Organic Chemistry Questions
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Organic Chemistry
HydrocarbonsA compound with molecular formula C6H₁0 gives three signals in its 1H NMR spectrum with the following integration values measured in mm: 13, 33, 73. a) How many protons are responsible for each signal? b) Deduce the structure of this compound.
Organic Chemistry
General organic chemistryA sample of hydrogen gas occupies 250 mL at 90 mmHg. For a gas sample at 25°C, determine the number of moles of hydrogen present in the
sample.
10,962 moles
826.4 moles
0.0000912 moles
0.920 moles
0.00121 moles
Organic Chemistry
General organic chemistryRank the following gases by the number of moles they would contain at STP, greatest to least.
30 L of helium gas, 0.5 moles of oxygen gas, 67.2 L of nitrogen gas.
Helium
Nitrogen
Oxygen
Organic Chemistry
General organic chemistryYou have 33.6 L of neon gas at STP. How many moles is this?
1.5 moles
22.4 moles
752.64 moles
11.2 moles
J
Organic Chemistry
General organic chemistryIn the context of small molecules with similar molar masses, arrange the intermolecular forces by strength.
London dispersion forces hydrogen bonding
Strongest
Weakest
Answer Bank
dipole-dipole interactions
Organic Chemistry
HydrocarbonsCalculate the mass of butane needed to produce 96.0 g of carbon dioxide.
Express your answer to three significant figures and include the appropriate units.
Organic Chemistry
HydrocarbonsA sample of propane, C3H8, contains 17.9 moles of carbon atoms. How many total moles of atoms does the sample contain?
Express the total number of moles of carbon and hydrogen numerically.
Organic Chemistry
General organic chemistryCalculate the pressure; in atm, of 0.0158 mole of methane (CH4) in a 0.275 L flask at 27 °C.
0.13 atm
1.4 atm
1.6 atm
0.71 atm
Organic Chemistry
General organic chemistryDetermine the new temperature in °C for a sample of neon with the initial volume of 2.5 L at 15 °C, when the volume is changed to 3550 mL.
Pressure is held constant.
21.3 °C
294 °C
-252 °C
136 °C
409 °C
Organic Chemistry
General organic chemistryCorrectly rearrange Charles' Law to solve for the unknown in the following problem: Determine the new temperature in °C for a sample of neon with the initial volume of 2.5 L at 15 °C, when the volume is changed to 3550 mL. Pressure is held constant.
Organic Chemistry
General organic chemistryA sample of nitrogen (N₂) has a volume of 50.0 L at a pressure of 760 mmHg. What is the volume of gas at a pressure of 1500 mmHg if there is no
change in temperature?
0.010 L
25 L
0.040 L
96.7 L
Organic Chemistry
General organic chemistryYou are using your hot air balloon to travel. At constant pressure, you decrease the temperature of the gas by turning down the flame. What do you expect to happen to the volume of the 400 L balloon as the temperature decreases?
about the same as 400 L; temperature alone does not affect volume
more than 400 L; as temperature decreases the volume will increase
less than 400 L; as temperature decreases, volume also decreases
more information is needed to make a determination
Organic Chemistry
Practical DetectionA sample of helium gas has a volume of 6.5 L at a pressure of 1.11 atm and a temperature of 25 °C. What is the pressure of the gas in atm when the volume and temperature of the gas sample are changed to 1850 mL and 325 K, respectively?
0.235 atm
0.300 atm
4.25 atm
173.5 atm
Organic Chemistry
IsomerismThe best method to prepare acetophenone is:
O3 oxidation of styrene
KMnO4 oxidation of styrene
KMnO4 oxidation of phenylethanol
NBS oxidation of phenylethanol
PCC oxidation of 1-phenyl ethanol
Organic Chemistry
IsomerismDraw a Lewis structure for PO,³ in which the central P atom obeys the octet rule, and answer the following questions based on your drawing.
The number of unshared pairs (lone pairs) on the central P atom is:
The central P atom forms _ single bonds.
The central P atom forms _double bonds.
Organic Chemistry
General organic chemistrySuppose there is a gaseous mixture of nitrogen and oxygen. If the total pressure of the mixture is 440 mmHg, and the partial pressure of nitrogen is 250 mmHg, calculate the partial pressure of oxygen in the mixture using Dalton's law.
Organic Chemistry
IsomerismAluminum oxide, Al 203, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.
2.146 mol
0.4207 mol
1.105 mol
0.4660 mol
2.377 mol
Save Answer
Organic Chemistry
Chemistry in Daily LifeWhich of the following is NOT a true statement?
Strong bases produce large quantities of hydroxide ions.
Weak acids ionize partially in water.
Strong bases react with strong acids to make salt and water.
Strong acids produce large quantities of hydronium ions.
Weak bases are good electrolytes.
Organic Chemistry
IsomerismA chemise prepares a solution of copper(II) sulfate (CuSO4) by measuring out 91.1 μmol of copper (II) sulfate into a 450. mL. volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's copper(II) sulfate solution. Round your answer to 3 significant digits.
Organic Chemistry
Etherslonic compounds
may have any net charge
form mostly between two metalloids
have zero net charge
will not dissolve in water
Organic Chemistry
Chemistry in Daily LifeA flexible container at an initial volume of 7.14 L contains 3.51 mol of gas. More gas is then added to the container until it reaches a final volume of 16.7 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of
moles of gas added to the container.
Organic Chemistry
Practical DetectionThe atomic mass of hydrogen is 1.01 g/mol. What percentage of H atoms have an atomic mass of
1.01 amu?
66 %
100 %
33 %
None
More information is needed to determine this.
(you only have one attempt on this question)
Organic Chemistry
General organic chemistryWhen nitric acid (HNO3) reacts with sodium bicarbonate (NaHCO3), the products are
a. hydrogen (H₁₂) and sodium carbonate (Na₂CO3).
b. carbon dioxide (CO₂), water (H₂O), and sodium nitrate (NaNO3).
C.carbon dioxide (CO₂), water (H₂O), and sodium carbonate (Na₂CO3).
d. water (H₂O) and sodium nitrate (NaNO3).
e.cwater (H₂O) and sodium carbonate (Na₂CO3).
Organic Chemistry
Halogen DerivativesWhich of the following bases is named incorrectly?
Fe(OH)3 - Iron (III) Hydroxide
KOH- Potassium Hydroxide
Ca(OH)₂ - Calcium Hydroxide
NH3 - Ammonia
Cr(OH)3 - Chromium Hydroxide
Organic Chemistry
Halogen DerivativesWhat volume of 5.16 M NaOH is needed to completely titrate 689.2 mL of 2.59 M phosphoric acid
according to the equation:
H3PO4(aq) + 3 NaOH(aq) → Na3PO4(aq) + 3 H₂O(l)
mL
Organic Chemistry
IsomerismA chemist prepares a solution of barium chlorate (Ba(ClO3)₂) by measuring out 28. µmol of barium chlorate into a 150. mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mol/L of the chemist's barium chlorate solution. Round your answer to 2 significant digits.
Organic Chemistry
General organic chemistryWhich of the statements are evidence that gases do not always behave ideally?
When two gases are mixed, they follow Dalton's law of partial pressures.
It is impossible to compress a gas enough so that it takes up no volume.
CO₂ gas becomes dry ice (solid CO₂) at 1 atm and -78.5 °C.
At 4 K and 1 atm, helium is a liquid.
Organic Chemistry
BiomoleculesIn the peptide, Ala-Leu-Cys-Met, there are__ peptide bonds and the amino terminal is the amino acid
A. 4; Alanine
B. 4; Methionine
C. 3; Methinine
D.3; Alanine
E. 3; there is no amino end
Organic Chemistry
General organic chemistryGases produced by a chemical reaction can easily be collected over water. To determine the pressure of the dry gas, the
vapor pressure of the water at that temperature must be subtracted from the total pressure.
1) Consider the following reaction:
Mg(s) + 2HCl(aq) -> MgCl₂(aq) + H₂(g)
The total pressure of gas collected over water is 650.0 mmHg and the temperature is 22.0°C What is the pressure of hydrogen gas formed in mmHg?
Organic Chemistry
General organic chemistryInsulin is.............. that regulates.............. level in the body
A. steroid hormone, protein transport
B. proteohormone, blood glucose
C. lipoprotein, lipid transport
D. enzyme, competitive inhibition
E.storage protein, iron( Fe2+)
Organic Chemistry
Practical DetectionIn order to neutralize 25.0mL of sulfuric acid (H₂SO4), 33.3mL of 1.0M sodium hydroxide (NaOH) is needed. Calculate the molarity of the acid.
a. 0.38M
b. 0.66M
c. 0.76M
d. 1.32M
e. 1.50M
Organic Chemistry
General organic chemistryA fatty acid salt can act as a soap to remove grease because
A. the nonpolar tails of the salt cause the salt to float on the surface of the water
B. the nonpolar tails of the salt dissolve in the grease and the polar salt ends dissolve in water
C. the polar salt ends dissolve in the grease and the nonpolar tails cause the resulting molecules to on water.
D. the salt molecules combine with grease and either Ca2+ or Mg2+ to form a precipitate.
E. the grease molecules form a thin layer around each salt molecule, making them soluble in water.
Organic Chemistry
General organic chemistryAnswer each question below and upload an image of your handwritten
work. Show ALL your work for full credit. Credit will not be granted if
only the answer is shown with no work.
1) A 15.0 mL solution of H₂CO3 at an unknown concentration is
titrated with 0.215 M KOH solution. If it requires 26.19 mL of KOH
solution to reach the equivalence point, what is the concentration of the
H₂CO3 solution?
H₂CO3(aq) + 2 KOH(aq) → 2 H₂O(l) + K₂CO3(aq)
2) How many grams of sodium phosphate (Na3PO4) are in 125.0
mL of a 0.432 M solution of sodium phosphate? The molar mass of
sodium phosphate is 163.94 g/mol.
Organic Chemistry
General organic chemistryComplete the table below comparing the polarities of two bonds. Enter more or less in the blank to complete the statement correctly.
B-F is polar than C-F
P-O is polar than P-S
B-F is polar than B-N
Organic Chemistry
General organic chemistryCompare the electronegativities of each pair of atoms. Enter the symbol for the element of each pair that has the greater electronegativity. (If both atoms would be expected to have the same electronegativity, enter the word same.)
Symbol for element with greater electronegativity
Pair
Mg and O
Al and C
Li and O
Organic Chemistry
Chemistry in Daily LifeThe reaction
2 NO(g) + 2 H₂(g) ---> N₂ (g) + 2 H₂(g)
follows second-order kinetics. At
200°C, [NO] drops from 0.200 M to
0.0250 M in 100.0 s. The rate constant
for the reaction is
-0.350
0.350
3500
0.0208
-0.0208
Organic Chemistry
Practical DetectionThe reaction between Na2CO3 and CaCl2 actually produced 25.6 g of CaCO3. If the theoretical yield is 30.15 g, What is the percent yield for this reaction?
Na2CO3 + CaCl2 ---> CaCO3 + 2NaCl
100.%
58.0 %
84.9%
73.196
37.9 %
Organic Chemistry
General organic chemistry0.003 grams of alcohol in a 15 ml sample of blood
0.006 grams of alcohol in a 5 ml sample of blood
0.01 grams of alcohol in a 12 ml sample of blood
0.006 grams of alcohol in a 20 ml sample of blood
Not significantly impaired (<
0.03% m/v)
Impaired (≥ 0.08% m/v)
= 0.006 grams of alcohol in a 5 ml sample of
blood
2021 Chamberlain University LLC. All rights reserved.
= 0.003 grams of alcohol in a 15 ml sample of
blood
= 0.01 grams of alcohol in a 12 ml sample of
blood
= 0.006 grams of alcohol in a 20 ml sample of
blood
Organic Chemistry
IsomerismComplete the Lewis structure for this species:
CO2
Enter the total number of valence electrons in the box.
Valence electrons:
Organic Chemistry
Practical DetectionYou have a gas at 35°C that is confined to a 7.5 L cylinder with pressure of 952 torr.
a. What volume will the gas occupy if the pressure is decreased to 805 torr?
8.9 L
6.3 L
It will remain unchanged.
5.5 L
Organic Chemistry
General organic chemistryA. A main group element with the valence electron configuration 2s22p5 is in periodic group
It forms a monatomic ion with a charge of
B. A main group element with the valence electron configuration 2s¹ is in periodic group
It forms a monatomic ion with a charge of
Organic Chemistry
General organic chemistryIf I have 82 ml of a solution with a molarity of 5.3 M NaBr, how many ml of a 1.1 M NaBr solution can I prepare?
0.07 ml
17.0 ml
478.1 ml
395.1 ml
Organic Chemistry
General organic chemistryPredict the products of the reactions below and make sure each is balanced:
each, 0.5 points for balance, 0.5 points for each product)
HBr + NaOH →
Organic Chemistry
General organic chemistryUse the generic elementary steps
shown to below to answer the
following questions.
A + B ---> C + D Elementary Step 1 (slow)
A + D ---> C+E Elementary Step 2 (fast)
a. Based on the provided elementary
steps, but is the net reaction?
Organic Chemistry
Practical DetectionA mixture containing 0.550 mol Cl₂,
0.443 mol Br2, and 0.520 mol I2 are
confined to a 10.00 L vessel at 50°C.
a. What is the partial pressure (in atm)
of Br₂ in the mixture?
b. What is the total pressure (in atm) of
the mixture?
4.01 atm
0.621 atm
1.51 atm
40.1 atm
Organic Chemistry
Practical DetectionIn lab you need to measure out 0.84 mol of C3H6O3 for an experiment. How many grams should you weigh out?
Give your answer to 2 decimal spaces.
Organic Chemistry
IsomerismWhat is the % mass/volume concentration of a solution consisting of 36 grams of K₂SO4 with a total solution volume of 0.6 L?
6%
1.6%
60%
0.06%
21.6%
Organic Chemistry
General organic chemistryThe Lewis structure for CIF₂+ is shown. What is the electron-pair geometry and the molecular geometry around the central atom?
Electron Pair Geometry:
Molecular Geometry:
Organic Chemistry
General organic chemistryWhich one of the following molecules is nonpolar?
Multiple Choice
NH3
OF2
CH₂Cl
Organic Chemistry
General organic chemistryWhat would be the molarity of a solution made by dissolving 4.1 grams of NaCl (molecular mass: 58.44 g/mole) in water to a total volume of 0.4
ters
0.4 M
0.18 M
141.6 M
7.3 M