Molar solubility of copper hydroxide in pure water, taken into account that water is adding hydroxide into the solution. Ksp=[Cu^2+][OH^-]^2 = 4.8x10^-20

(x) (1.0x10^-7 +2x)^2 = 4.8x10^-20

1. Why is that during alpha emission, the atomic number decreases by two, and the mass number decreases by four? In your answer yu should consider what alpha particle is?

2. In beta emission, the atom loses an electron, yet the atomic increase by one and the mass number stays the same. How is this possible? It may help if you consider what happen to the number of neutrons and protons.

3. if an element is bombarded by an neutron and subsequently emits a gamma ray, then it follows that the mass number will increase by one. How is it then, the atomic number remains unchanged?

Part A

A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured at 25.0 ∘C is 2.05 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?

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

Part B

If 1.00 mol of argon is placed in a 0.500-L container at 28.0 ∘C , what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)?

For argon, a=1.345(L2⋅atm)/mol2 and b=0.03219L/mol.

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

Discuss the thermodynamic driving force of micelles and bilayer membranes.

What is the limiting reagent in esterification using isopentyl alcohol and acetyl chloride to make isopentyl acetate? Prove your answer with limiting reagent calculations.

Used 200 uL of isopentyl alcohol, 800 uL of acetyl chloride in the experiment.

The enthalpy change under standard conditions for which of the reactions below would be equal to the ∆H°f of NaOH(s)? (A) Na(s) + H2O(l)  NaOH(s) + 1/2 H2(g) (B) Na(s) + 1/2 O2(g) + 1/2 H2(g)  NaOH(s) (C) Na(s) + 1/2 H2O2(l)  NaOH(s) (D) Na+(aq) + OH–(aq)  NaOH(s) please explain why you chose that answer and why the other answers are wrong. If it has to do with them being in their standard states, how do I know what the standard states of the elements are.

When light of wavelength equal to 364 nm strikes a metal, the kinetic energy of the ejected electron is 4.12 × 10-19 J. What is the work function of the metal?

The reaction

Zn(NO₃)₂ + 4NaOH ---> Zn(OH)₄^2- + 2NO^-₃ + 4Na⁺

If 25 mL of a 0.10 M Zn(NO₃)₂ is added to 10.0 mL of 0.65 M NaOH and at equilibrium the concentration of  Zn(OH)₄^2- is found to be 0.012 M, find Kc

Elemental S reacts with O2 to form SO3 according to the reaction

2S+3O2→2SO3

A) How many O2 molecules are needed to react with 4.13 g of S?

Express your answer numerically in units of molecules.

B) What is the theoretical yield of SO3 produced by the quantities described in Part A?

Express your answer numerically in grams.

C) Next, consider a situation in which all of the S is consumed before all of the O2 reacts, or one in which you have excess S because all of the O2 has been used up.

For each of the given situations, indicate whether S or O2 is the limiting reactant.

- 3.00 mol Sulfur, 3.00 mol Oxygen

-3.00 mol Sulfur, 4.00 mol Oxygen

-3.00 mol Sulfur, 5.00 mol Oxygen

I compress an ideal gas under a constant pressure of 3.2 × 105 Pa from 6.31 mL to 5.12 mL.

i. What is the work done in this process?

ii. If this is an adiabatic process, what is q and ∆U for this process?

You have the following solutions at your disposal to prepare a buffer solution with a pH greater than 7.0:

(1) 50.0 mL of 0.35 M NH3 Kb = 1.8×10-5  (2) 55.0 mL of 0.35 M NaOH

(3) 50.0 mL of 0.35 M HCl (4) 16.5 mL of 0.35 M NaCl NaOH

(5) 16.5 mL of 0.35 M HNO3 (6) 16.5 mL of 0.35 M KOH

(a) Assuming that you are going to mix the entire quantity of the listed solutions to prepare the buffer, which two solutions would you use?

Given the provided enthalpies of formation, calculate ΔH for the reaction shown.

2 H₂ (g) + O₂ (g) → 2 H₂O (g)             ΔH = -483.6 kJ

3 O₂ (g) → 2 O₃ (g)                              ΔH = +285.4 kJ

6 H₂ (g) + 2 O₃ (g) → 6 H₂O (g)            ΔH = ?

When 25.00 mL of unknown were passed through a Jones reductor, molybdate ion (MoO₄^2-) was converted into Mo³⁺. The filtrate required 16.43 mL of 0.01033 M KMnO₄ to reach the purple end point.

MnO₄^- + Mo³⁺ → Mn²⁺ + MoO₂²⁺

A blank required 0.01 mL. Balance the reaction. (Use the lowest possible coefficients. Omit states-of-matter.)

Find the molarity of molybdate in the unknown.