After thoroughly reviewing the octet rule, respond to the following: Discuss the octet rule and why there are exceptions to the rule. Give examples of the rule and of exceptions written in 250 words minimum

LCAO: Determine which of the following statements are true of a 2p atomic orbital

Which of the following statements are true of a 2p atomic orbital? You may find the Orbitron page for the 2p orbital useful.

Consider the reaction that results from the addition of 50.0 g of Zinc metal (Zn) to 60.0 g of hydrochloric acid (HCl)? Generate a balanced equation for this reaction and then answer the folling (3) questions.

1) What is the limiting reactant?

A) zinc

B) hydrochloric acid

C) zinc chloride

D) hydrogen gas

E) hydrogen gas

2) How much hydrogen gas forms?

A) 2.68g

B) 0.77g

C)0.83g

D) 8.35g

E) 1.55g

3) How much excess reagent is left over?

A) 4.26g

B) 22.13g

C) 11.9g

D) 9.43g

E) 4.35g

HWW Item 810

Part A

Titanium reacts with iodine to form titanium(III)iodide, emitting heat.
2Ti(s)+3I2(g)→2TiI3(s)ΔHorxn = -839 kJ

Determine the masses of titanium and iodine that react if 1.50×10³ kJ of heat is emitted by the reaction.Express your answer to three significant figures and include the appropriate units.

m(Ti)= (value)(unit)

m(I2)= (value)(unit)

Part B

Consider the following generic reaction: A+2B→C+3D, with ΔH = 128 kJ . Determine the value of ΔH for each of the following related reactions.

a) 3A+6B→3C+9D

ΔH = _____ kJ

b) C+3D→A+2B

ΔH = _____ kJ

c) 1/2C+3/2D→1/2A+B

ΔH = _____ kJ

Starting with 6.9 mL of acetic anhydride with a density of 1.082, how many grams of acetylsalicylic acid (theoretical yield) can be made? Assume acetic anhydride is the limiting reagent and a one to one stoichiometry. Give two significant digits.

Calculate the Molar solubility at 25 degrees clelcius of Cr(OH)3 In:

Water:

1.50 M Cr(NO3)3:

A solution buffered to 10.50:

(please include all of the steps)

HEPES, 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid, is a diprotic acid often used to

create buffers compatible with biological samples. A 10.0 mL sample of HEPES was titrated with

0.100 M NaOH.

a. To 2 places past the decimal point, determine the values of pKa1 and pKa2 for HEPES

b. Calculate the initial molarity of the HEPES solution to 4 sig figs.

c. A 20.0 mL portion of 0.20 M HEPES is titrated with 0.100 M NaOH. Calculate the pH at the first

and second equivalence points of the titration.

Correct calculation

A) How many moles of silver are in a 100. G sample?

B) Isoquinoline has the molecular formula C9H7N. Its molar mass in g/mol is:

c) Given the combustion of propane

C3H8 + 5O2 => 3CO2 + 4H2O

How many grams of oxygen are required to burn 8.8 grams of C3H8? (Molar masses in grams per mole- propane: 44.2; oxygen: 31.99; carbon dioxide: 44.01; water: 18.02)

A voltaic cell employs the following redox reaction: 2Fe3+(aq)+3Mg(s)→2Fe(s)+3Mg2+(aq) Calculate the cell potential at 25 ∘C under each of the following conditions.

A) [Fe3+]= 1.9×10−3 M ; [Mg2+]= 2.80 M

B) [Fe3+]= 2.80 M ; [Mg2+]= 1.9×10−3 M

What is the expected aromatic hydrocarbon reactivity of these compounds and why ? (which is the fastest and which is the slowest and why?) a bromine solution in acetic acid was added to these compound.

Toluene , Acetanilide , Benzhydrol, Anisole, Diphenyl ether

What is the basic structure of lecithins, and how do they work as emulsifiers, and in membranes?

Calculate the solubility of Mn(OH)2 in grams per liter when buffered at pH=7.0, 9.8, 11.8. Assume that buffer capacity is not exhausted.