Organic Chemistry Questions
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Organic Chemistry
Practical DetectionAccording to the definitions
given, which is the correct
use of the word novel as an
adjective?
A. Wyatt came up with the novel idea of
having a talk show just for students.
B. This book about Abraham Lincoln is a
very interesting novel.
C. Something that everyone already
knows or is doing is called novel.
Organic Chemistry
Chemistry in Daily LifeThrough what process is heat transferred between the warm air in front of a
fireplace and the cooler air on the other side of the room?
A. Radiation
B. Convection
C. Conduction
D. Absorption
Organic Chemistry
General organic chemistryIndicate whether heat is absorbed or released in each process.
a. melting 500 g of ice: (select)
b. freezing 11 g of water: (select)
c. condensing 70 g of steam: ((select)
d. vaporizing 50 g of water: (select)
Organic Chemistry
Chemistry in Daily LifeBe sure to answer all parts.
Carry out the following conversion. Report answers to appropriate number of significant figures.
a. 354 kcal to kJ
b. 11.7 kcal to J
kJ
J
Organic Chemistry
General organic chemistryWhich of the following sources is considered to be most reliable for scientific
information?
A. Criticism of a journal article
B. A science encyclopedia
C. A conference paper that reports research
D. Laws regulating science
Organic Chemistry
General organic chemistryBe sure to answer all parts.
Combustion of 1 g of liquid hydrogen releases 33.6 kcal of energy. How many kilojoules of energy are
released? How many joules does this correspond to? Report answers to appropriate number of
significant figures.
kJ
J
Organic Chemistry
General organic chemistryA lead strip is placed in a copper(II) sulfate
solution.
a) List all the entities present in the mixture.
b) Identify all OA's and RA's.
c) Does a redox reaction occur and, if it
does what is the reaction equation?
Organic Chemistry
Chemistry in Daily LifeWhat is the change in enthalpy of the first reaction below, given the enthalpies
of the other two reactions?
2NO₂(g) →2NO(g) + O₂(g)
N₂(g)+0₂(g) → NO(g)
N₂(g) +O₂(g) → NO₂(g)
ΔH°-90 kJ/mol
ΔH-34 kJ/mol
A. -112 kJ
B. 112 kJ
C. 248 kJ
D. -56 kJ
Organic Chemistry
General organic chemistryConsider the following reaction:
4 PH3(g) + 8 0₂ (g) ---> P4010 (s) + 6 H₂O (g)
a. What is the theoretical yield of tetraphosphourous decoxide, P4010, if 28.5 g of phosphine,
b. What is the percentage yield of P4010, if the actual yield is 49.0 g ?
PH3, reacts with oxygen?
Organic Chemistry
Chemistry in Daily LifeWhich statement explains why a strip of sulfur is a better electrical insulator
than a strip of silicon?
A. Sulfur atoms have more protons than silicon atoms.
B. Sulfur atoms allow fewer electrons to move between atoms than
silicon atoms do.
C. Sulfur atoms allow more electrons to move between atoms than
silicon atoms do.
D. Sulfur atoms have fewer protons than silicon atoms.
Organic Chemistry
Practical DetectionQuestions (Answer in complete, full sentences. Limit yourself to the available space.)
1. Using your knowledge of this reaction, sketch an energy profile diagram for the reaction. In
your diagram, clearly label the axes, structures of reactants, structures of products,
activation energy (E₂), transition state structure, and AH.
Organic Chemistry
General organic chemistryBased on the data table, one scientist concludes that the mass of AgCl
formed depends only on the amount of HCI added, and another scientist
concludes that the mass of AgCl formed depends on the amount of the
limiting reactant. How might this conflict be resolved?
A. Explain the reasoning of each scientist to the other scientist.
B. Compare the solubilities of the reactants and the precipitate.
C. Read other lab reports that describe what takes place during this
reaction.
D. Perform further investigations using different amounts of
reactants.
-
Organic Chemistry
General organic chemistryConsider the combustion of benzene; 2C6H6(l) + 1502(g) à 12CO₂(g) + 6H₂O(l)
if 20.0 g of benzene and 20.0 g of O₂ reacts together according to the above reaction:
• identify the limiting reagent.
• how many grams of the excess reagent will remain unused?
Organic Chemistry
Practical DetectionFor scuba dives below 150 ft, helium is often used to replace nitrogen in the scuba tank. If 14.7 g of He(g) and 28.0 g of O₂(g) are added to a previously evacuated
5.35 L tank at 20.°C, calculate the partial pressure of each gas present as well as the total pressure in the tank.
Partial pressure of He
Partial pressure of 02
Total pressure =
atm
atm
atm
Organic Chemistry
Practical DetectionWhy does Hess's law allow you to determine the enthalpy change of a
reaction?
A. It states how the equilibrium constant is related to the enthalpy
change.
B. It states that the change in enthalpy depends on the reaction
pathway between the products and the reactants.
C. It states that the change in enthalpy is independent of the pathway
the reaction takes to get to the products.
D. It states that the enthalpy of any reaction can be determined using
a bomb calorimeter.
Organic Chemistry
General organic chemistryWhich statement best describes what happens as thermal energy from the
sun warms the pavement?
A. The thermal energy that is not absorbed by the pavement is
destroyed.
B. The thermal energy absorbed by the pavement is destroyed.
C. Some thermal energy is absorbed by the pavement, and some is
destroyed.
D. The thermal energy of the sun is transferred to the pavement.
Organic Chemistry
General organic chemistryEnter your answer in the provided box.
Carry out the following conversion. Report answers to appropriate number of significant figures.
32.9 kcal to cal
cal
Organic Chemistry
General organic chemistryWhat is the best definition of the enthalpy of formation, AH?
A. The energy released when products form in a reaction
B. The energy absorbed when products form in a reaction
C.' The energy required for an atom to form from its subatomic
particles
D. The energy required for a molecule to form from its elements
Organic Chemistry
General organic chemistryThe temperature of 500 mL of water is 16°C. What happens to the water
when thermal energy is transferred to it?
A. The volume of the water increases because thermal energy
increases as volume increases.
B. The temperature of the water increases because the average
kinetic energy of the water molecules increases.
C. The volume of the water decreases because thermal energy
decreases as volume decreases.
D. The temperature of the water decreases because the average
kinetic energy of the water molecules decreases.
Organic Chemistry
General organic chemistryIs pentane (Molecular formula: C5H12) saturated, mono-
unsaturated, or poly-unsaturated.
Hint: Draw the Lewis structure
Saturated
Mono-unsaturated
Depending on how it is drawn, it could be any of the
choices.
poly-unsaturated
Organic Chemistry
Practical DetectionA box has volume of 4.75 x 1018 μm³ (cubic micrometers). What is the volume of the box in cubic feet (ft³)?
2.54 cm = 1.00 inch; 12.00 inches = 1.00 foot
1.68 x 1011 ft³ 1.55 x 1013 ft³
2.87 × 1017 ft³ O
1.87 × 106 ft³
168 ft³
Organic Chemistry
General organic chemistryAcid 1 has a pKa value of +6.
Acid B has a pKa value of -2.
Which statement below is accurate?
Acid B is 100,000,000 times weaker than acid A.
Acid B is 80 times stronger than acid A.
Acid B is 100,000,000 times stronger than acid A.
Acid B is 80 times weaker than acid A.
Acid B is 8 times stronger than acid A.
Acid B is 8 times weaker than acid A.
Organic Chemistry
General organic chemistryThe primary structure of a protein involves which of the following?
a. Van der Waals forces
b. hydrogen bonds
c. hydrophilic forces
d. peptide bonds
e.disulfide bonds
Organic Chemistry
General organic chemistryA 1.28 mol sample of Xe gas is confined in a 31.1 liter container at 23.3 °C.
If the amount of gas is decreased to 0.640 mol, holding the volume and temperature constant, the pressure will decrease because:
Choose all that apply.
With lower average speeds, on average the molecules hit the walls of the container with less force.
With fewer molecules in the container, the molecules have lower average speeds.
As the number of molecule-wall collisions increases, the force per collision decreases.
With fewer molecules per unit volume, the molecules hit the walls of the container less often.
None of the Above
Organic Chemistry
General organic chemistryA new drug has been released to the public and is popular among
consumers. It is effective in relieving high blood pressure. However, it has
altered some patients' personalities. Which stage of the engineering process
may address this negative side effect?
A. Screening
B. Looking for improvements
C. Testing
D. Evaluating test results
Organic Chemistry
General organic chemistryA 6.9 L balloon is filled with water at 3.16 atm. If the balloon is squeezed into a 3.18 L beaker and does NOT burst,
what is the pressure of water in the balloon?
a. 6.86
b. 1.46
c. 69.3
d. 0.0789
Organic Chemistry
General organic chemistryHow much heat must be transferred to 55 g of ice to change the ice's
temperature from -13°C to -5.0°C? (The specific heat capacity of ice is 2.11
J/g °C.)
A. 930 J
B. 15 J
C. 580 J
D. 3.3 J
Organic Chemistry
General organic chemistryEthanoic acid (vinegar) when diluted to low concentrations by water can be prepared from ethene by
a. reduction with H2, followed by reaction with a strong oxidizer
b. addition of HCl, followed by reaction with H₂O
c. addition of H₂Ofollowed by reaction with a strong oxidizer
d. addition of Br2, followed by reduction with H₂
Organic Chemistry
General organic chemistryA sample of carbon dioxide gas at 292 K and 0.838 atm occupies a volume of 1.70 L. If the gas is compressed into a smaller volume,
while at the same time it is cooled to a lower temperature, the final gas pressure
will be lower than 0.838 atm.
will be higher than 0.838 atm.
could be higher or lower than 0.838 atm depending on the final volume and temperature.
Organic Chemistry
General organic chemistryWhen CH4 is reacted with excess Cl₂(g) in the presence of light, the reaction mixture contains which of the
following?
a. CH3Cl
b. CH₂Cl₂
c. CH3C1, CH₂Cl2, CHCl3
d. CHCl3
Organic Chemistry
General organic chemistryWhich of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?
1.33 moles CH4
8x1023 molecules of H₂
53.09 grams of Ar
they would all have the same volume
Organic Chemistry
Chemistry in Daily LifeDuring a test trial, the control and test group are both given a pill. To account
for the effect patients may think the drug being tested is having just because
they believe they're being treated, the control group is given a "sugar pill,"
which is called what?
A. screening tool
B. placebo
C. drug
D. medicine
Organic Chemistry
General organic chemistryThe engineering process defines the steps engineers take to create
technology. Which of these describes these steps in the correct order?
A. Identifying a problem, making a solution, testing the solution,
mass production, making improvements
B. Identifying a problem, testing various solutions, researching side
effects of each solution, choosing a solution, looking to improve
the solution, planning how to test the solution
C. Identifying a problem, brainstorming solutions, researching the
background of each solution, testing solutions, choosing a
solution, production, making future improvements
Stery
D. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
Organic Chemistry
General organic chemistryA sample of nitrogen gas had a volume of 500. mL, a
pressure in its closed container of 740. torr, and a
temperature of 25.0 °C. What was the new volume of
the gas when the temperature was changed to 50.0°C
and the new pressure was 760. torr?
976 mL
452 mL
528 mL
244 mL
Organic Chemistry
General organic chemistryThe prefix "heptyl" corresponds to:
a carbohydrate side-chain with seven carbons in a straight link.
a hydrocarbon side-chain with seven carbons in a straight link
none of the above.
a hydrocarbon side-chain with seven carbons with any arrangement.
a hydrocarbon with seven carbons
Organic Chemistry
General organic chemistryThe acid dissociation constant, K₂, of HNO3 is 4.0 x 104. What does the Ka
value indicate about this compound?
A. HNO3 is a strong acid.
B. HNO3 is a strong base.
C. HNO3 is a weak acid.
D. HNO3 is neither an acid nor a base.
Organic Chemistry
General organic chemistryA scientist wants to make advances in the way skin cancer patients are
treated. What is something she should do first?
A. Study the side effects of her new treatment.
B. Test people who use sunscreen to see if it actually prevents
sunburns.
C. Interview people at beaches to see how they feel about sunscreen.
D. Look at the success rate of the current treatments.
Organic Chemistry
Practical DetectionA sample of neon gas at 302 K and 0.565 atm occupies a volume of 4.91 L. If the pressure of the gas is decreased, while at the same time
it is heated to a higher temperature, the final gas volume
will be larger than 4.91 L.
could be larger or smaller than 4.91 L depending on the final pressure and temperature.
will be smaller than 4.91 L.
Organic Chemistry
HydrocarbonsThe reaction of CH3CH=CH-CH=CH₂ with excess bromine gives chiefly
a. 1,2-dibromo-3-pentene
b. 3,4-dibromo-1-pentene
C. 1,4-dibromo-2-pentene
d. a mixture of the above three compounds
e. none of the above three compounds
Organic Chemistry
General organic chemistryCu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s)
How many grams of excess reactant do you have if you react 221 grams of Cu with 575 mL of a 3.1 M AgNO3 solution?
Molar masses: Cu = 63.546 g/mole; AgNO3= 169.87 g/mole; Cu(NO3)2= 187.56 g/mole; Ag = 107.868 g/mole
The Limiting Reagent is
Therefore
will remain and its excess is
Organic Chemistry
Practical DetectionYou would like to make a solution that 38.8 L of a 2.9 M solution. You have a stock solution that is 9 M. How much your stock solution will you need
to dilute to get the solution you want?
Just the number!
Organic Chemistry
General organic chemistryWhat is represented at the triple point of water?
A. Solid, liquid, and gas phases in equilibrium
B. Solid, liquid, and gas molecules no longer interacting
C. Solid, gas, and vapor molecules changing into each other
D. Solid, liquid, and supersaturated solution in equilibrium
Organic Chemistry
Practical DetectionAccording to Le Châtelier's principle, how would a change in pressure affect a
gaseous system in equilibrium?
A. The equilibrium would shift to reduce the pressure change.
B. The number of both reactants and products would increase.
C. The equilibrium would shift in the direction of the change.
D. All equilibrium interactions would stop.
Organic Chemistry
General organic chemistrySound travels at a velocity of 333 meters per second. How long does it take for sound to travel
the length of a 100 yard football field?
How long does it take for the sound to travel the length of the football field?
0.275 s
0.28 s
0.27459 s
0.27 s
0.2746 s
Organic Chemistry
General organic chemistryWhat is Keq for the reaction N₂ + 3H₂ = 2NH3 if the equilibrium
concentrations are [NH3] = 3 M, [N₂] = 1 M, and [H₂] = 2 M?
A. Keq = 4.5
B. Keq
B. Keq = 1.5
C. Keq = 1.125
D. Keg = 0.75
Organic Chemistry
General organic chemistryThe reaction below is at equilibrium. What would happen if more Na2O2 were
added?
2Na(s) + O₂(g) → Na₂O₂ (s)
A. The equilibrium position would shift to produce more Na202.
B. The equilibrium position would shift to produce more 02.
C. The equilibrium position would shift to produce more Na2 and 0₂.
D. The equilibrium position would stay the same.
Organic Chemistry
General organic chemistryWhich of the following characterizes a reaction at equilibrium?
A. The forward reaction stops, and the backward reaction starts.
B. The reactants are changed into products.
C. The forward and backward reactions stop happening.
D. The rates of the forward and backward reactions are equal.
Organic Chemistry
General organic chemistryWhich statement about muckraking journalism is correct?
Select the best answer from the choices provided.
A. It was a feature of the Progressive Movement.
B. It investigated corruption, scandals, and corporate crime.
C. Ida B. Wells's investigation of lynching is a good example.
D.All answers are correct.
Organic Chemistry
Chemistry in Daily LifeA young scientist wants to focus on drug creation. What is one of the first
things he should do?
A. Test a composite material in the lab to see how it can be
improved.
B. Look into trends of various diseases and their effects on society.
C. Research available drugs for treating illnesses such as cancer and
heart disease, as well as the side effects of these drugs.
D. Make a plan for how to conquer a disease with drugs.
Organic Chemistry
General organic chemistryDraw the structure of a tripeptide "ADK" at physiological pH. What would be the net
charge on this molecule at this pH?