Perhaps the most central concept in amino acid degradation is that some amino acids are glucogenic, some are ketogenic and some are both glucogenic and ketogenic. Which of the following amino acids is both glucogenic and ketogenic?

A. Arg

B. Ile

C. Leu

D. Asn

E. Cys

find the pH of a 40 mL buffer solution + 1.0 mL of 6.0 M HCl (aq)

I know this question is pretty simple, but do I need to know what the buffer is made of? Is it important? if not how would I set up the ICE table? thank you!

a) A buffer contains significant amounts of hydrofluoric (HF) and sodium fluoride (NaF). Write the net ionic equation showing how this buffer neutralizes added HNO3. Express your answer as a chemical equation. Identify all of the phases in your answer

b) Write the net ionic equation showing how this buffer neutralizes added KOH. Express your answer as a chemical equation. Identify all of the phases in your answer

Devise a synthesis of 5-methyl-1-hexyne using one of the starting materials and any of the reagents below using the fewest steps possible. If you need fewer than the 3 steps allowed, enter "none" for reagents in the remaining unused steps.

Starting Materials:

(1.) HC(triple bonded)CH

(2.) HC(triple bonded)C-CH₃

(3.) HC(triple bonded)C-CH₂CH₃

(4.) HC(triple bonded)C-CH₂CH₂CH₂CH₃

(5.) HC(triple bonded)C-CH(CH₃)(CH₃)

(6.) HC(triple bonded)C-C(CH₃)(CH₃)(CH₃)

Reagents:

a. NaNH₂/NH₃ (l)

b. NaOH/H₂O

c. iodomethane

d. idoethane

e. 1-bromopropane

f. 2-bromopropane

g. 1-bromo-3-methylbutane

h. t-butyl bromide

i. H₂/ Pd on Carbon

Answer the following:

Starting Material:

Reagent for step 1:

Reagent for step 2:

Reagent for step 3:

** ALSO, PLEASE ANSWER THE SAME QUESTIONS USING: (Z)-4,4-dimethyl-2-pentene AND (E)-3-octene (Instead of 5-methyl-1-hexyne)

How many milliliters of 0.120 M NaOH are required to tritrate 50.0 mL of 0.0998 M hydrochloric acid to the equivale point the Ka of hypochlorous acid is 3.0×10^-8. What is the pH after the NaOH is added?

when 1.0 mol of NO(g) forms from its elements, 90.29 kJ of heat is absorbed. How much heat is evolved when 5.40 g of NO decomposes to its elements?

A sample of 7.5 L of NH3 gas at 22 ∘C and 735 torr is bubbled into a 0.50-L solution of 0.40 M HCl. Assuming that all the NH3 dissolves and that the volume of the solution remains 0.50 L, calculate the pH of the resulting solution.

An aqueous solution of ethyl acetate at room temperature has an itial concentration of 0.15 M. Calculate the equilibrium concentrations of ethyl acetate (CH3COOC2H5), ethanol (C2H5OH) and acetic acid if the equilibrium constant at this temperature is Kc= 3.00. Part B. Repeat this calculation for initial ehtyl acetate concentrations of 0.25 M and 0.35 M. Are your answers in agreement with Le Chatelier's Principle?

1 Define the term “distillation.”

2 Write an equation to exemplify Dalton’s Law.

3 Maximum boiling azeotropes differ from minimum boiling azeotropes in what significant way?

4 Define the term “reflux.”

5 Draw a sketch of a fractional distillation setup. Be sure to show where external support is necessary.

please answer all 5 questions

Yeast make alcohol in the absence of oxygen by a process called fermentation (i.e., anaerobic respiration). Complete fermentation of one of the sugar glucose (C₆ H₁₂ O₆) will generate two moles of ethanol (C₂ H₆ O), two moles of carbon dioxide (CO₂) gas, and tow moles of the important molecule ATP (C₁₀ H₁₆ N₅ O₁₃ P₃), using in cellular transfers. You perform an experiment to make alcohol, so you set up an anaerobic fermentation system using yeast. You add 135 grams of glucose to your system and allow the sugar to be fermented to completion, trapping all fermentation products. (a) How many molecules of ATP were produced in your experiment? What is the total mass of the ATP. (b) The volume of the fermenation tank was 15 Liters, and the temperature was kept constant during the experiment at 25 ⁰C. Is it possible to determine the final tank pressure of the CO₂ gas produced by this experiment? Will the Ideal Gas Law work here? (c) What was the total volume of ethanol produced in this experiment? The density of ethanol is 0.789g/mL.

What is the pH of a 5.4× 10–8 M solution of HCl(aq) at 25 °C? Report your answer to the hundredths place.

Effective nuclear charge is:

A-	the amount of attraction between electrons of two different atoms.

B-	the amount of attraction that an electron "feels" for the nucleus.

C-a nuclear explosion that effects global warming.

D-the difference between the number of protons and electrons in an atom.

E-the repulsion that occurs among core electrons.

Write unbalanced half-reactions for the following net ionic equations.

Part A MnO4−(aq)+IO3−(aq)→MnO2(s)+IO4−(aq) Express your answers as chemical expressions separated by a comma. Enter the reduction half-reaction first. Identify all of the phases in your answer.

Part B NO3−(aq)+SO2(aq)→SO42−(aq)+NO2(g) Express your answers as chemical expressions separated by a comma. Enter the reduction half-reaction first. Identify all of the phases in your answer.

Acetone, the solvent in many nail polish removers, has a density of 0.791 g/mL. What is the volume, in mL, of 38.2 g of acetone?An automobile gasoline tank holds 31.0 gal when full. How many pounds of gasoline will it hold if the gasoline has a density of 0.737 g/mL?

The following work-up steps are part of our second synthesis (“Hydrogenation of a Chalcone”).

a) Add 15 mL of brine and 10 mL of ethyl acetate to the mixture. Shake vigorously, then separate the ethyl acetate layer from the aqueous phase.

b) Extract the aqueous phase again with an additional 5 mL of ethyl acetate.

c) Combine the two ethyl acetate solutions and wash this ethyl acetate layer with 5

mL of brine. Drain the aqueous phase and pour the ethyl acetate solution into a

clean 25-mL Erlenmeyer flask.

d) Dry the organic phase with anhydrous magnesium sulfate for 5 min.”

Which (if any) changes to the outcome of the work-up would you expect for each of the following changes to the procedure?

i) In step a), replace ethyl acetate with hexane.

ii) Omit step b).

iii) In step c), use water instead of brine.

iv) Omit step d).