What do you think would happen if you connected the pencil lead connected to the negative post after being in the copper nitrate solution to the positive post of the battery? explain why you think there would or would not be an observable change.

5. Using boxes to represent orbitals, draw the molecular orbital energy level diagrams for the following molecules, with energy increasing vertically, putting electrons into the appropriate orbitals. For each indicate: the bond order and whether the molecule is paramagnetic or diamagnetic.

a) B₂

b) CN-

c) NO

d) NO+

You may want to reference (Pages 821 - 825) Section 17.8 while completing this problem. You mix a 120.0 −mL − m L sample of a solution that is 0.0123 M M in NiCl2 N i C l 2 with a 185.0 −mL − m L sample of a solution that is 0.300 M M in NH3 N H 3 .

After the solution reaches equilibrium, what concentration of Ni2+(aq)Ni2+(aq) remains? The value of KfKf for Ni(NH3)62+Ni(NH3)62+ is 2.0×1082.0×108.

Express the concentration to two significant figures and include the appropriate units.

Why does the formation of 5-methylcytosine look more chemically difficult than formation of N6-methyladenine?

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.220 M HClO(aq) with 0.220 M KOH(aq). The ionization constant for HClO is 4.0e-8.

(a) before addition of any KOH

(b) after addition of 25.0 mL of KOH

(c) after addition of 30.0 mL of KOH

(d) after addition of 50.0 mL of KOH

(e) after addition of 60.0 mL of KOH

A gaseous mixture contains 413.0 Torr of H2(g), 391.5 Torr of N2(g), and 65.7 Torr of Ar(g). Calculate the mole fraction, X, of each of these gases.

Calculate the equilibrium ¹³⁵I concentration and the equilibrium ¹³⁵Xe for 3.0 w/o enriched fuel in a reactor that operates with a thermal neutron flux of 1 x 10¹³/(cm²*s). Use the value of Σ_f = 3.

Please explain your work!

An aqueous sodium sulfide solution has a vapor pressure of 80.9mmHg at 50 ?C. The vapor pressure of pure water at this temperature is 92.6 mmHg. (Assume sodium sulfide completely dissociates.)

What is the concentration of sodium sulfide in mass percent?

Please show all work.

. The freezing point of benzene is 5.5^oC What is the freezing point of a solution of 5.00 g C₁₀H₈ in 444 g   of benzene. You will need to look up the freezing point depression constant for benzene in a reference book.                 Calculated FP:

Benzene K_f = ___________ *remember you will need “m”, which is in Kg     Name of reference used: __________________      

Calculated FP:    

i factor used and explain i factor:

1)Write the complete equation (balanced with states) for the reaction between potassium chloride and lead (II) nitrate?

2) Which precipitate forms in the above mentioned reaction?

3) You mix 16.00 mL of 0.778 M lead (II) nitrate with 18.00 mL of 0.813 M potassium chloride, and collect and dry the precipitate. Calculate the following:

a) Moles of lead (II) nitrate used:

b)Moles of potassium chloride used:

c) Moles of precipitate expected from lead (II) nitrate:

d) Moles of precipitate expected from potassium chloride:

e) Compare parts c and d to indicate the limiting reactant.

f) What mass of precipitate do you expect to obtain from this reaction?

g) If the actual yield of the precipitate you recover is 0.916g, what is the percent yield of the precipitate?

show work please

Liquid A has a normal boiling point of 64 deg C and liquid B has a normal boiling point of 98 deg C. a) which has the greater vapor pressure? b) which has the weaker intermolecular attractive forces in the liquid state?

Evaluate the fugacity for a gas of Ar at 100 bar and 298 K

1A. A 1.54 gram sample of an unknown gas is found to occupy a volume of 0.780 L at a pressure of 728 mm Hg and a temperature of 33°C. The molecular weight of the unknown gas is

1B.A sample of an unknown gas is found to have a density of 1.03 g/L at a pressure of 0.609 atm and a temperature of 38°C. The molecular weight of the unknown gas is

1c.A 7.64×10^-2 mol sample of O₂ gas is contained in a 2.00 L flask at room temperature and pressure. What is the density of the gas, in grams/liter, under these conditions?

What is the importance of the Sandmeyer Reaction?

What is the azide group and why it is a good leaving group?

Explain how the mechanism of the Sandmeyer reaction differs of a typical Electrophylic Aromatic Substitution reaction