Write the complete redox and the two half-reactions for the reaction of aluminum and copper. Which species is oxidizing agent? The reducing agent? How many electrons were transferred?

A compound containing xenon and fluorine, Xex,Fy, was produced by shining bright sunlight on a gaseous mixture of 0.439 g of Xe and excess fluorine. If all the xenon reacts, and 0.693 grams of the compound are formed, what is the empirical formula of the compound?

A 0.158 gram sample of a salt, comprised of barium and one of the halide ions, was dissolved in water, and an excess of sulfuric acid was added to form barium sulfate, BaSO4. After filtering and drying, the solid BaSO4 weighed 0.124 grams. Determine the identity of the halide and the formula of the barium halide.

At 2300 K the value of K of the following reaction is 1.5 x 10^-3:

N₂(g) + O₂(g) ↔ 2NO(g)

At the instant when a reaction vessel at 2300K contains 0.50M N₂, 0.25M O₂, and 0.0042M NO, by calculation of the reaction quotient (Q), is the reaction mixture at equilibrium? If not, in which direction will the reaction proceed to reach equilibrium?

The value of Kc for the reaction:

N₂O₄(g) ↔ 2NO₂ (g)

is 0.21 at 373K. If a reaction vessel at that temperature initially contains 0.030M NO₂ and 0.030M N₂O₄, what are the concentrations of the two gases at equilibrium? First, the reaction quotient (Q) [page 645 of textbook] must be calculated, and then use the I.C.E table [page 648-650 of the textbook] to determine the equilibrium concentrations.

Assuming 100% yield, how much hexynyl lithium is produced from the reaction that you performed in the lab of LiMDS with 1-hexyne (0.22 mL)? Using 1 mL of 1.0 M lithium bis(trimethylsilyl)amide solution in THF and 0.22 mL of 1-hexyne. (1‐hexyne density = 0.71 g/mL).Show all work .

what is pH of 15.0g KH2PO4 + 27.0 g Na2HPO4 dissolved in H2O plus enough H2O to fill to 1L

Subtract/Multiply/Divide using Significant figures

1.

(16.75 - 6.2) x (9.56 x 10^-19)

------------------------------------------

(6.75^3.2) x (8.5679 x 10¹¹)

This is just one problem, just dividing it

2. Convert 9.64 x 10¹⁴ pm³ to nanometers

Calculate the pH of a solution formed by mixing 65 mL of 0.16 M NaHCO3 with 75 mL of 0.29 M Na2CO3. Express your answer using two decimal places.

Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.40 μg Co/mL and 1.35 μg Ti/mL measured by AAS produced a signal-to-signal ratio of 2.41 Ti: 1.00 Co. A mixture was prepared by combining 4.50 mL of a Ti(IV) solution of unknown concentration with 4.00 mL of a 14.1 μg/mL solution of Co(II). The absorbance of the mixture at the Ti(IV) wavelength was 0.175 and the absorbance at the Co(II) wavelength was 0.187. Determine the concentration, in moles per liter, of Ti(IV) in the original unknown solution.

Calculate the pH of a mixture that contains 0.13 M of HNO3 and 0.20 M of HC6H5O.

Explain the purpose of the components of an acrylamide gel.

Why is it impossible to measure an excimer absorption spectrum, even for highly concentrated solutions? Illustrate your answer with an energy diagram

Consider these liquids.

Dishwashing detergent: 1.03 density g/mL

Maple syrup: 1.37 density g/mL

Vegetable oil: 0.91 g/mL

a. if you pour equal volumes of these three liquids into a 250 milliliter graduated cylinder, in what order will you add the liquids to create three separate layers? Explain your reasoning.

b. If a liquid were poured into the cylinder and it formed the layer that was on the bottom of the other three layers, what can you tell about one of the properties of this liquid?

c. what would happen if a volume of water equal to the other liquids report into the cylinder and part A and then the contents were mixed vigorously? Please explain.

Please explain the science behind municipal water treatment including chlorination and alternatives to chlorination (UV radiation, etc).

1.) A voltaic cell utilizes the following reaction and operates at 298 K:
3Ce4+(aq)+Cr(s)→3Ce3+(aq)+Cr3+(aq).

What is the emf of the cell when [Ce4+]= 1.3×10−2 M ,[Ce3+]= 2.6 M , and [Cr3+]= 1.7 M ?

2.)Calculate the equilibrium constant K at 298 K:

Aqueous iodide ion is oxidized to I2(s) by Hg22+(aq)

In acidic solution, copper (I) ion is oxidized to copper (II) ion by nitrate ion

In basic solution, Cr(OH)3(s) is oxidized to CrO2−4(aq) by ClO−(aq)

Part A

As a technician in a large pharmaceutical research firm, you need to produce 150. mL of a potassium dihydrogen phosphate buffer solution of pH = 7.00. The pKa of H2PO4− is 7.21. You have the following supplies: 2.00 L of 1.00 M KH2PO4 stock solution, 1.50 L of 1.00 M K2HPO4 stock solution, and a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution? (Assume additive volumes.) Express your answer to three significant digits with the appropriate units.

Part B

If the normal physiological concentration of HCO3− is 24 mM, what is the pH of blood if PCO2 drops to 24.0 mmHg ?

Express your answer numerically using two decimal places.