Find the Algebraic answer, absolute uncertainty, and relative uncertainty of:

log [8.47(+/- 0.05)]

I'm having difficulty finding the uncertainty of logarithms and exponents, so showing work would be much appreciated!

Using a symmetry-based approach, construct a complete molecular orbital diagram for OH2. (a) Indicate the HOMO and LUMO. (b) Draw a representation of the HOMO and LUMO. (c) If one were to react this cation with another proton to give the dicationic species [H3O] + explain what would happen to the energies of the orbitals in the OH2 diagram after this reaction. Be specific about the key features regarding the M.O. diagram in the new cation. You do NOT need to write a novel here – 3 or 4 sentences should be enough. Alternatively you can answer this part using a diagram – after all, a picture says a 1000 words.

1. Calculate the molar solubility of HgBr₂ (K_sp= 5.6 x 10^-23) in the following solutions. Be sure to state and justify any assumption you make in solving the problems. Be sure to correct for ionic strength.

1. a saturated solution of HgBr₂
2. 0.025 M Hg(NO₃)₂ saturated with HgBr₂  
3. 0.050 M NaBr saturated with HgBr₂
4. Explain how ionic strength affects the solubility of HgBr₂

If you combine 330.0 mL of water at 25.00 °C and 100.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

Describe the process that takes place between the participants in the neutralization reaction between the strong acid hydrochloric acid, HCl(aq), and water insoluble chromium(III) hydroxide, Cr(OH)₃(s), forming water and chromium(III) chloride, CrCl₃(aq). Mention the nature of the particles in the solution before and after the reaction.

(a) Because hydrochloric acid is  ---Select--- an acid a base a binary covalent compound a binary ionic compound an oxyacid , it reacts with water to form  ---Select--- hydrogen atoms hydronium ions hydroxide ions protons and  ---Select--- chlorate ions chloride ions hydronium ions hydroxide ions .

Because it is  ---Select--- a weak acid a strong acid a weak base a strong base , the reaction is  ---Select--- a chain reaction a completion reaction a reversible reaction a substitution reaction leaving only  ---Select--- hydronium ions hydroxide ions protons and  ---Select--- chlorate ions chloride ions hydrochloric acid molecules water molecules in solution.

(b) Because chromium(III) hydroxide is  ---Select--- a strong base an exception to the solubility rules insoluble in water , it  ---Select--- does not produce any ions produces a small amount of hydroxide ions separates into chromium and hydroxide ions when exposed to water.

The reaction of chromium(III) hydroxide with water is  ---Select--- absent a chain reaction a completion reaction a reversible reaction a substitution reaction .

(c) The instant the two solutions are mixed the solution contains the following particles: (Select all that apply.)

chlorate ionschloride ionschromium hydroxide moleculeschromium ionshydrochloric acid moleculeshydronium ionshydroxide ionswater moleculesnone of the above

(d) When the  ---Select--- chlorate ions chloride ions hydrochloric acid molecules hydronium ions water molecules collide with the  ---Select--- chromium hydroxide molecules chromium ions hydroxide ions water molecules , they react to form  ---Select--- chlorate ions chloride ions chromium hydroxide molecules chromium ions hydronium ions hydroxide ions hydrochloric ions hydrochloric acid molecules water molecules .

This reaction prevents the  ---Select--- chlorate chloride chromium hydronium hydroxide cations from returning to the solid, resulting in the gradual  ---Select--- combustion dissolution eradication precipitation sublimation of the chromium(III) hydroxide solids.

If  ---Select--- a smaller amount of acid than base is equivalent amounts of acid and base are a greater amount of acid than base is mixed together, the  ---Select--- chlorate ions chloride ions hydrochloric acid molecules hydronium ions water molecules and  ---Select--- chromium hydroxide molecules chromium ions hydroxide ions water molecules will completely neutralize each other.

(e) At the end of the reaction the solution contains the following particles: (Select all that apply.)

chlorate ionschloride ionschromium hydroxide moleculeschromium ionshydrochloric acid moleculeshydronium ionshydroxide ionswater moleculesnone of the above

3. Study dehydration synthesis and hydrolysis. Why are these reactions called dehydration synthesis if dehydration means to remove water and synthesis means to build? What do you think happens to large molecules during hydrolysis reactions?

A materials scientist has created an alloy containing aluminum, copper, and zinc, and wants to determine the percent composition of the alloy. The scientist takes a 12.232 g sample of the alloy and reacts it with concentrated HCl. The reaction converts all of the aluminum and zinc in the alloy to aluminum chloride and zinc chloride in addition to producing hydrogen gas. The copper does not react with the HCl. Upon completion of the reaction, a total of 10.1 L of hydrogen gas was collected at a pressure of 739 torr and a temperature of 27.0°C. Additionally, 2.797 g of unreacted copper is recovered. Calculate the mass of hydrogen gas formed from the reaction. mass: g Calculate the mass of aluminum in the alloy sample. mass: g What is the mass percent composition of the alloy? Cu : % Zn : % Al : %

Name and describe at least two instruments that can detect trace amounts of metal elements in a sample.

In addition to maintaining pH, another important consideration when generating a buffer is the ionic strength of a buffer. The ionic strength refers to the number of ions in a solution. Ions help to increase the solubility of species in a solution. How would ions increase the solubility of species in a solution? If the ionic strength of a solution is too high, the species in the solution precipitate. Why?

Draw the Lewis structure for CH2MgBr and give the formal charge of each atom

Explain why one can obtain eigenfunctions for the Hamiltonian operator for the H atom, but can only obtain approximate wavefunctions for multi-electron atoms.