Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions. Express in inverse seconds.

a) n=4?n=3

b) n=5?n=1

c) n=5?n=4

d) n=6?n=5

What is the strongest interparticle force in each of the five compounds: KMnO4, sucrose, Iodine, NiSO4 6H2O, naphthalene? What relationship exists between the IMF and the solubilities?

What are the relative pKas of strong electrophiles vs. strong nucleophiles? Please explain the difference between electrophiles and nucleophiles.

For an incident gamma-ray interacting with an inorganic scintillator, describe the interaction of the gamma-ray, how scintillation light is generated, how it is converted into an electrical signal, and how it is amplified.

write orbital diagram for each ion and determine if the ion is diamagnetic or paramagnetic.

a. Cd²⁺ b.Au⁺ c.Mo³⁺ d. Zr²⁺

Provide your answer: example :paramagnetic, diamagnetic, etc., accordingly to a, b, c,and d.

The equilibrium constant (Ka) for benzoic acid is 6.46 x 10^-5.

Calculate the ratio of benzoic acid to benzoate ion in solution pH=2.00. Then calculate the same ratio at pH=4.00.

A 280.0mL buffer solution is 0.220M in acetic acid and 0.220M in sodium acetate.

A. What is the initial pH of this solution?

B. What is the pH after addition of 0.0050mol of HCl?

C. What is the pH after addition of 0.0050mol of NaOH?

What element is being oxidized in the following type of reaction 4 PBr3 (l) > P4 (s) + 6 Br2 (l)?

A. P or Br

How to draw syndiotactic triad of poly(methyl methacrylate) and benzoyl peroxide initiator?

Consider the titratkon of 50.0 mL of 0.200 M HC₂H₃O₂ (K_a = 1.8 x 10^-5) with 0.100 M NaOH.

(A.) Calculate the pH of the HC₂H₃O₂ before the addition of NaOH

(B.) Calculate the pH of the solution after the addition of 20.0 mL of 0.100 M NaOH.

(C.) Calculate the pH of the solution after the addition of 50.0 mL of 0.100 M NaOH.

(D.) Calculate the pH of the solution after the addition of 100.0 mL of 0.100 M NaOH.

(E.) Calculate the pH of the solution after the addition of 150.0 mL of 0.100 M NaOH.

AP Chemistry Algorithmic Question 27

Part A

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide:
2Mg(s)+O2(g)→2MgO(s)
When 5.50 g of magnesium burns, the theoretical yield of magnesium oxide is ________ g.

Part B

If the percent yield for the following reaction is 75.0%, and 40.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq) are produced?
3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Part C

Balance the chemical equation given below, and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 9.00 g of oxygen at 25°C. The density of nitrogen monoxide at 25°C is 1.23 g/L.
________ NH3(g) + ________ O2(g) →________ NO(g) + ________ H2O(l)

A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume in mL of household bleach that should be diluted with water to make 500.0 mL of a pH = 9.80 solution.

Compute the pressure in bar of hydrogen gas produced at 311 K in a container of volume 1.59 L that results when 2.34 g of aluminum react with 103 mL of a 0.359 mol L^-1 sulfuric acid solution.
You must write the chemical equation, balance it, work the stoichiometry problem and finally use the ideal gas law. The reaction produces aluminum sulfate and hydrogen gas.

P = _____________bar