Polymers Questions and Answers
Organic Chemistry
PolymersA person dissolves 120g of NaCl in 100mL of water. If the person dilutes their solution by adding another 300mL of water, what mass, in grams, of sodium chloride (NaCl) will be in the new solution?
12g
75.2g
120g
1200g
98.6g
Organic Chemistry
PolymersIn an alkane series of hydrocarbons, as the number of carbon atoms increases in a chain, the normal boiling point of each
successive molecule -
increases
decreases
remains the same
Organic Chemistry
PolymersWhat is the ratio of the average rate of effusion of NOF(g) to that of HBr(g) at 400 K?
YOU MUST WRITE THE CALCULATION FOR FULL CREDIT
81:49
The average rate of effusion is the same for the two gases.
7:9
9:7
49:81
Organic Chemistry
PolymersSolid aluminum (Al) and chlorine (C1₂) gas react to form solid aluminum chloride (AIC13). Suppose you have 11.0 mol of Al and 5.0 mol of Cl₂ in a reactor. What would be the limiting reactant? Enter its chemical formula below.
Organic Chemistry
PolymersWhich statement concerning proteins is not correct?
A) Proteins are long, usually folded, chains.
B) The shape of a protein molecule determines its function.
C) Proteins can be broken down and used for energy.
D) Proteins are bonded together, resulting in simple sugars.
Organic Chemistry
PolymersWhat types of lipids have been used?
triacylglycerols, glycerophospholipids
sphingolipids, glycosphingolipids, waxes
sphingolipids, steroids, prostaglandins
waxes, triacylglycerols
glycerophospholipids, sphingolipids
Organic Chemistry
PolymersFor the following reaction, 0.122 moles of bromine are mixed with 0.120 moles of chlorine gas.
bromine(g) + chlorine(g) → bromine monochloride (g)
What is the formula for the limiting reagent?
What is the maximum amount of bromine monochloride that can be produced?
Organic Chemistry
PolymersPheromones are a special type of compound secreted by the females of many insect species to attract the males for mating. One pheromone has the molecular formula C10H16O. Normally, the amount of this pheromone secreted by a female insect is about 1.60 × 10^-12 g. How many molecules does this quantity contain?
Enter your answer in scientific notation.
Organic Chemistry
PolymersThe illustration to the left represents a mixture of iodine (purple) and fluorine ( green) molecules.
If the molecules in the above illustration react to form IF3 according to the equation
I2+3 F₂ ---> 2 IF3
the limiting reagent is
the number of IF3 molecules formed is, and
the number of atoms/molecules in excess is
Organic Chemistry
PolymersThe atomic masses of 35C1 (75.53%) and 37C1 (24.47%) are 34.968 amu and 36.956 amu, respectively.
Calculate the average atomic mass of chlorine. The percentages in parentheses denote the relative
abundances.
Organic Chemistry
PolymersWhat is an autoimmune disease?
a disease caused by an immune system that cannot produce antibodies or T cell responses
a disease caused by an inappropriate immune response to self antigens
a disease caused by a severe immune response to a normally innocuous environmental antigen
a disease caused by an inappropriate immune response that overproduces cytokines to a toxic level
Organic Chemistry
PolymersGadolinium (Gd) is element 64 on the periodic table. Calculate the amount (mol) Gd in 2.54 g Gd.
Organic Chemistry
PolymersIf pressure increases, which of the following variables would decrease? Assume all other
variables are held constant.
a. Temperature
b. Moles
c. Volume
d. Both Moles & Volume
e. Both Temperature & Volume
Organic Chemistry
PolymersA sample of Sc weighs 96.7 grams. Will a sample of Be that contains the same number of atoms weigh more or less than 96.7 grams?
Calculate the mass of a sample of Be that contains the same number of atoms.
Organic Chemistry
PolymersWhat is the name of the following compound based on the Lewis-Dot structure? (SC.912.P.8.7)
a. sulfur oxide
b. sulfur trioxide
c. monosulfur oxide
d. monosulfide trioxide
Organic Chemistry
PolymersDraw the structure of each amino acid below at low pH (pH= 1), pH = 7.4 and high pH (pH = 14) and classify it as polar or nonpolar. If polar, indicate if the R group is neutral, acidic or basic. Indicate if each is hydrophobic or hydrophilic.
a. lysine
b. proline
c. valine
d. tyrosine
Organic Chemistry
PolymersWhat is the theme of this poem?
Beauty always gives Joy.
One has to lead a spiritual life.
The thoughts of people change as the season does.
Beauty can be used to raise the spirits in times of gloom.
Organic Chemistry
PolymersWhen solid red phosphorus, P4, is burned in air, the phosphorus combines with oxygen, producing a choking cloud of tetraphosphorus decoxide. Choose the unbalanced chemical equation for this reaction.
P3O2 (9)→ P4 (s) + O2(g)
P4(s) + N2₂ (9)→ P4N10 (9)
P4 (s) + O2(g) → P4O10 (9)
P4(s) + H₂O(1)→ P₂O10 (9)
Organic Chemistry
PolymersA double-blind study is one in which neither the researchers nor the subjects
know whether the subject is receiving the real treatment or the placebo. What
is the value of this kind of study?
A. The researchers cannot replace the placebo with the real
treatment for their favorite subjects.
B. Neither the subjects nor the researchers can bias the results.
C. The subjects are not irritated by the fact that they are not receiving
the real treatment.
D. Neither the subjects nor the researchers are able to interpret the
results.
Organic Chemistry
PolymersGive the symbol for each element.
a. arsenic, an element used in especially potent poisons
b. zirconium, a component in some abrasives such as sandpaper
c. rhenium, a metal used as filaments in mass spectrographs and in ion gauges
d. potassium, an essential mineral micronutrient in human nutrition
Organic Chemistry
PolymersWhich of the following can be inferred on the commonalities between Dimmesdale and Chillingworth?
(A) Dimmesdale and Chillingworth claim that Hester belongs to them
(B) Dimmesdale and Chillingworth conceal their relationship with Hester and make her the sole sufferer.
(C) Dimmesdale and Chillingworth revealed their guilt and proved that Hester is innocent
(D) Dimmesdale and Chillingworth were ready to suffer any punishment for Hester.
Organic Chemistry
Polymers"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
Organic Chemistry
PolymersWhich 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
Organic Chemistry
PolymersA 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?
Organic Chemistry
PolymersThe reaction 3O₂(g) → 2O₃ (g) with a value of △H = -286 kJ _________.
a. is endothermic and absorbs heat energy overall
b. is exothermic and releases heat energy overall
c. is spontaneous because energy is produced
Organic Chemistry
PolymersWhat term describes the structural relationship between cis-1,2 dimethylcyclopentane and trans-1,2-dimethylcyclopentane?
A) not isomers
B) constitutional isomers
C) enantiomers
D) diastereomers
E) conformers
Organic Chemistry
PolymersUsing (3) compute the crystal field splitting for each of the complex ions. Convert your answers to kJ/mol. Record these values. Finally examine each of your plots and determine if the color seen is consistent with each of the A vs. A spectra. A simple yes or no answer is not sufficient. Justify your answers.
Organic Chemistry
Polymersa) The reaction of two amino acids such as Glycine and Alanine generate a peptide bond and water as a by-product. Draw the peptide bond generated between these two Amino acids.
2- Show the resonance structure for the bond you just drawn.
Organic Chemistry
PolymersA sample has a measured temperature of 764.2 °C. What is its temperature in °F?
Organic Chemistry
PolymersHow much energy is required to raise the temperature of 12.3 grams of solid iron from 23.4°C to 36.9°C?
The specific heat of iron is 0.106 cal/g °C.
Organic Chemistry
PolymersHow many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 88.1 moles of water vapor?
Express your answer with the appropriate units.
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Organic Chemistry
PolymersMatch each variable to the corresponding scenario.
number of
moles of gas
pressure
temperature
Steve buys a helium-filled balloon for his birthday in January, On his walk home, Steve notices the
balloon seems deflated. He decides that it must be leaking, so he takes the balloon back into the
store. While in line he realizes that the balloon is not leaking after all, and has returned to its original
volume. In addition to volume, what variable changed during Steve's trip?
Steve realizes that his racquetball no longer bounces well. Instead of buying a new one, he heats up
the old one using a hair dryer. It now bounces even better than new, as long as it remains hot. In
addition to temperature, what variable changed?
Two balloons in a balloon bouquet have volumes of 2.24 L and 448 L, respectively. In addition to
volume, what variable is different for the two balloons?
A balloon containing helium gas has a pressure of 1 atm at ground level. As it rises, the pressure
decreases by 50%, but the temperature remains constant. In addition to the pressure, what variable
must have changed?
Answer Bank
volume