Please Show working for the following clearly

4.) Barium hydroxide is reacted with calcium iodide. Calculate how many mL of .30M Ba (OH)2 needed to react with 250mL of .50M Cal2 (Write balanced equation first).

5.) Given the equation; N2 (g) + 3H2(g) (arrow) 2NH3(g). If 7.00L of N2 ( at STP) reacts with 15.0 L of H2, A.) How many L of NH3 is formed? B.) How many L of the excess gas remains unreacted?

C.) How many grams of NH3 are formed?

A.)

B.)

C.)

6.) In the titration, HBr + KOH (arrow) H2O + KBr, if 48.5 mL of 1.5M HBr reached the end point of 50.0mL of the KOH, calculate the molarity of the KOH.

What is the significance of the Fermi wavelength in terms of the optical property of the nanomaterial?

Imagine that a polluter starts dumping sodium chloride into Lake Charles at a rate of 1413.7 kg per day, that the background concentration of NaCl in the lake was 8.3 ppm, and that the residence time of NaCl in the lake is 3.5 years. After 5 years, the Environmental Protection Agency catches on and turns off this source of NaCl. What would be the maximum concentration of NaCl in the lake? Please give your answer in ppm. Lake Charles has a volume of 1.8*107 m3.

the following equilibrium reaction occurs in aqueous solutions when 0.1 M KSCN is mixed with 0.1 M

Fe(NO3)3. Fe(SCN)2+(aq) <----> Fe3+(aq) + SCN-(aq)

Predict whether the following statements (in relation to the above equilibrium reaction in aqueous solution) are "True" or "False".

1.Addition of 0.1 M NaNO3 does not have as much influence on the position of the equilibrium.

2.Addition of 0.1 M KSCN does not affect the position of the equilibrium.

3.Addition of 0.1 M KNO3 causes the equilibrium to shift to the left (reactant side).

4.Addition of 0.1 M Fe(NO3)3 causes the equilibrium to shift to the right (product side).

5.In the addition of 6 M NaOH, OH- reacts with Fe3+ to form slightly soluble Fe(OH)3.

6.Addition of 0.1 M LiSCN will have a similar effect on the position of the equilibrium as the addition of 0.1 M KSCN.

7.Addition of 6 M NaOH causes the equilibrium to shift to the left because NaOH is a strong base and breaks the bonds in Fe(SCN)2+

Describe and explain the bonding (sigma and/or pi interactions) in Fe(NO)₂(CO)₂

The sequence of a polypeptide X is as follows:
THCARKEDSGYPEWANVRDECW

1. The Optical Density (O.D.) at 280 nm of a solution of the above polypeptide X is 0.51 at the standard experimental conditions (i.e. optical length L = 1.0 cm) . What is the concentration of the polypeptide X in this solution (in mM)? (The molar absorptivity (e) for tyrosine and tryptophan residues at 280 nm are 1,400 M^(-1)cm^(-1) and 5,500 M^(-1)cm^(-1), respectively).

2. Estimate the molecular weight of this peptide.

3. Draw side-chain structures and peptide bonds for the first five amino acid residues of the polypeptide X.

Glucose Metabolism can be represented by the following chemical reaction:

C6H12o^(aq) + 6 02 (g) -------------- 6C02 (g) + 6 H20 (i)

H for the reaction is -2837 kj/mole.

A: Is this reaction endothermic or exothermic?

B: Write an expressin for the equilibruim constant is very large, would you expect this reaction to be fast or slow?

C: Given that the value of equilibrium constant is very large, would you expect this reaction to be fast or slow?

D: Explain the effect on equilibrium of

: Increasing temperature

: Increasing pressure by decreasing the volume

: Decreasing concentration of oxygen

: Increasing the concentration of carbon dioxide

How many grams of glucose, C₆H₁₂O₆, must be dissolved into 394.7 g of water at 100°C to reduce the pressure of water above the solution to 686.4 mm Hg? The solute is a non-volatile compound.How many grams of glucose, C₆H₁₂O₆, must be dissolved into 394.7 g of water at 100°C to reduce the pressure of water above the solution to 686.4 mm Hg? The solute is a non-volatile compound.

Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)→NO2(g), ΔH∘A=33.2 kJ 12N2(g)+12O2(g)→NO(g), ΔH∘B=90.2 kJ

A. Draw a seperatory funnel with isopropyl acetate and aqueous solution in it. Label the layers. Which is the top and which is the bottom and why is this so? What property of each liquid determines if it will be the top or the bottom layer.

B. What properties of the compounds is this separation based on? Which of the two (Benzoic acid and ethyl-4-hydroxybenzoate) is more acidic?

C. Which of the two compounds is extracted into the aqueous layer with sodium bicarbonate extraction? Why is this so?

Why is it possible for more than one mechanism to be consistent with the experimentally determined rate law for a hemical reaction?

A 35.0-mL sample of 0.150 M acetic acid (CH3COOH) is titrated with 0.150 MNaOH solution. Calculate the pH after the following volumes of base have been adde

Part A

35.5 mL

Express your answer using two decimal places

Part B

50.0 mL

Express your answer using two decimal places

A 10.0 mL solution of 0.030 M AgNO3 was titrated with 0.015 M NaBr in the cell. S.C.E. || titration solution | Ag(s) Find the cell voltage for 0.4, 10.0, 20.0, and 27.0 mL of titrant. (The Ksp of AgBr = 5.0 ✕ 10−13.) 0.4 V 10.0 V 20.0 V 27.0 V

A solution is prepared by dissolving 32.5 g of a nonvolatile solute in 200 g of water. The vapor pressure above the solution is 21.85 Torr and the vapor pressure of pure water is 23.76 Torr at this temperature. What is the molecular weight of the solute?

You are asked by your new boss to prepare 750 ml of a 0.5M pH 8.4 tris- (hydroxymethyl) amminomethane (Tris) buffer. The Tris base is provided in the solid form (mol. wt. 121.1 g/mole, pKa 8.1). You are also supplied with solutions of 0.5 M HCl and 0.5M NaOH. Explain how you would prepare this buffer.