Organic Chemistry Questions

Calculate the standard molar enthalpy change of each equation by giving the step-by-step solution. 1) H2(g) + 1/2 O2(g) ==> H2O(I) ΔH= -286 kJ 2) HCl(aq) + N ==> aOH(aq) + NaCl(aq) + H2O(I) + 58 kJ 3) C6H12O6 + 6H2O ==> 6H2 + 6CO2 ΔH= -627 kJ 4) 6CO2 + 6H2O + 2803 kJ ==> C6H12O6 + 6H₂O 5) CaCO3 +178kJ ==> CO2 + CaO

Considering your properly drawn Lewis dot structure and what you know about polarity and "like dissolves like", select all of the compounds that are miscible with ethanol, CH3CH2OH. A. HF B. CH4 C. CH3OH (methanol) D. S02 E. CH20 F. C6H6 G. N2 H. Al2O3 I. NH3 J. CO2

Write the formula for (R)-3-chlorocyclohexene a. Using wedges and broken lines b. Haworth projection c. Upload picture of the model in each one of the projections

Which of the following is the best definition of a pair of atropisomers? a. A pair of enantiomers which do not interconvert. b. A pair of enantiomers which lack chiral centers. c. A pair of enantiomeric structures which lack chiral centers and interconvert by rotation around, carbon-carbon single bonds. d. A pair of enantiomers which lack chiral centers and do not interconvert because of hindered rotation around carbon-carbon single bonds.

Using the three-letter shorthand notations name all isomeric tripeptides that can be made from serine, pheylalanine, and glycine. Each amino acid should be used only once in each tripeptide.

Draw the molecule listed below. CH3CHBRCH=CHCHBRCH3

The rate constant for the reaction below was determined to be 3.241x10^-5 s^-1 at 800 K. The activation energy of the reaction is 235 kJ/mol. What would be the value of the rate constant at 9.10×10^2 K? N2O(g) --> N2(g) + O(g)

The compound ICI contains nonpolar covalent bonds. polar covalent bonds, with partial negative charges on the Cl atoms. ionic bonds. polar covalent bonds, with partial negative charges on the I atoms.

Suppose you did NOT swirl the container properly to get rid of all the CO₂ gas during the titration, and ended up with leftover CO₂ still in the container when you obtained the stable green color (indicating complete neutralization). (b) Using at least TWO complete sentences: Would doing this OVERESTIMATE or UNDERESTIMATE the MOLES of acetic acid left over after the H₂-producing ("First steps") reaction was complete? What is the chemical (and/or mathematical) explanation for why this is?

Magnesium metal can react in the presence of oxygen gas to produce magnesium oxide. A sample of 41.23 g of magnesium metal was reacted with 20.65 g of oxygen gas resulting in the production of 10.66 g of magnesium oxide. What was the percent yield of this reaction? a. 15.6% b. 22.3% c. 100% d. 20.5% e. 19.5%

A student places 5.3 g of a solid substance into a test tube and heats it up. After heating it (and then letting it cool), they weigh the substance again. To their surprise, the mass is now 3.6 g. In a few sentences, explain to the student which type of reaction this likely was, and also explain how this relates to mass conservation. Explain to the student why they experiences a decrease in mass.

A compound with a molar mass of 544.0 g/mol is made up of 26.5 grams Carbon, 2.94 grams Hydrogen, and 70.6 grams Oxygen. What is its empirical and molecular formula?

A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank then? 0.625 atm 4.44 atm 5.63 atm 40.0 atm 69.5 atm

Calculate the moles in 644.0 mL of a 0.275 M solution.

Calculate the number of oxygen atoms in 2.00 moles of Mn2O7. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer a 8.43x10^24 atoms b 1.20x10^24 atoms c 444 atoms d 14.0x10^24 atoms

You have a 1.00-mole sample of water at -40.°C and you heat it until you have gaseous water at 130°C. Calculate q for the entire process. Use the following data. Specific heat capacity of ice=2.03 J/*C-g Specific heat capacity of water =4.18 J/*C-g Specific heat capacity of steam=2.02 J/*C-g H₂O(s)→ H₂O(l) AH fusion 6.02 kJ/mol (at 0°C) H₂O(1)→ H₂O(g) AH vaporization = 40.7 kJ/mol (at 100. C)

Use the dissociation reaction to answer the question. FeSCN2+ (aq) = Fe3+ (aq) + SCN- (aq) In the reaction, FeSCN2+ ions are red, Fe3+ ions are pale yellow, and SCN- ions are colorless. A solution at equilibrium is yellow-orange. The concentration of SCN- ions is increased by a moderate amount. Which color will the solution most likely become? colorless orange red yellow

5.54 The specific rotation of (S)-carvone (at 20°C) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had a specific rotation of -55. (a) What is the specific rotation of (R)-carvone at 20°C? (b) Calculate the % ee of this mixture. (c) What percentage of the mixture is (S)-carvone?

In the laboratory a student finds that it takes 124 Joules to increase the temperature of 12.2 grams of solid sulfur from 23.4 to 38.1 degrees Celsius. The specific heat of sulfur calculated from her data is ___ J/g°C.

Draw 1-Ethyl-2-isopropylcyclohexanes both cis and trans in the most stable Chair conformation (ignore Rand S for now) label each substituent as "e for equatorial" or "a for axial". Upload the models (pictures) and the drawings

Avogadro's number is unfathomably big. To give us some perspective, let's think of if it terms of time. Consider one mole of seconds. That's 6.02x10^24 seconds. How many trillions of years is that?

a. Is condensing water vapor an exothermic process or an endothermic process? exothermic endothermic b. Is burning gasoline an exothermic process or an endothermic process? exothermic endothermic c. Is freezing ice cream an exothermic process or an endothermic process? exothermic endothermic

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain? (The accepted caloric values for foods are 4.0 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.)

1 mol Al₂(CrO4)3 = 401.96 g Al₂(CrO4)3 6. Na.N 1 mol Na₂N = 82.98 g Na₂N 7. NH,Br 1 mol NH₂Br = 97.95 g NH,Br 8. H.S04 1 mol H₂SO3(aq) = 82.09 g H₂SO3 (aq) 9. Ba(CIO), 1 mol Ba(CIO₂)₂ = 336.23 g Ba(CIO₂)₂

The reaction is pH dependent even though the H+ ion does not appear in the overall reaction. Which of the following explains this observation? Check all that apply. The exponent of [H+] in the rate law is zero. H+ serves as a catalyst in the reaction. H+ enters the reaction mechanism after the rate-determining step. H+ is an intermediate in the reaction mechanism.

Which of the following alkanes are in the staggered or eclipsed conformation? Match the alkane with the conformation. Drag and drop options on the right-hand side to reorder and match with items on the left. Reordering may cause items on the right-hand side to swap positions. Compound 1) - Staggered Compound 2) - Staggered Compound 3) - Eclipsed Compound 4) - Eclipsed

9. Why is wood considered to be an insulator and metal is considered to be a conductor of energy? * A. Metals have freely moving electrons, and wood is bound together in molecules held in place. B. Metals have electrons bound in molecules and wood has open spaces where electrons can move freely. C. Metals have networks with a framework of ions, and wood forms interlocked layers of electrons. D. Metals do not conduct heat, and wood does.

A reaction produces 7.64mol of oxygen gas. If the pressure in the room is 1.25atm and the temperature if 208.13°C, what volume of oxygen gas was produced in liters? Reaction: 6CO2(g) + 6H2O(g)--> C6H12O6(1)+902(g)

How many moles of sulfur dichloride are present in 7.74 x 1022 molecules of this compound?

Write the structural formula for each of the names given. For each functional group: i. Draw the 3D structure (molecular geometry) write all bonds and lone pairs. ii. Indicate the dipole for polar bonds and do vector addition to determine the polarity of the FG (if any). iii. indicate the strongest IMF at the FG. a. 3-methylpentanal b. ethoxyethane c. 2-methylpentanamide d. 4-methypentan-1-ol e. 3-methylpentanoic acid f. Methyl-2-methylpentanoate

What are the partial pressures in a mixture contaiin 0.254 mol of O2 and 0.569 mol of N2 if the total pressure is 157.0 torr? PO2 = 48.5 torr; PN2 = 109 torr PO2 = 70.1 torr; PN2 = 86.9 torr PO2 = 39.9 torr; PN2 = 89.3 torr PO2 = 76.9 torr; PN2 = 80.1 torr

The amount of energy needed to heat 2.00 g of carbon from 50.0°C to 80.0°C is 42.60 J. The specific heat capacity of this sample of carbon is 2556 J/g °C 0.710 J/g °C 1278 J/g °C 1.41 J/g °C 0.266 J/g °C

A reaction occurs in a calorimeter, resulting in the starting and final temperatures shown below. What can you say about the reaction and the enthalpy change (AH) during the reaction? Starting temperature: 21.0 °C The reaction is endothermic and AH is positive. The reaction is endothermic and AH is negative. The reaction is exothermic and AH is negative. The reaction is exothermic and AH is positive.

Which statement describes condensation polymers? They are made of monomers that have two functional groups They may form between an organic acid and an amine When they are produced, a small molecule (such as water, ammonia, or ethanol) is also produced They may contain an ester bond or an amide bond

a. Write the formulas condensed (CH3CH2 etc.) and line for the branches that have common names. b. Write the common and IUPAC names for each one e.g isopropyl = (1-methylethyl).

Enter the correct name for Ba(C₂H₂O₂)₂

Number of correct statement among the following is: (a) When the pH of rain water drops to 6.5, it is called acid rain. (b) The acidity of soil can be reduced by adding powdered limestone. (c) Peroxyacetal nitrate act as powerful eye irritant. (d) Bacteria like escherichia coli causes gastrointestinal disease. (e) Clean water should have BOD value of 17 ppm or more. (f) The prescribed upper limit concentration of lead in drinking water is about 50 ppm

A chemistry teacher adds red food coloring to water and students observed the dye spreading out to fill the container. Is the teacher demonstrating a physical or chemical change? Chemical change because a new substance was formed. Physical change because red dye mixed with the water. Physical change because a new substance was formed. Chemical change because red dye reacted with the water.

Consider the given equilibrium H₂O(s) ---H₂O(1) Backward shifting of equilibrium is favoured by High temperature, Low pressure High temperature, High pressure Low temperature, Low pressure Low temperature, High pressure

Diethyl ether is made from ethanol. The reaction is given below. 2C2H5OH → (C2H5 )2O + H₂O Ethanol Diethyl ether In an experiment, 517 g of ethanol gave 391 g of diethyl ether. What was the percent yield in this experiment?

Vacuum filter using the Buchner funnel, rinse the mortar with 5 ml of methanol and add the rinsing to the Buchner funnel. Wash the residue in the funnel with 25 ml of pet ether (a mixture of pentanes)

Draw both chair conformations for each of the following compounds. In each case, identify the more stable chair conformation: (a) Methylcyclohexane (b) trans-1,2-Diisopropylcyclohexane (c) cis-1,3-Diisopropylcyclohexane (d) trans-1,4-Diisopropylcyclohexane

Hydrogenation of 3-nonyne using Lindlar's catalyst can be described as (a) a regioselective reaction (b) a regioselective and a stereoselective reaction (c) an electrophilic substitution reaction (d) forming a product of formula C9H18 (e) an oxidation reaction

Choose the incorrect statement. Aniline is produced by Hoffmann degradation of benzamide. Butanamide gives propanamine by Hoffmann bromamide reaction. Gabriel synthesis is used for preparation of aniline Amide on reduction with LiAIH4 yield amines.

How many stereoisomers are possible for CHCl3 provided that the central carbon has a tetrahedral geometry Answer is 1, if you can draw only one stereochemical formula.

What volume of a 0.354 M hydrochloric acid solution is required to neutralize 17.9 mL of a 0.133 M sodium hydroxide solution?

Draw the structural formula for triisopropylamine.

Determine whether 1-chloro-2-methylbutane contains a chiral center. How many different substituents do you count at atom #(2)?

a. Draw the orbital sketch for methanal (formaldehyde) HCOH. Indicate the hybridization of the atomic orbitals. Label each orbital. Label the molecular orbitals as sigma and or pi Label the angles b. Build the model c. Upload the picture of the model with the sketch

Draw orbital sketches and build the models for: a) Ethene/ethylene (C₂H4). Each carbon in ethene has 3 regions (gray pieces, sp2) this molecule is trigonal planar, the 3D structure is done with solid lines, all in the same plane) b) Ethyne/acethylene (C₂H₂). There is only one triple bond (gray) with regions above and below the internudtear axis. The piece already represents the two carbons of the triple bond, just add the two hydrogens (white spheres). The piece without H represents 4 carbons. The angles around each carbon are 180⁰.