Organic Chemistry Questions

Which compound is classified as a hydrocarbon? (A) ethanoic acid (B) chloroethane (C) ethane (D) ethanol

The functional group-COOC-is found in 1. esters 2. aldehydes 3. organic acids 4. alcohols

Which compound is an alcohol? (A) butanal (B) butanone (C) butane (D) 2,2-butandiol

What is the partial pressure in atmospheres of H₂, if a mixture has 5.0 moles of CO₂, 3.0 moles of N₂, and 1.0 mole of H₂? The container has a total volume of 5.73 L at room temperature of 25.00 °C. • Your answer should have two significant figures (round your answer to one decimal places). • Use R= 0.08206 L atm/mol K

Which of the following statements is/are false? a) The wavelength of microwave radiation is shorter than the wavelength of gamma radiation. b) A car has a longer de Broglie wavelength than an atom when traveling at the same velocity. c) A continuous spectrum contains no observable gaps, all wavelengths of a given range is observed.

Write an expression for the equilibrium constant for the reaction. CH₄(g) +2 Br₂(g) = CH₂Br₂(g) + 2HBr(g) K=

Which of the following variables would not affect the equilibrium state of the reversible reaction below? N₂ (g) + O₂(g) ⇋ 2 NO (g) Nitrogen, Oxygen, Nitrous oxide ○ Amount of Nitrous Oxide ○ Amount of Oxygen Gas ○ Pressure ○ Amount of Nitrogen Gas ○ Temperature O None of these

According to Le Chatelier's principle, when the volume of a system is reduced, the reaction will shift... (A) To the side with fewer gas molecules (B) In favour of the endothermic reaction (C) In favour of the exothermic reaction (D) To the side with more gas molecules

Determine if NaNH2 is a suitable reagent to deprotonate each of the two compounds shown below. l = yes; II = yes l = no; II = no l = no; Il = yes l = yes; Il = no Not possible to determine with the information provided

A 3.50-g sample of a newly discovered metal from Mars absorbs heat, upon which the temperature of the sample increases from 20.0°C to 28.5 °C. The specific heat capacity of the metal is 0.68 Jg-1 K-1. How much heat was absorbed in J?

A gas mixture contains 0.45 mol of neon and 0.56 mol of xenon in a 4.00 L flask at 318 K. What is the total pressure of the mixture? Select the correct answer below: (A) 6.6 atm (B) 0.80 atm (C) 3.9 atm (D) 3.7 atm

Which of the following correctly expresses the standard Gibbs free energy change of a reaction in terms of the reaction temperature (T) and equilibrium constant (K)? A) △G° = -RTInk B) △G° =eK/RT C) △G° = RTINK D) △G° = e^(-K/RT) E. None of above

1. How many unpaired electrons are in the oxygen atom? This atom is A. Paramagnetic B. Diamagnetic 2. How many unpaired electrons are in the nickel atom? This atom is A. Paramagnetic B. Diamagnetic

Which is true of the reaction? (A) The reaction proceeds by an E2 mechanism, and the reaction rate is first order in both alkyl bromide (B) The reaction proceeds by an E2 mechanism, and the reaction rate is first order in alkyl bromide con ethanol concentration. (C) The reaction proceeds by an E1 mechanism, and the reaction rate is first order in both alkyl brom (D) The reaction proceeds by an E1 mechanism, and the reaction rate is first order in alkyl bromide ethanol concentration.

Which of the following reactive intermediate species maintains sp3 hybridization? A) methyl carbanion B) dibromocarbene C) tertiary carbocation D) secondary alkyl radical E) both B and C A) methyl carbanion C) tertiary carbocation D) secondary alkyl radical E) both B and C

"Q", the reaction quotient, is used to... (A) Determine the concentration of reactants and products at equilibrium. (B) Determine if the reaction is exothermic or endothermic. (C) Determine if the reaction is at equilibrium. (D) None of the above

Which reaction results in the production of soap? (A) substitution (B) saponification (C) fermentation (D) esterification

A chemistry student weighs out 0.160 g of phosphoric acid (H3PO4), a triprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0900M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Round your answer to 3 significant digits.

A). What is the hybridization of the central atom in AsF5? Hybridization= What are the approximate bond angles in this substance? Bond angles= B). What is the hybridization of the central atom in SF5CI? Hybridization= What are the approximate bond angles in this substance? Bond angles =

Treatment with O₃, followed by dimethyl sulfide (DMS), converts a trans-disubstituted alkene into a(n) 1. primary alcohol and aldehyde 2. allylic alcohol and ketone 3. secondary alcohol and carbon dioxide 4. tertiary alcohol and carboxylic acid 5. aldehyde and aldehyde 6. ketone and ketone 7. aldehyde and carbon dioxide

Thermal pollution is caused when_____water is released into waterways. This causes the amount of______in the water including oxygen, to________.

1. Draw a plot of energy vs dihedral angle with two rotations of 60° each about carbons 2 and 3 of butane. Label the axes ( x= ϴ = 0°, 60° and 120° y = Energy) and draw Newman projections at each maxima and minima. 2. What causes the difference in energy between the conformation at 0° and the conformation at 60°? 3. What causes the difference in energy between the conformation at 0° and the conformation at 120°? 4. Take a picture of your butane in the anti conformation (Newman projection) and upload it with the conformational analysis plot.

A. What is the hybridization of the central atom in SiH₄? Hybridization = What are the approximate bond angles in this substance? Bond angles = B. What is the hybridization of the central atom in CSe₂? Hybridization = What are the approximate bond angles in this substance? Bond angles =

Two elements A and B form compounds having formula AB2, and AB4, When dissolved in 20g of benzene (CH), Ig of AB, lowers the freezing point by 2.3 K whereas 1.0 g of AB, lowers it by 1.3K The molar depression constant for benzene is 5.1 K kg mol-. Calculate atomic masses of A and B.

When CO₂(g) reacts with H₂(g) according to the following reaction, 23.3 kJ of energy are absorbed for each mole of CO₂(g) that reacts. Complete the following thermochemical equation. 2CO₂(g) + 5H₂(g) ---> C₂H₂(g) + 4H₂O(g) ∆H =

Zinc metal will react with nitric acid vigorously. (hint for acid formula ic=ate) What mass of zinc metal will react completely with 40.0 mL of 0.200M Nitric Acid? 0.26 g 0.98 g 3.1 g 1.2 g

At a certain temperature, calcium fluoride (CaF2) has a value of Ksp = 7.7 x10^-11. At this temperature, what is the molar solubility of CaF2 in the presence of 0.027 M Ca(NO3)2? Report your answer to two significant figures (i.e. 1.2E-5 M).

Decompression sickness is caused by Diving down too quickly when scuba diving Coming up too slowly when scuba diving Diving down too quickly when scuba diving Coming up too quickly when scuba diving

Name the compound with the condensed structural formula CH₃CH₂CH₂CHO? (A) 1-propanol (B) 1-butanol (C) propanal (D) butanal

Molecules of 2-methyl butane and 2,2-dimethyl propane have different molecular formulas number of covalent bonds number of carbon atoms structural formulas

4. Draw all possible Newman projections for 2,2,3,3-tetramethylbutane, looking down carbons 2 and 3, rotating every 60°. Draw the potential energy diagram and calculate the energy of each conformation using the values below (10 pts).

When we write an equation showing all of the ions from the dissociated substances, we call it the: (A) complete molecular equation (B) net ionic equation (C) complete ionic equation (D) spectator ion equation

How much heat is needed to raise the temperature by 2.00°C for a metal with a specific heat of 0.780 J/g ºC and a mass of 45 grams?

What is the strongest intermolecular force present in a pure sample of N₂? (A) dipole-dipole forces (B) no intermolecular forces in this substanceno intermolecular forces in this substance (C) hydrogen bonding (D) dispersion forces

According to Le Chatelier's principle, when the temperature of a system is reduced, the reaction will shift... (1) To the side with more gas molecules (2) To the side with fewer gas molecules (3) In favour of the exothermic reaction (4) In favour of the endothermic reaction

CuSO4(aq) + Zn(s) ---> + Cu(s) + ZnSO4(aq) The single-replacement reaction above produces 158.0 g of copper and an unknown concentration of zinc sulfate. With excess CuSO4, what mass of Zn was used? Molar mass of Cu: 63.55 g/mol ; Molar mass of Zn: 65.38 g/mol Answer: ________g of zinc (Use 4 sig figs)

What is the gram formula mass of Ca(OH)₂?

Choose the correct statement for the blank to complete the following sentence: In the radical chlorination of methane, _______________ is the rate-determining step. hv (1) Cl-Cl => 2Cl° (2) CH4 + Cl° => CH3° + HCL (3) CH3° + Cl-Cl => CH3Cl + Cl° (4) Cl° + CH3° => CH3Cl (5) CH3° + CH3° => CH3CH3 (6) Cl° + Cl° => Cl-Cl (a) step (1) (b) step (2) (c) step (3) (d) step (6)

Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 °C to 30.0 °C if the specific heat of the substance is 2.01 J/g ºC.

In saturated hydrocarbons, carbon atoms are bonded to each other by (1) alternating double and triple bonds (2) alternating single and double bonds (3)double bonds (4) triple bonds (5) single bonds

Complete and balance the following half-reaction in acidic solution. Be sure to include the proper phases for all species within the reaction. NH3(g) → NO3- (aq)

The physician prescribes 400 mg of a drug. The drug vial reads 500 mg/ml. How much of the drug should the nurse give (in mL)? Report answers with appropriate decimal places for professionals to dispense.

What is the total pressure of a methane-propane gas mixture if the partial pressure of methane is 655 torr and the partial pressure of propane is 280 torr? Enter your answer in torr to the nearest whole number, do not include units.

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4NH₃(g) +7O₂(g) → 4NO₂(8) + 6H₂O(g) The combustion of 65.0 g of ammonia consumes___________g of oxygen.

Which of the following processes causes the free radical bromination of methane to be slower than the equivalent free radical chlorination? (A) initiation (B) hydrogen abstraction (C) halogen abstraction (D) termination. (E) entropy

Write the equation for Keg for the following as a homogeneous equilibrium (only the aqueous phase) CaCO3(s) +2 HF(aq.) <-> CaF2(aq.) + H₂O(liq.) + CO₂(aq.) K eq.= The concentration of HF is squared because its coefficient is 2

Calculate the number of Liters present in 2.9x10²³ molecules of CO.

Use the reaction below to answer the question. PCI5 (g)⥨ PCl3 (g) + Cl₂(g) (△H=67kJ/mol) If the reaction is at equilibrium, and a scientist decreases the temperature of the reaction container, what will happen? The reaction will shift to the right More PCl3 will be produced More Cl₂ will be produced The amount of PCl5 will decrease. More PCl5 would be produced

A metal with a specific heat of 0.70 J/gC and a mass of 8.00 g has a temperature change of 48.0 degrees. How much heat was added?

A negative heat of reaction indicates which of the following? A. Endothermic reaction B. Exothermic reaction C. Exothermic and endothermic both D. Neither exothermic nor endothermic E. None of above