioactive and does not occur in nature. Based on the periodic table shown in Figure, what do we now call the element Mendeleev called eka-manganese?
Compute the freezing point and boiling point of an anti freeze solution that is 50% by mass of ethylene glycol (HOCH2CH2OH) in water. Ethylene glycol is anonelectrolyte
When using the Cahn-Ingold-Prelog rules for prioritizing groups on a stereogenic carbon, priority is first assigned on the basis of
Discuss criteria you would use to choose between the use of indicators and a pH meter to determine the endpoint of an acid/base titration.
explain the formation of line spectrum in the balmer series of hydrogen atom. if the emitted photon has a wavelength of
How many hours are required for .235 mol of electrons to flow through ta circuit if the current is 1.68 A
A concentration cell consists of two H2/H+ electrodes. Electrode A has H2 at 0.83 atm bubbling into 0.29 M HCl. Electrode B has H2 at 0.56 atm bubbling into 1.8 M HCl.
question a reverse osmosis unit is used to obtain drinkable water from a source that contains 0.870 g nacl per liter.
Calculate the radiation dosage (in grays) for an 85-kg person that is exposed for 7.0 seconds to a 3.0 Ci source of beta radiation. Assume that 100% of the radiation is absorbed and each beta particle has an energy of 1.7× 10-13 J.
a sample of nitrogen gas occupies 1.55 L at 27.0 C and 1.00 atm pressure. What will the volume be -100 C and the same pressure?
A hydrogen atom electron is in the 6f state. State the values of all quantum numbers associated with this state. Find the value of energy of the electron. Compute the values of L and possible values of Lz and the minimum and maximum angles between L ..
(alpha)-Synuclein is a protein that makes membranes, including vesicles bend. It can bend spherical vesicles into tube-like shapes called tubules. The molecular weight of (alpha)-synuclein is 15,400 g/mol.
What mass of water can be heated from 22?C to 100 ? C by burning this piece of coal? Answer in units of g
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