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What pair of elements would you expect to exhibit the greatest similarity in physical and chemical properties. WHY.
Lewis Structure for a Nitrate Ion (NO3-1). For the correct structure of the nitrate ion, what is the bond angle from O-N-O
Lewis Structure for a Nitrate Ion (NO3-1). How many possible resonance structures are there for the nitrate ion
Lewis Structure for a Nitrate Ion (NO3-1). Assign the formal charge for the central atom, Nitrogen. What is that formal charge
Which of the following chemical equations corresponds to the standard molar enthalpy of formation of N2O
Use line notation to represent the electrochemical cells for each of the following overall redox reactions
A person is exposed for three days to identical amounts of two different nuclides that emit positrons of roughly equal energy. The half-life of nuclide A is 18.5 days and the half-life of nuclide B
If 27.0 mL of 0.0200 M KMnO4 were required to titrate a 0.425 g sample of K3[Fe(C2O4)3] * 3H2O, what is the % purity of the complex
Titration of an oxalate sample gave the following percentages of percent oxalate: 12.28%, 12.54%, and 12.24%. Calculate the average and the standard deviation.
If the electrochemical cell is allowed to operate as a gavanic cell, which solution species will be oxidized, which solution species will reduce. write the sybolic representation for the galvanic ce
Write the standard half-cell reduction reaction equation for reactive species in the beaker. Determine the cell potential(Ecell) at the moment of mixing.
For the following reaction, calculate the concentration of C(aq) at equilibrium when .135M B solution is alllowed to react with A.
125 mole of oxygen gas is added to carbon in a .25L container. The mixture equilibriates at 500K. Calculate the equilibrium concentration of carbon monoxide, knowing that K=.086 at 500K.
In addition to the natural radioactive decay series that begins with U-238 and ends with Pb-206, there are natural radioactive decay series that begin with U-235 and with Th-232. Both of these serie
Assuming that teh F-18 can be transported at 58.0 miles/hour, how close must the hospital be to the cyclotron if 63% of the F-18 produced is to make it to the hospital
A layer of peat beneath the glacial sediments of the last ice age has a carbon-14/carbon-12 ratio that is 22.6% of that found in living organisms.
A patient is given 0.055mg of technetium -99m, a radioactive isotope with a half-life of about 6.0 hours.
Calculate the quantity of energy produced per gram of reactant for the fusion of two H - 2 (atomic mass = 2.014102 amu) atoms to form He-3 (atomic mass = 3.016029 amu) and one neutron.
3.2 x 10-3 moles of O2 gas effuse from a container in 10.0 minutes. How many moles of CH4 gas could effuse from the same container in 10.0 minutes under the same conditions
A compound burns in a bomb calorimeter that contains 2.80 L of water. If the combustion of 0.161 moles of this compound causes the temperature of the water to rise 48.0oC, what is the molar heat of
What is the pOH of a solution that is prepared by mixing 25.0 mL of 0.200 M HNO3 and 25.0 mL of 0.150 M KOH
A mixture of gases containing 0.40 mol of SO2 and 0.20 mol of O2 in a 4.0L flask reacts to form SO3. If the temperature is 25oC, what is the pressure in the flask after the reaction is complete
Explain the difference between the Bohr model for the hydrogen atom and the quantum-mechanical model.