Explain how symmetry arguments are used to construct molecular orbitals.

The following is a precipitation reaction: 2 K3PO4 (aq) + 3 Co(NO3)2 (aq) → Co3(PO4)2 (s) + 6 KNO3 (aq) What volume of 0.222 M K3PO4 (aq) in milliliters is needed to react with 36.48 mL of 0.250 M Co(NO3)2 (aq)?

For two reversible competing one-step reactions, A-Y and A-Z, how does the Y/Z ratio change with a) reaction temperature, b) reaction time if Y is the kinetic product and Z is the thermodynamic product? Please explain with the help of a reaction energy diagram.

River water between Back Falls and Angel Falls contains 0.0769 mg Al3+ per L and has a pH of 8.20. Total carbonates are 0.005 mol L-1 .

(a) [5 marks] Calculate the concentrations of HCO3 - (aq) and CO3 2- (aq) (in mol L-1 ). For H2CO3(aq), the hydrolysis constants are Ka1 = 4.45 × 10-7 and Ka1 = 4.69 × 10-11

(b) [5 marks] Calculate the alkalinity

Question 260.4 pts

Arrange the following elements, Se, Ca, Ar, Cs, Ge in order of increasing first ionization energy, (IE1).

what are the names and structures of the major organic compounds anticipated to be obtained in the sequiterpene component of the turmeric extract?

write the balanced complete ionic and net ionic equations for K2SO4(aq)+BaCl2(aq)-->KCl(aq)+BaSO4(s),

Al(NO3)3(aq)+NaOH(aq)-->Al(OH)3(s)+NaNO3(aq),

CaCl2(aq)_Na2CO3(aq)-->NaCl(aq)+CaCO3(s

Na2S(aq)+Pb(C2H3O2)2(aq)-->PbS(s)+NaC2H3O2(aq)

The Kefauver Amendments of 1962 to the Food Drug and Cosmetic Act added requirements except:

a. All drugs must be safe and effective, including all drugs approved by FDA since 1938

b. Drug manufacturers must collect safety information once a product is approved

c. New drug approvals were for a five year period and had to be renewed every five years to remain on the market

d. New drugs require FDA consent when they are studied before approval during what would be known as the IND phases

In the lab: extraction, purification and analysis of turmeric natural products, Calculate the amount of 3M HCI that would be needed to neutralize the 35 mL of 1M NaOH used in the extractions when you add 20mL 1M NaOH and 10mL saturated sodium chloride to a seperatory funnel which contains 5mL turmeric (extracted from MTBE) and 5 mL of MTBE, shake it, seperating the layers.. You then drain the lower aqueous layer into a flask and leave the top (MTBE) layer in the seperatory funnel and extract it a second time with 15 mL 1M NaOH then combine the NaOH layer with the previous layer in a flask and save for later..

what is the theory behind acid-base separations (i.e. how does it work and how can it be used to purify an impure organic compound)?

Suppose that a student collects the following spectrophotometric data to determine the relative concentrations of HMR and MR in solution: The abosorbance at 425 nm was measured to be 0.170 and at 520 nm was 0.690, the slopes corresponding to standard Beer's Law plots were as follows:

αIA = 0.072

αIB = 0.306

αIIA = 0.760

αIIB = 0.036

Using this data, calculate the ratio between the relative concentrations of MR- and HMR in this solution.

There is a total of 6 trials for an experiment involving the measurement of standard enthalpies (kcal/mol).

a) If additional data points are taken but the standard deviation and mean remain unchanged, what will happen to the 95% confidence interval? Would it increase, decrease, or stay the same?

b) What are the different ways to identify a systematic error in her data for this experiment ?

Hi, i'm working on lab report on iodometric determination of Cu in Brass and can someone please explain in WORDS on how the analyte (copper) reaction with iodide works? thanks

2Cu2+ + excess I- → 2CuI(s) + I2

A mineral contains 11.11% Ni (58.71 g/mol); 0.300 g of the same is treated and its ammoniacal solution is treated with 50.00 mL of a solution of 0.0911 M KCN. A little KI is added as an indicator and the solution is titrated with 0.0903 M AgNO₃ until slight turbidity appears. What volume of AgNO₃ will be needed?

I need name of the final compound, and step by step equations of the reaction for the experiment below. Ethylenediamine complexes of Cobalt Procedure 1. Dissolved 1.5 g CoCl2 in 5mL water 2. While the CoCl2 6H2O is dissolving, measure out 10mL of an ethylenediamine solution. (The solution is prepared by dissolving 130mL of anhydrous ehylenediamine in one liter of water) 3.Cool the ethylenediamine solution in ice. 4.Slowly add 2.1mL 3M HCl 5.Add the CoCl2 solution to the partially neutrolized ethylenediamine and then slowly add 2mL of 30% H2O2 with stirring 6.Stir until effervescence ceases. 7.Place the mixture on a hot plate and allow to boil gently 8.When the cobalt solution is evaporated the a volume of 6 to 10mL, add and equal volume of concd. HCl and twice the amount of ethyl alcohol. 9.Cool, filter, press dry on the sintered glass funnel. Thanks.