Organic Chemistry Questions

Cellulose is a polysaccharide which has A. only beta-1,4-bonds between glucose units B. only alpha-1,4-links bonds glucose units C. hemiacetal links joining glucose units D. both alpha-1,4- and bonds between glucose units

Show the molecular equation, ionic equation and the net ionic equation for the following equations. If all species are spectator ions, please indicate that no reaction takes place. Note: Be sure the original equation is balanced before proceeding! 1. AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq) 2. Mg(NO3)2(aq) + Na₂CO3(aq) → MgCO3(s) + NaNO3(aq) 3. strontium bromide (aq) + potassium sulfate(aq) → strontium sulfate(s) + potassium bromide (aq) 4. manganese (II) chloride (aq) + ammonium carbonate(aq) → manganese(II)carbonate(s) + ammonium chloride (aq) 5. chromium(III)nitrate(aq) + iron(II)sulfate(aq) → chromium(III)sulfate(aq) + iron(II)nitrate(aq)

Humans cannot digest cellulose because they A. lack the necessary enzymes to digest beta-glcosides B. cannot digest chlorophyll C. are poisoned by beta-glycosides D. are allergic to beta-glycosides E. have intestinal flora which use up beta-glycosides

A monosaccharide that contains six carbon atoms, one of which is an aldehyde group, is classified as a(n) A. ketotetrose B. aldohexose C. aldopentose D. ketopentose E. aldotetrose

In the L-isomer of a Fischer projection of a monosaccharide, the -OH group furthest frm the carbonyl is written A. on the left of the bottom chiral carbon B. on the right of the bottom chiral carbon C. on the right of the top chiral carbon D. on the left of the top chiral carbon E. on the left of the middle chiral carbon

What are antibodies? Y-shaped proteins that recognize and help destroy foreign substances proteins on cell surfaces that identify the cell as self cells that engulf pathogens that were marked for destruction foreign substances whose presence triggers an immune response

Ketones typically have a carbonyl stretching frequency around 1715 cm-¹. a. Provide an explanation why the C-O group of 4-methoxychalcone has a stretching frequency of 1650 cm-¹

With respect to the Na+/K+ ATPase, it is not an antiport it helps balance a cell's osmotic pressure it is electroneutral it uses a proton gradient for energy all of the above are true none of the above are true

Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. excited state: 1s22s²2p⁰3s¹

Draw the skeletal ("line") structure of methylcyclopropane.

Please provide a mechanism for the following transformation. You may use general base, B, and general acid H+ in your answer. note: tributyl phosphine is a catalyst in this reaction

Suppose all the hydrogen atoms in this molecule are replaced by chlorine atoms: Draw a skeletal ("line") structure of the new molecule. Be sure you follow all the usual rules for drawing skeletal structures.

Suppose all the chlorine atoms in this molecule are replaced by hydrogen atoms: Draw a skeletal ("line") structure of the new molecule. Be sure you follow all the usual rules for drawing skeletal structures.

Predict the product(s) when each of the following are reacted with mCPBA, making sure to indicate the relative stereochemical outcome. Indicate any racemic mixtures by drawing both enantiomers.

Select all the solvents/solutions in which you would expect this compound to dissolve: Ethyl acetate Dilute aqueous sodium bicarbonate Dilute aqueous NaOH Dilute aqueous HCI

Draw the skeletal ("line") structure of cis-5-methyl-2-hexene.

Which of the following sets of elements contain all transition elements? Cobalt, Rhodium, Gold, and Mercury Silicon, Germanium, lodine, and Lead lodine, Xenon, Antimony, and Indium Helium, Calcium, Radium, and Beryllium

Predict the number of signals expected in the H NMR spectrum of each molecule below Ignore signal splitting.

An unknown compound is not symmetric, has a molecular formula of C5H10O and contains a functional group attached to a 3º carbon. It has broad absorption band in the 3200 - 3550 cm-¹ region and no absorption in the 1620 - 1690 cm-¹ region. What is the structure for this compound?

With respect to electron transport, the Q cycle requires both cytochrome C and complex II protons are pumped out of the matrix in four places oxidation of Cu+2 produces Cu+1 all of the above are true

Draw the skeletal (line-bond) structure of 3-bromohexane.

With respect to metabolites made from cholesterol estrogens are derived from androgens it includes vitamin D, but not vitamin A they do not include the prostaglandins all of the above are true none of the above are true

Why is the ammonium salt of lidocaine used rather than the amine? The ammonium salt (lidocaine hydrochloride) is in water and body fluids than the amine lidocaine.

Ionic nomenclature introduces the idea of a cation and anion. Ionic compounds like barium chloride, BaCl2 or aluminum sulfate, Al2(SO4)3 are partnership between opposite charges where all "+" cations and "-" anion charges balance to equal zero. Ba²+ + CI- + Cl- has a net charge of zero and Al³+ + Al³+ + SO42- + SO4²- + SO4²- has a net charge of zero BaCI2 Al₂(SO4)3 Question 1: why would BaCl not be a netural compound?

Which of the following is the major product of the reaction of 1-propanol with a strong oxidizing agent?

A student weighs out 4.66 g of benzaldehyde (C6H5CHO) to react with sodium borohydride (NaBH₂) according to the following chemical equation: C6H5CHO + NaBH4 → C6H5CH₂OH To ensure complete consumption of benzaldehyde, 1.5 equivalents of NaBH4 are used. Calculate how many grams of NaBH, are needed. (MW_C6H5CHO = 106.12 g/mol; MW_NaBH4 = 37.83 g/mol)

What is the IUPAC name of the following ether? CH3-CH2-CH₂-CH2-O-CH3 2-methoxybutane 1-butoxymethane butyl methyl ether 1-methoxybutane

With respect to regulation of cholesterol synthesis, when cholesterol is high, HMG-CoA reductase is allosterically inhibited it is allosterically controlled by ketone bodies it is controlled by regulating oxidation of acetyl-CoA all of the above are true none of the above are true

How many molecules of SO3 can be formed from 0.74 moles of O₂ (assuming excess SO₂) from the following UNBALANCED equation? SO₂(g) + O₂(g) → SO3(g)

Predict the aldol product that would result when the following aldehyde is allowed to react under the following conditions: HCl, H₂O, heat Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges), Atoms, and Templates toolbars.

Step one of glycolysis is irreversible in muscle cells, meaning that glucose-6-phosphate is not easily converted back to glucose. Why would this beneficial to muscle cells? (optional) Glucose-6-phosphate is an allosteric inhibitor of hexokinase, the enzyme that catalyzes reaction 1 of glycolysis. Review the section in your text about enzyme inhibitors. a. How does an allosteric inhibitor work? b. Why would this enzyme be a good target for regulation by inhibition?

What is the name of this compound? A) 1-methyl-5-bromoaniline B) N-methyl-3-bromoaniline C) N-methyl-p-bromoaniline D) 1-bromo-3-N-methylamine benzene E) 1-brotno-3-N-methyl aniline

The IUPAC name for this compound is A) N-ethylpropanamide. B) N-ethylacetamide. C) pentanamide. D) N,N-diethylacetamide. E) ethylpropionamide

The net chemical equation for the first step of glycolysis is: Glucose + ATP glucose-6-phosphate + ADP Write a similar equation for the following steps of glycolysis: a. Step 7: b. Step 4: c. Step 10: d. Step 6: e. Step 3:

What is the rate law for the following mechanism in terms of the overall rate constant k? Step 1: A+B = C (fast) Step 2: B+C → D (slow) Express your answer in terms of k and the necessary concentrations (e.g., k* [A]^3* [D]).

Hydrazine reacted with oxygen according to the (unbalanced) equation N₂H4 (1) + O₂(g) → NO2 (g) + H₂O (g) pe un lf 25.00 kg of hydrazine are reacted with 150.0 kg of oxygen, which is the limiting reagent? 1905 19 How many kg of NO2 are produced from the reaction of the limiting reagent? If 36.00 kg of NO2 are obtained from the reaction of the limiting reagent, what is the % yield? Suser (20

A certain reaction with an activation energy of 165 kJ/mol was run at 535 K and again at 555 K. What is the ratio of f at the higher temperature to f at the lower temperature? Express your answer numerically using one significant figure.

A certain reaction has an activation energy of 70.0 kJ/mol and a frequency factor of A₁ = 5.00x1012 M-¹s-¹. What is the rate constant, k, of this reaction at 29.0 °C ? Express your answer with the appropriate units. Indicate the multiplication of units explicitly either with a multiplication dot (asterisk) or a dash.

How many Hg atoms are present in the sample?

What are the moles of each element in 100.0 g of vinegar? (Enter your answers to three decimal places.)

The empirical formula for vinegar is CH₂O. Determine the molecular formula of vinegar if the molar mass is known to be about 60 g/mol. What is the molar mass of your molecular formula, C₂H4O2? (Enter your answer to two decimal places.)

A canister of chlorine gas contains 2,270 mL under a pressure of 0.836 atm. Assuming unchanging temperature and amount of gas, what is the pressure when the volume is decreased to 1.00L? a. 0.368 atm b. 1.90 atm C. 2.72 atm d. 1,900 atm e. 2,720 atm

What is the mass (in amu) of 72 mercury atoms?

Copper (Cu) is element 29 on the periodic table. Calculate the mass, in grams, of 1.46 mol of Cu.

Gadolinium (Gd) is element 64 on the periodic table. Calculate the amount (mol) Gd in 2.54 g Gd.

2.60 g of iron is reacted with 2.60 g of water according to the chemical equation shown below. How many grams of the excess reagent is remaining? 3 Fe(s) + 4H₂O(l) ---> Fe3O4(s) + 4 H₂(g) A) 1.48 g of water remaining B) 6.04 g of iron remaining C) 3.59 g of iron remaining D) 8.35 g of water remaining E) 4.76 g of iron remaining

A sample of Xe weighs 20.5 grams. Will a sample of Ca that contains the same number of atoms weigh more or less than 20.5 grams? Calculate the mass of a sample of Ca that contains the same number of atoms.

(S)-2-hydroxypropanoic acid (lactic acid) is produced in the fermentation of milk to make yogurt. Some bacteria produce a mixture of stereoisomers and some produce solely the (R)-isomer. (S)-lactic acid. is shown below. Draw the (R)-isomer. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable.

The following reaction steps are shown using conventional electron pushing. (a) Draw the second product whose formation would have been rationalized with this same arrow. (b) Use the bouncing arrow formalism to illustrate the formation of only the product shown.

The activation energy of a certain reaction is 35.2 kJ/mol. At 24 °C, the rate constant is 0.0160s-¹. At what temperature in degrees Celsius would this reaction go twice as fast? Express your answer with the appropriate units.