Calculate the quantity of energy produced per mole of U -235 (atomic mass = 235.043922 amu ) for the neutron-induced fission of U -235 to produce Te -137 (atomic mass = 136.9253 amu ) and Zr -97 (atomic mass = 96.910950 amu ).

At 700 K acetaldehyde decomposes in the gas phase to methane and carbon monoxide. The reaction is:
CH3CHO(g)→CH4(g)+CO(g)
A sample of CH3CHO is heated to 700 K and the pressure is measured as 0.43 atm before any reaction takes place. The kinetics of the reaction are then followed by measurements of total pressure and these data are obtained:

Question:

Find total pressure after 1.39×10⁴ s .

1. What is the pH of pure water?

2. What is the change in pH when 10.0 mL of 0.010 M HCl is added to 500 mL of pure water.

3. What is the change in pH when 10.0 mL of 0.010 M NaOH is added to 500 mL of pure water.

Items are sometimes fastened to plastic parts by screw driven into smooth holes molded in the parts. Over time, however, the screws loosen. To what common laboratory test of viscoelasticity does this correspond? (Provide explanation)

If 5.01 g of Ag2O is sealed in a 75.0-mL tube filled with 760 torr of N2 gas at 24 ∘C, and the tube is heated to 380 ∘C, the Ag2O decomposes to form oxygen and silver.

What is the total pressure inside the tube assuming the volume of the tube remains constant?

Express your answer to three significant figures and include the appropriate units.

1. For each of the following terms, write a sentence that properly uses one or more terms in context; underline the term(s) used in each sentence: Chemical reaction Products (of a chemical reaction) Dependent variable (of data collection) reactants (of a chemical reaction) aerobic cellular respiration independent variable (of data collection)

Provide 3 reasons why refluxing is a useful technique as opposed to heating a reaction solution in a temperature bath to perform a reaction

You are asked to prepare a pH=4.00 buffer starting from 1.50 L of 0.0200M solution of benzoic acid (C6H5COOH) and an excess of sodium benzoate (C6H5COONa).

Part A

What is the pH of the benzoic acid solution prior to adding sodium benzoate?

Express your answer using three significant figures.

Part B

How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added.

Express your answer using two significant figures.

The largest use of nitric acid is in the reaction with ammonia to produce ammonium nitrate for fertilizer.

A) If 275.0 g of nitric acid reacted with 156.5 g of ammonia, what is the limiting reagent?

B) How many grams of ammonium nitrate would be produced?

C) If only 300 g of ammonium nitrate was produced, what is the percent yield?

A 200.0 mL buffer solution is 0.260 M in acetic acid and 0.260 M in sodium acetate.

1) What is the initial pH of this solution?

2) What is the pH after addition of 0.0100 mol of HCl?

3) What is the pH after addition of 0.0100 mol of NaOH?

How do you find E^o of a cell?

Is the formula E^o cell= cathode - anode?
Or is it E^o= Oxidation + Reduction?

i am very confused as to when I should add the cell potentials together and when I should subtract. If at all possible, please provide examples!

Particle in a box: given the number of carbon atoms, and the wavelength. How do I find the highest filled orbital, the lowest unoccupied orbital, and the box length. (ex. # of C atoms = 4, wavelength = 508.9nm. HFO = ?, LUO= ?, Box length = ?nm

L=√[(hʎ/8mc) (n^2-n^2 )] I believe I need to use this equation to find the box length. I just don't know how to find what the n values are.

Briefly describe all the roles played by complementary base pairing in:

1) DNA replication

2) Transcription

3)Translation

The initial rates listed in the following table were measured in methanol solution for
the reaction: A + 2 B + C ↔ 2 D + 2 E

Write the rate law for the reaction.

What is the numerical value of k? (don’t forget to include the units)