4Au(s) + 16KCN(aq) + 3O2(g) + 6H2O(l) --> 4KAu(CN)4(aq) + 12KOH(aq) Balance using half reaction method. show all steps and please explain how you get the equation in each step

How many nitrate ions are present in 150.0 mL of 0.0875 M iron(III)nitrate?

How would you prepare 2.50 L of 0.0683 M CaCl2 from a 0.388 M solution of CaCl2?

A wastewater containing 150 mg/l chlorobenzene is treated in a laboratory adsorption unit using a PVC column, 1.0 inch internal diameter, to an effluent concentration of 15 mg/l . Service times, and throughput volumes at specified depths and flowrates associated with a breakthrough concentration of 15.0 mg/l are given in table 1.

table1 : result of adsorption column experiment

Loading rate,gpm/ft²   Bed depth,ft Throughput volume, gal Time, hr

1) is the attainable effluent concentration satisfactory from a regulatory standpoint?

2) determine the Bohart-Adams constant ( K,N₀ and x₀) for each hydraulic loading.

3)base on data derived above design an adsorption column 2.0 ft internal diameter to treat a wastewater flow 5,000 gal/d containing 150 mg/l of CB. The attainable effluent concentration is 15 mg/l and it is desired to operate the column for 90 days(8 hourslday,7 days/week) before reching exhaustion.

4)calculate the yearly carbon requirements in cubic feet.

what kind of information do you need? these are all what i got from paper

Define and differentiate between the terms reaction rate, rate expression, rate law, reaction order, and instantaneous rate law.

4Au(s) + 16KCN(aq) + 3O2(g) + 6H2O(l) --> 4KAu(CN)4(aq) + 12KOH(aq) Balance using half reaction method. show all steps

a) Write a balanced reaction for the formation of a polysiloxane starting form (CH₃)₂SiCl₂

b) Liquid silcones (polysiloxanes) are used of a variety of applications what are they and why are silicones used over hydrocarbon oils?

Cl=8 F=22

(a) How many chlorine trifluoride molecules are formed in the reaction depicted above?

(b) How many chlorine molecules remain after the reaction has gone to completion?

(c) How many fluoride molecules remain after the reaction has gone to completion?

(d) Which is the limiting reactant in the reaction depicted above?

(e) If the reaction was carried out with 2.05 moles of chlorine gas and 4.46 moles of fluorine gas, how many moles of chlorine trifluoride would be produced?

(f) If the reaction was carried out with 2.05 g of chlorine gas and 4.46 g of fluorine gas, how many grams of chlorine trifluoride would be produced?

Titration of 50.0mL of 0.100M HX (Ka=1.5x10^-5) with 0.100M NaOH. Calculate the pH of:

- buffer formed at the addition of 12.5mL NaOH

- buffer formed at the addition of 25.0mL NaOH

- buffer formed at the addition of 37.5mL NaOH

- solution obtained at the endpoint

Please do the endpoint especially!

Sulfur hexafluoride and Sulfur tetrafluoride are two common halides of sulfur.

a) Draw their lewis dot structures and describe their molecular shapes including bond angles.

b) Write a balanced reaction for the synthesis of SF₆.

c) Describe in detail the differences in reactivity and chemistry of the observed by the two compounds.

d) Please describe in as much detail as possible, uses for SF₆.

A) A buffer solution contains 0.484 M KHCO₃ and 0.314 M K₂CO₃. Determine the pH change when 0.126 mol NaOH is added to 1.00 L of the buffer.

pH after addition − pH before addition = pH change =

B) A buffer solution contains 0.335 M NH₄Br and 0.313 M NH₃ (ammonia). Determine the pH change when 0.072 mol KOH is added to 1.00 L of the buffer.

pH after addition − pH before addition = pH change =

C) Determine the pH change when 0.086 mol HI is added to 1.00 L of a buffer solution that is 0.442 M in CH₃COOH and 0.368 M in CH₃COO^-.

pH after addition − pH before addition = pH change =

A) Consider how best to prepare one liter of a buffer solution with pH = 4.94 using one of the weak acid/conjugate base systems shown here.

How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base?

grams potassium salt of weak acid =

grams potassium salt of conjugate base =

B) Design a buffer that has a pH of 3.75 using one of the weak acid/conjugate base systems shown below.

How many grams of the sodium salt of the weak acid must be combined with how many grams of the sodium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base?

grams sodium salt of weak acid =  g

grams sodium salt of conjugate base =  g

C) Consider how to prepare a buffer solution with pH = 9.52 (using one of the weak acid/conjugate base systems shown here) by combining 1.00 L of a 0.301-M solution of weak acid with 0.365 M potassium hydroxide.

How many L of the potassium hydroxide solution would have to be added to the acid solution of your choice?

Design a buffer that has a pH of 7.29 using one of the weak base/conjugate acid systems shown below.

D) How many grams of the chloride salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer that is 1.00 M in the weak base?

grams chloride salt of conjugate acid =

grams weak base =

Calculate the pH of a 0.01 M solution of sodium benzoate.

A: Dissociation constant of benzoic acid.

B: Calculate the hydrolysis constant of sodium benzoate.

C: Calculate the pH of the 0.01 M solution.

Explain what is olefin metathesis? in one paragraph