General organic chemistry Questions and Answers

An organism uses the following reaction to generate free energy: CH4 + SO4 2- + 2H+ -> H2S + CO2 + 2H2O which of the following would increase the amount of free energy available to this organism? There is more than one correct answer, select all that apply to receive credit. The H₂S concentration were to go down. The CH4 concentration were to increase. The SO42 were to decrease The pH were to decrease The CH4 concentration were to decrease The CO₂ were to increase

When para-bromotoluene is treated with sodium amide two products are obtained. For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen explicitly in your products. Do not use abbreviations such as Me or Ph.

Which of the test metals in experiment 5 exhibited the greatest reactivity towards H₂O? Ca Al Mg

(2) Find the AH for the reaction below, given the following reactions and subsequent ΔH values: 2CO2(g) + H2O(g) → C2H2(g) + 5/2O2(g) C2H2(g) + 2H2(g) → C2H6(g) ΔH =-94.5 kJ H2O(g) --> H2(g) + 1/2O2 (g) ΔH =71.2 kJ C2H6(g) + 7/2O2(g) → 2CO2(g) + 3H2O(g) ΔH =-283 kJ answer= 235 kJ

When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? Pb(NO3)2 + K2CO3 --> PbCO3 + KNO3 5 4 3 2 1

9. Build a model of CH₂BrCI. Next, build a model of the mirror image of your first molecule. How are these models related? 10. Build a model of CHBrCIF. Next, build of model of the mirror image of your first molecule. How are these molecules related?

One of the radioactive isotopes used in medical treatment or analysis is palladium-103. The half-life of palladium-103 is 17 days. How many days is/are required for the activity of a sample of palladium-103 to fall to 12.5 percent of its original value?

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.

Draw the molecule listed below. CH3CHBRCH=CHCHBRCH3

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?

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?

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.

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).

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.

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?

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.

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

Which of the following statements is not true regarding SN2 reactions? The alkyl halide and nucleophile are both present in the transition state of an SN2 reaction. If the alkyl halide is chiral, the stereochemistry will be scrambled during the SN2 reaction. SN2 reactions work best with aprotic solvents. SN2 reactions are fastest with primary alkyl halides.

Does a reaction occur when aqueous solutions of magnesium nitrate and zinc sulfate are combined? yes no If a reaction does occur, write the net ionic equation.

Which of the following approaches would represent a high-yielding synthesis of 4-chloroheptane (without the formation of byproducts)? (a) reaction of HCI with cis-3-heptene (b) reaction of HCI with 3-heptyne (c) reaction of HCI with trans-3-heptene (d) reaction of 3-heptanol with SOCI₂ (e) none of (a), (b), (c) or (d)

StatementI: In bleaching powder oxidation state of Ca is +2. Statement II: In bleaching power, chlorine is present in both +1 and -1 oxidation states. Which of the following statement(s) is/are correct? Both statements are correct Both statements are incorrect Statement I is correct but statement II is incorrect Statement I is incorrect but statement II is correct

Consider the reaction between benzoic acid and aqueous sodium hydroxide. Which H is lost by the acid? the CO₂H H atom one of the five ring H atoms

Draw any diastereomer of (2R,3R)-2,3-dichloropentane. Be careful to indicate proper stereochemistry. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. Show the appropriate stereochemistry by choosing the dashed or wedged buttons and then clicking a bond on the canvas.

Sketch an energy diagram that shows a conformational analysis of 2,2-dimethylpropane. Does the shape of this energy diagram more closely resemble the shape of the energy diagram for ethane or for butane?

The animation starts with a roughly spherical collection of surfactant molecules, called a micelle, at the top. Which groups point into the center of the micelle? the nonpolar organic groups the ionic head groups

Which of the following objects are chiral? Check all that apply. a screw a remote control device a needle a mug with BOB written to one side of the handle a mug with MOM written to one side of the handle a mug with MOM written opposite the handle a chair a mug with BOB written opposite the handle

A 535.0-mL aliquot of 0.860 M aqueous potassium hydroxide is mixed with 535.0 mL of 0.860 M aqueous magnesium nitrate. a Write a balanced chemical equation for any reaction that occurs. (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)

The compound chromium(III) nitrate is a strong electrolyte. Write the reaction when solid chromium(III) nitrate is put into water. I

The compound iron (III) acetate is a strong electrolyte. Write the reaction when solid iron(III) acetate is put into water.

The compound sodium iodide is a strong electrolyte. Write the reaction when solid sodium iodide is put into water. Include states of matter in your answer.

BeCl₂ in vapour state above 1200 K exists as A and below 1200 K exists as B. Which of the following is incorrect about structures A and B. In structure A, the hybridization of Be is sp In structure B, the hybridization of Be is sp² In structure B, the hybridization of Be is sp³ The structure of A is linear

When natural gas (methane) burns, it reacts with oxygen in the air to form two new compounds, carbon dioxide and water. If 100 grams of methane and 100 grams of air are combined in a sealed container, and the mixture is allowed to react, what mass will be present in the container after the reaction takes place? The mass that will be present in the container is

Add the unshared (lone) electron pairs to the structure in the drawing window below. • Include all valence lone pairs in your answer. • Should you want to restart the exercise, the drop-down menu labeled == starting points == car used to redraw the starting molecule on the sketcher.

The compound nickel (II) sulfate is a strong electrolyte. Write the reaction when solid nickel (II) sulfate is put into water.

In the laboratory you dissolve 14.0 g of cobalt(II) bromide in a volumetric flask and add water to a total volume of 500 mL. What is the molarity of the solution? What is the concentration of the cobalt(II) cation? What is the concentration of the bromide anion?

Which is the correct condensed formula for difluoropropane? CH₂CHF2 CH₂CH₂CHF2 CH3CH₂F2 CH₂F2 CH3CH₂F

Match the function with the most likely compound: Refrigerant Scents and flavorings Steroidal hormone Antiseptic for surgery Component of butter and cell membranes Fuel

What is the ionization energy of the element whose electron configuration is [Ne]3s23p¹? Include the correct units and then Describe the general trend in ionization energy as the atomic number increases down a group and The lowest ionization energies tend to belong to which group?

What is the name for this molecule: CH3CH₂CH₂CH₂CH₂CH₂NH₂ propylamine heptyl amine pentylamine hexyl amine

The elementary reaction 2 H₂O(g) 2 H₂(g) + O₂(g) proceeds at a certain temperature until the partial pressures of H₂O, H₂, and O₂ reach 0.075 bar, 0.0040 bar, and 0.0045 bar, respectively. What is the value of the equilibrium constant at this temperature? K =