Chemistry Questions

Consider the following compounds: 1-butyne, 2-pentyne, 3-hexyne and 3- Nonyne
Explain which compound will have the weakest Acetylenic C-C Infrared absorptions provide a reason for your answer.
2. Consider 3 solutions of CH3CH2OH in a nonpolar IR inactive solvent . Each solution has a differrent Molarity. After IR spectroscopy, would the position of the stretch of the oxygen–hydrogen bond depend on the concentration of the alcoholic solutions?
3. Predict the diagnostic signals for compounds A and B below, and identify the functional groups responsible for that signal? Ignore signals in the fingerprint area
4. See attached, then answer the following:
1) Identify the functional group responsible for the IR spectrum given below.
2) Identify the IR signal that is diagnostic for your interpretation, explain your answer.

Organic chemistry e×am

the e×am is 1 hour long. Our instructor allows us to see the previous year’s e×am so I have attached the answer key to that. Expect the e×am to cover the same topics and be the same length or possibly shorter. Once the e×am begins, I will send you the file and I will need the answers sent back an hour after I send it to you. It is best if you print out the entire e×am and write on it, then send back a PDF scan of the answers. My submission must be exactly as long as the e×am and the questions must be answered on the pages that they were assigned. If you prefer to answer the questions on a blank sheet of paper rather than printing it, the questions must be answered on their respective pages. For example, if question 4 was given on page 6, then on the 6th page of the submission, question 4 must be present. a cover page must also be included, similar to the first page of this attachment. This headache can be avoided if you just print the e×am and write directly on it. IF YOU ARE NOT FAMILIAR WITH ANY OF THE TOPICS IN THE ATTACHMENT, THEN DO NOT ACCEPT THIS QUESTION. thank you.

calculating percent yield for copper.

If you need to produce 3.50 kg of copper metal from a contaminated sample of reclaimed copper wiring, which is 68.3% copper, how many kg of reclaimed copper wiring would you need to
buy if your percent yield at each step is 90%? Assume that you will isolate the copper wiring by
going through the steps in this lab. Be sure to show all stoichiometry used.2. How might you prepare (in one step) copper(II) nitrate from copper(II) chloride? Include in
your answer: the reagent that you would add, a description of the equation that would take
place, and an explanation of how you would then isolate the pure copper(II) nitrate from the
reaction mixture.3. How might you prepare (in one step) copper(II) hydroxide from copper(II) sulfate? Include in
your answer: the reagent that you would add, a description of the equation that would take
place, and an explanation of how you would then isolate the pure copper(II) hydroxide from the
reaction mixture. Please show all work that is needed to solve the question listed.

You will be writing on the element Helium.

doc ProjESu21.doc – Alternative Formats (46.5 KB)
To: CHM 1010 students
You will write a report on the element assigned to you by email. For this element, you will provide the information listed and additional information as specified in the attached document. You will submit a Microsoft Word file of your project – on the Word file, the softcopy, the hyperlinks must be hot! (they must work!!)
You will submit the softcopy to your course Blackboard site, using SafeAssign to check for plagiarism. You will be allowed a maximum of 3 submissions; your last submission will be graded.To submit your assignment, click on the “Element Project” link above.
The points for your project will be as follows:
5 – Table data
5 – Table citations, references
5 – Text, proper citations
5 – Bibliography or list of references, correct format
5 – Softcopy, hyperlinks
25 – Cover page, narrative text (neatness, originality, avoidance of plagiarism, etc.)
50 – Total points

organic chem I E3

E2; Substitution vs. Elimination
Alcohols, ethers, epoxides
Nomenclature, properties, Preparation and reactions of alcohols,
Dehydration of alcohols; carbocation
rearrangements; conversions of alcohols to alkyl halides,
Tosylate; reaction of ethers and
epoxides; Alkenes preparation and reactions
(addition, Markovnikov’s rule), Halogenation of alkenes; halohydrin
formation; hydroboration
Alkynes: nomenclature, physical
properties, Alkyne: preparation and addition
reactions, Halogenation, hydration,
hydroboration oxidation, reaction of acetylide anions; synthesis
oxidation and reduction reactions, Reduction of alkenes and alkynes;
reduction of polar C-X bonds; oxidizing
agents; epoxidation, Dihydroxylation; oxidative cleavage of
alkenes; oxidation of alcohols;
Sharpless Epoxidation

I have this question and need all parts answered please. It is for general chemistry

3.80 mL of ethanol were allowed to burn in the presence of 12.5g of oxygen gas. 3.10 mL of water were collected (density of water is 0.9989g/mL). Balance the chemical reaction. Determine the limiting reagent, theoretical yield, percent yield. Based on your percent yield, how much should you burn to produce 5.00 mL of water? Density of ethanol is 0.789g/ml

Chemistry Question

I have a set time frame of 1 hour and 45 minutes and in that time frame, I will be sending screenshots of the questions to you while you answer and send them back. The topics being covered are:
– Kinetics
– Equilibrium
– Acid and Base

Spectroscopic Analysis

-watch the following 2 minutie video-
-read the article experiment handout and finish the table in it
answer the questions below
then fill out the post lab table for possible unknowns
Spectroscopic Analysis-1
a.Which of the following statements regarding IR spectroscopy is wrong?
Infrared radiation is higher in energy than UV radiation.
Infrared spectra record the transmission of IR radiation.
Molecular vibrations are due to periodic motions of atoms in molecules, and include bond stretching, torsional changes, and bond angle changes.
Infrared spectra give information about bonding features and functional groups in molecules.
b.Which is the correct order of decreasing wave number of the stretching vibrations of (1) C-H (alkane), (2) C-H (alkene), (3) C-H (alkyne), and (4) C=O?
(1) > (2) >(3) >(4)
(4) < (3) < (2) < (1)
(3) < (4) ≈ (2) < (1)
(1) < (4) <(2) < (3)
c. To check that a secondary alcohol has been completely oxidised to a ketone you can…
check that the IR spectrum has no absorption around 3500cm-1
check that the IR spectrum has absorptions at 3500cm-1 and 1650cm-1
check that the IR spectrum has no absorption around 1650cm-1
check that the IR spectrum no absorptions at 3500cm-1 and 1650cm-1
d.Proton nmr is useful for investigating the structure of organic compounds because…
organic compounds contain carbon atoms
organic compounds are mostly covalent
hydrogen atoms are found in nearly all organic compounds
organic compounds have low boiling points
e.Which of the following statements about tetramethylsilane is incorrect? it produces a single peak at 10ppm
it is inert
it is volatile and can be easily distilled off and used again
it is used to provide a reference against which other peaks are measured
f.What is the predicted multiplicity of the indicated protonin the 1H NMR spectrum?
Septet of triplet
quartet of doublet
quartet of triplet
quartet of setet
g.In a triplet, the relative peak areas are in the ratio…
h.The proton nmr of 2-bromo-2-methylpropane will consist of…
three quartets and a singlet
two doublets and a singlet
two singlets
one singlet
i.Which one of the following pieces of information cannot be obtained from an infra-red spectrum?
Presence or absence of C=O
Presence or absence of O-H
The molar mass of the molecule
the identity of a compound through comparison with other spectra
j.The isomer of C4H8 which produces an nmr spectrum with four different signals is…