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Jan 9, 2024
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NSB PRACTICE SETS
TOSS-UP
1) Energy
– Multiple Choice
SLAC National Accelerator Lab scientists are studying the
electrocyclic reactions that C
6
H
8
can undergo. Which of the following could NOT be
the identity of this molecule?
W) 1,3-cyclohexadiene
X) 1,4-cyclohexadiene
Y) 1,3,5-cyclohexatriene
Z) Hex-3-ene-1-yne
ANSWER: Y) 1,3,5-CYCLOHEXATRIENE
BONUS
1) Energy
– Short Answer
Department of Energy-supported researchers are studying
nitrogenase enzymes. What two metals are most commonly used to allow these enzymes to
function?
ANSWER: MOLYBDENUM AND IRON
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TOSS-UP
2) Physics
– Short Answer
Consider two parallel current-carrying wires that are exerting a
magnetic force on one another. If the current in each wire were tripled, by what factor would the
force be multiplied?
ANSWER: 9
BONUS
2) Physics
– Short Answer
Vince is flying in his spaceship when he notices a 15-kilogram
probe experiencing an apparent 30-newton force in the same direction that he's traveling. He
then notices that his ship's thrusters are on, causing his spaceship to accelerate forward
at 3 meters per second squared. In newtons, what's the magnitude of the true net force acting
upon the probe?
ANSWER: 75
NSB practice sets
Page
1
TOSS-UP
3) Math
– Multiple Choice
Consider the polynomial equation:
.
12𝑥
3
− 11𝑥
2
+ 18 = 0
According to the rational root theorem, which of the following is NOT a possible rational root of
this equation:
W) -9
X) 1/9
Y) 9
Z) -9/2
ANSWER: X) 1/9
BONUS
3) Math
– Short Answer
The perimeters of two squares differ by 16 inches, and their areas
differ by 92 square inches. What's the perimeter in inches of the larger square?
ANSWER: 54
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TOSS-UP
4) Biology
– Short Answer
What type of enzyme facilitates joining of DNA fragments whose
phosphodiester bonds have been broken by nucleases?
ANSWER: DNA LIGASE
BONUS
4) Biology –
Short Answer
Identify all of the following three statements that are true of
temperate phages: 1) They can replicate via the lytic cycle; 2) They can replicate via the
lysogenic cycle; 3) They can form a prophage.
ANSWER: ALL OF THEM
NSB practice sets
Page
2
TOSS-UP
5) Chemistry –
Short Answer
A sample of an ideal gas has a volume of one liter when its
pressure is 10 atmospheres. What will its volume be in liters when the pressure is reduced to 4
atmospheres?
ANSWER: 2.5
BONUS
5) Chemistry –
Multiple Choice
Which of the following statements is NOT true regarding
lattice energy?
W) Lattice energy is a measure of the energy contained in the crystal lattice of a compound
X) Lattice energy can be represented using a modified form of Coulomb’s law
Y) Lattice energy of a compound can be found by measuring the energy change involved in the
synthesis of the compound from gaseous ions of the component elements
Z) Sodium fluoride has a greater lattice energy than magnesium oxide
ANSWER: Z) SODIUM FLUORIDE HAS A GREATER LATTICE ENERGY THAN
MAGNESIUM OXIDE
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TOSS-UP
6) Earth and Space –
Short Answer
To two significant figures, if a star's magnitude decreases
by one unit, by what number has its brightness been multiplied?
ANSWER: 2.5
BONUS
6) Earth and Space –
Short Answer
Identify all of the following 3 minerals that are
tectosilicates, or framework silicates: 1) Quartz; 2) Amphibole; 3) Garnet.
ANSWER: 1 ONLY
NSB practice sets
Page
3
TOSS-UP
7) Energy –
Short Answer
Researchers at Brookhaven National Lab are using the STAR
detector to track particles in collisions of heavy nuclei. What phase of matter involving particles
of subunit charge is formed when these nuclei collide at high energies?
ANSWER: QUARK-GLUON PLASMA
BONUS
7) Physics –
Short Answer
What effect is observed when a potential difference across a
conductor causes a current flow perpendicular to the direction of an applied magnetic field,
resulting in an induced electric field?
ANSWER: HALL EFFECT
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TOSS-UP
8) Math –
Short Answer
A pair of 12-sided dice, each with the numbers 1 through 12 printed
on the faces, is rolled. What's the probability that the two numbers rolled are different?
ANSWER: 11/12
BONUS
8) Math –
Short Answer
In the expansion of the cube of the binomial: 2A - 3B, what is the
coefficient of the A squared B term?
ANSWER: -36
NSB practice sets
Page
4
TOSS-UP
9) Earth and Space –
Multiple Choice
Which of the following rock composition changes
could not describe a magma that is cooling and undergoing differentiation?
W) Peridotite to gabbro
X) Peridotite to diorite
Y) Granite to gabbro
Z) Diorite to granite
ANSWER: Y) GRANITE TO GABBRO
BONUS
9) Earth and Space –
Short Answer
In the Norwegian cyclone model, cold-type and
warm-type are classes of what type of front?
ANSWER: OCCLUDED
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TOSS-UP
10) Biology –
Short Answer
Aside from ATP, what other high-energy intermediate is
produced through glycolysis?
ANSWER: NADH
BONUS
10) Biology –
Multiple Choice
Jan is choosing a type of microscopy to resolve objects in her
sample that are 0.2 nanometers apart. Which of the following types of microscopes should she
use?
W) Differential interference contrast
X) Fluorescence
Y) Transmission electron
Z) Super-resolution
ANSWER: Y) TRANSMISSION ELECTRON
NSB practice sets
Page
5
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Related Questions
What is the name of this compound ?
CH2-C=C-CH3
a) 3-butyl-1,3-hexadiene-5-yne
b) 4-allyl-3-octen-6-yne
c) 4-butynyl-3,5-hexadiene
d) 5-vinyloct-5-en-2-yne
e) 3-butynyl-1,3-hexadiene
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1A
Draw the structure of the following compounds:
i) (S)-3-ethoxy-6-ethyloct-4-yne
ii)
(S)-6-methyl-3,3-dichlorocyclohex-1-ene
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The reaction of 3-methylene-1-cyclohexene and HBr yields the four products shown in the attachment. Which two are formed at high temperatures and which two are formed at low temperatures? Why? Why is 1-bromo-3-methylenecyclohexane not formed?
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Draw the structure of the following compounds.
Use line-angle structural formula.
1-bromo-4-ethyl-5-
methylcyclohexane
3,7-dimethyl-5-propylnonae
5-chloro-1-
ethylspiro[2.5]octane
2-bromo-4-
methylbicyclo[3.2.1]octane *
5-cyclobutyl-2-cyclopropyl-
6,8-diethyl-3,7,7-
trimethyldecane *
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Draw the molecular models of the compounds listed below:
a) 5-methyl-(2E, 4Z)-2,4-octadiene
b) 5-methyl-(2E, 4E)-2,4-octadiene
c) 5-methyl-(2Z, 4Z)-2,4-octadiene
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Start with the cyclohexene at the top of the page. You have a bank of structures below that you can
use below. There are more structures in the bank than you need some of the structures in the
bank are unnecessary, and some may belong in some of the unlabelled boxes.
Which structure belongs in each of the numbered boxes?
1
4
LIAIH4
NaCN
1) SOCI₂
2)
NH₂
HBr
5
6
1) Mg
2) CO2
3) H3O+
CH3OH
H*
NBS
hv
LIAIH4
2
thi
PCC
NaOH
NH₂
H*
2) LIAIH4
1) Na
2)
3
7
T
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Solve it and also tell which rules of IUPAC are you using
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3. The following alkenes can be prepared by dehydration of an appropriate alcohol. Show the
structure of the alcohol in each case. If the alkene can arise from dehydration of more than
one alcohol, show all possibilities.
CH3CH2
C=CH2
CH3CH2
a)
сH-с—снCH,CHз
CH3
b)
c)
3-hexene
d) 1,3-butadiene
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Directions: Decode the statement by finding the correct name of the structures
below. Write the letter of the correct name on the blank.
C - ethylcyclohexane
E - 1-methyl-1-cyclopentene
F- 2-pentyne
H- cyclobutene
I-2,2-dimethylpropane
м- суclohexyne
N- 2-hexene
S- 2,4-dimethyl-2-pentene
U - butane
1.
2.
3.
CH3-C-CH3
CH3
CH-f=CH-CH-CH3
ČH3
5.
6.
CH3-C=C-CH2-CH3
CH3-CH2-CH2-CH3
CH3-CH2-CH2-CH=CH-CH3
7.
8.
9.
Activity 3. What's My Name?
Directions: Study the structures below and give the correct name.
CH2
CH3-CH2-CHz-CH3
CH2
CH C=CH
CH3-CH=C-ç-CH-CH3
CH2
1.
2.
3.
6.
5.
4.
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H3C
MgBr
1. CO2
2. H3O+
product
• You do not have to consider stereochemistry.
• You do not have to explicitly draw H atoms.
• Do not include lone pairs in your answer. They will not be considered in the grading.
• Draw the Grignard reagent as a covalent magnesium bromide.
90-87
0
+
11
?
n [
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Draw a structural formula for the major organic product of the following reaction:
-CH=CH₂ + Br₂
*****
• Show product stereochemistry IF the reactant alkene has both carbons of the double bond within a ring.
• Do not show stereochemistry in other cases.
• If enantiomers are formed, just draw one.
Sn [1
CH₂Cl₂
ChemDoodle
Previous
Next
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Classify the following alkyl halide as primary, secondary, tertiary? and Why?
CH₂Cl
benzyl chloride
cr
chlorobenzene
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What is the IUPAC name for the compound shown here?
A) methylpentyne
B) 2-methyl-3-pentyne
C) 4-methyl-2-pentyne
D) 3-methyl-1-butyne
E) 2-methyl-3-butyne
+
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Please answer my question fast and be careful when you read the question
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3- Answer the following questions based on your understanding of organic reactions:
1) 1-bromohexane 2) 3-bromo-3-methyl-pentane
4) 3-bromo-2-methylpentane
3) 1-bromo-2,2-dimethylbutane
5) 2-bromo-3-methylpentane
Choose the alkyl halide(s) from the above list of C6H13Br isomers that meet each criterion below:
a) the compound(s) that can exist as enantiomers
b) the compound(s) that can exist as diastereomers
c) the compound that gives the fastest SN2 with sodium methoxide
d) the compound that is least reactive to sodium methoxide in methanol
e) the compound(s) that give only one alkene during E2
f) the compound(s) give an E2 but no SN2 reaction with sodium methoxide in methanol
g) the compound(s) that undergo SN1 reaction to give products with shifts
h) the compound that gives the fastest SN1 reaction
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CH3CH=CHCH3 and CH₂=CH₂
Draw the structural formula of the MAJOR product formed by the alkene having the HIGHER reaction rate.
• You do not have to consider stereochemistry.
• You do not have to explicitly draw H atoms.
• In cases where there is more than one answer, just draw one.
TAYY
[ ] در
ChemDoodle
Ⓡ
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N,N-diethyl-m-toluamide (DEET) is the active ingredient in many insect repellent preparations. Following is one of the steps in its synthesis. In the box below draw the
structure of the product of this reaction.
H3C
MgBr
1. CO₂
2. H₂O*
product
• You do not have to consider stereochemistry.
• You do not have to explicitly draw H atoms.
• Do not include lone pairs in your answer. They will not be considered in the grading.
• Draw the Grignard reagent as a covalent magnesium bromide.
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E2 S What is the correct IUPAC name for the following substance?
CI
(S)-1-chlorospiro[2.5]octane
(S)-7-chlorospiro[2.5]octane
(S)-2-chlorospiro[2.5]octane
(R)-2-chlorospiro[2.5]octane
(R)-7-chlorospiro[2.5]octane
(R)-1-chlorospiro[2.5]octane
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Draw a structural formula for the major product of the reaction shown.
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Please be clear in your writing
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Use the editor to format your answer
Question 26
The following compound on flipping results in:
A trans-1,4-dimethylcyclohexane (a,a)
B trans-1,4-dimethylcyclohexane (e,e)
cis-1,4-dimethylcyclohexane (e,e)
D cis-1,4-dimethylcyclohexane (a,a)
O 102 minutes remaining
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To preview the image click here
Br
O 5-bromo-3,6-dimethyl-(3Z)-heptene
O 5-bromo-3,6-dimethyl-(3E)-heptene
O 3-bromo-2,5-dimethyl-(4Z)-heptene
O 3-bromo-2,5-dimethyl-(4E)-heptene
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s
O 1-cyclohexyl-1,3,4-trimethyl-(1Z,3E)-1,3-hexadiene
6-cyclohexyl-3,4,6-trimethyl-(3E,5Z)-3,5-hexadiene
O 6-cyclohexyl-3,4,6-trimethyl-(3Z,5E)-3,5-hexadiene
1-cyclohexyl-1,3,4-trimethyl-(1E,3Z)-1,3-hexadiene
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MgBr
H3C
0 ▾ +
1. CO₂
2. H3O+
• You do not have to consider stereochemistry.
• You do not have to explicitly draw H atoms.
• Do not include lone pairs in your answer. They will not be considered in the grading.
• Draw the Grignard reagent as a covalent magnesium bromide.
n [ ]#
product
ChemDoodleⓇ
28
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Draw a structural formula for the product formed upon hydroboration/oxidation of the alkene below.
CHCH₂CH3
• Use wedge and hash bonds ONLY for rings.
• Do not show stereochemistry in other cases.
• If the reaction produces a racemic mixture, just draw one stereoisomer.
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draw the structures below:
3-cyclopropyl-5-propylcyclopentene
(4Z, 6E) - 3-bromo-4-ethyl-5-methyl
-1,4,6 octatriene
-
trans-3-hexene
cis-3-hexene
2-chloro-5-methyl-2-heptene
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Draw these molecules:
✓/3-Isopropenyl-1.4-cyclohexadiene
+
(E)-1,2,4-hexatriene
6
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Ⓒ Macmillan Learning
Draw the structural formula of (3E,5Z)-5-ethyl-3,5 - nonadiene. An alternative name for this compound is
(3E,5Z)-5-ethyInona - 3,5-diene, which follows the rules outlined in the 1993 IUPAC recommendations.
मार
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Draw a structural formula for the product formed upon hydroboration/oxidation of the alkene below.
CH3 CH3
CH3CHCHCHCH=CH2
CH3
• Use wedge and hash bonds ONLY for rings.
Do not show stereochemistry in other cases.
• If the reaction produces a racemic mixture, just draw one stereoisomer.
0
+
?
[F
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The name of compound A in Figure 5 is 1-(butan-2-yl)-3-methylcyclohexane. Use this information to determine the IUPAC name of compound B. [Numbers are separated by commas and numbers and letters by hyphens Use lower case letters and do not use spaces.] *
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Draw a structural formula for the substitution product of the reaction shown below.
H/
●
(CH3)3C
|YY
Br
ΔΟ
H
Na
• Use the wedge/hash bond tools to indicate stereochemistry where it exists.
• If more than one stereoisomer of product is formed, draw both.
Separate multiple products using the + sign from the drop-down menu.
• Products that are initially formed as ions should be drawn in their neutral forms.
SH
acetone
[F
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Estimate the heat released when ethene(CH2=CH2) reacts with HBr to giveCH3CH2Br. Bond enthalpies areC-H : 412 kJ/mol; C-C : 348 kJ/mol;C=C : 612 kJ/mol; C-Br : 276 kJ/mol;Br-Br : 193 kJ/mol; H-Br : 366 kJ/mol.
Choose the correct answer:1. 1036 kJ/mol2. 58 kJ/mol3. 424 kJ/mol4. 200 kJ/mol5. 470 kJ/mol
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N,N-diethyl-m-toluamide (DEET) is the active ingredient in many insect repellent preparations. Following is one of the steps in its synthesis. In the box below
draw the structure of the product of this reaction.
H3C
MgBr
1. CO2
2. H30*
product
• You do not have to consider stereochemistry.
• You do not have to explicitly draw H atoms.
• Do not include lone pairs in your answer. They will not be considered in the grading.
• Draw the Grignard reagent as a covalent magnesium bromide.
P
ору
aste
O O O- []#
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- What is the name of this compound ? CH2-C=C-CH3 a) 3-butyl-1,3-hexadiene-5-yne b) 4-allyl-3-octen-6-yne c) 4-butynyl-3,5-hexadiene d) 5-vinyloct-5-en-2-yne e) 3-butynyl-1,3-hexadienearrow_forward1A Draw the structure of the following compounds: i) (S)-3-ethoxy-6-ethyloct-4-yne ii) (S)-6-methyl-3,3-dichlorocyclohex-1-enearrow_forwardThe reaction of 3-methylene-1-cyclohexene and HBr yields the four products shown in the attachment. Which two are formed at high temperatures and which two are formed at low temperatures? Why? Why is 1-bromo-3-methylenecyclohexane not formed?arrow_forward
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- Solve it and also tell which rules of IUPAC are you usingarrow_forward3. The following alkenes can be prepared by dehydration of an appropriate alcohol. Show the structure of the alcohol in each case. If the alkene can arise from dehydration of more than one alcohol, show all possibilities. CH3CH2 C=CH2 CH3CH2 a) сH-с—снCH,CHз CH3 b) c) 3-hexene d) 1,3-butadienearrow_forwardDirections: Decode the statement by finding the correct name of the structures below. Write the letter of the correct name on the blank. C - ethylcyclohexane E - 1-methyl-1-cyclopentene F- 2-pentyne H- cyclobutene I-2,2-dimethylpropane м- суclohexyne N- 2-hexene S- 2,4-dimethyl-2-pentene U - butane 1. 2. 3. CH3-C-CH3 CH3 CH-f=CH-CH-CH3 ČH3 5. 6. CH3-C=C-CH2-CH3 CH3-CH2-CH2-CH3 CH3-CH2-CH2-CH=CH-CH3 7. 8. 9. Activity 3. What's My Name? Directions: Study the structures below and give the correct name. CH2 CH3-CH2-CHz-CH3 CH2 CH C=CH CH3-CH=C-ç-CH-CH3 CH2 1. 2. 3. 6. 5. 4.arrow_forward
- N,N-diethyl-m-toluamide (DEET) is the active ingredient in many insect repellent preparations. Following is one of the steps in its synthesis. In the box below draw the structure of the product of this reaction. H3C MgBr 1. CO2 2. H3O+ product • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Draw the Grignard reagent as a covalent magnesium bromide. 90-87 0 + 11 ? n [arrow_forwardDraw a structural formula for the major organic product of the following reaction: -CH=CH₂ + Br₂ ***** • Show product stereochemistry IF the reactant alkene has both carbons of the double bond within a ring. • Do not show stereochemistry in other cases. • If enantiomers are formed, just draw one. Sn [1 CH₂Cl₂ ChemDoodle Previous Nextarrow_forwardClassify the following alkyl halide as primary, secondary, tertiary? and Why? CH₂Cl benzyl chloride cr chlorobenzenearrow_forward
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