The observed product mixture of 75% (S)-2-bromobutane and 25% (R)-2-bromobutane can be explained by the preference for the nucleophile to attack from the opposite side of the molecule as the bulky tert-butyl group.
The reaction of (R)-2-butanol with hydrobromic acid (HBr) proceeds through an Sn1 mechanism, which involves the formation of a carbocation intermediate. The carbocation intermediate can then be attacked by a nucleophile, in this case, Br- ion, to form the final product, 2-bromobutane.
In the Sn1 mechanism, the stereochemistry of the starting material is lost during the formation of the carbocation intermediate because it is a planar species, and there is no preference for either side of the molecule to face the nucleophile.
Thus, the nucleophile can attack the carbocation from either the top or the bottom face of the molecule with equal probability, leading to a racemic mixture of products (50:50 mixture of (R)-2-bromobutane and (S)-2-bromobutane).
However, in this case, the product mixture is not racemic, with about 75% (S)-2-bromobutane and about 25% (R)-2-bromobutane. This indicates that there must be a preference for the nucleophile to attack from one side of the molecule over the other.
This preference for one stereoisomer over the other is likely due to steric hindrance effects. Since the carbon atom bearing the leaving group (OH) has four different substituents, it is a chiral center, and the (R)-2-butanol is the enantiomer with the OH group positioned towards the rear.
In the transition state leading to the product with an (S)-configuration, the bromine attacks from the opposite side of the molecule, where there is less steric hindrance from the bulky tert-butyl group.
Conversely, in the transition state leading to the product with an (R)-configuration, the bromine attacks from the same side of the molecule as the bulky tert-butyl group, leading to greater steric hindrance, which slows down the reaction rate and reduces the yield of the product with an (R)-configuration.
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what is the meaning of resolution in science?
help me please
100% verified brainly answers to give me please.
Answer:
Resolution is the ability to distinguish two objects from each other. Light microscopy has limits to both its resolution and its magnification.
According to the enthalpy diagram below, which of the following statements is true?
Arrows A and D represent the enthalpy of the intermediate chemical reactions.
Arrow C represents the enthalpy of the overall chemical reaction.
Arrow C indicates that the third intermediate reaction is exothermic.
Arrow B indicates that the second intermediate reaction is exothermic.
According to the enthalpy diagram true statement is that Arrow C indicates that third intermediate reaction is exothermic in nature.
What is enthalpy of reaction?Enthalpy of the reaction gives idea about the exchange of heat during the whole chemical reaction process.
Arrow A and Arrow B represents that first and second intermediate reaction is endothermic.Arrow C indicates that third intermediate reaction is exothermic in nature.Hence Arrow C indicates that the third intermediate reaction is exothermic is true statement.
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Answer: c
Explanation:
Which of these is a biotic factor of an ecosystem?
A) Crystals of salt
B) Rays of sunlight
C) Grains of Sand
D) Strands of seaweed
83.0 g Lithium Cyanide (LiCN)
Can someone please convert this to molar mass and moles for 100point?
it's not a scam like I really need this done before class is done
Molar mass:-
[tex]\\ \sf\longmapsto LiCN[/tex]
[tex]\\ \sf\longmapsto 7u+12u+14u[/tex]
[tex]\\ \sf\longmapsto 21u+12u[/tex]
[tex]\\ \sf\longmapsto 33u[/tex]
[tex]\\ \sf\longmapsto 33g/mol[/tex]
Given mass=83gNo of moles=Given Mass/Molar mass
[tex]\\ \sf\longmapsto \dfrac{83}{33}[/tex]
[tex]\\ \sf\longmapsto 2.5mol[/tex]
PLEASE HELP ME!!! I AM DESPERATE!!!
What causes infrared light to hit the ground?
Answer: The water vapor, carbon dioxide, methane, and other trace gases in the earth's atmosphere absorb the longer wavelength. These are all reasons why infrared waves hit the ground.
The water vapor, carbon dioxide, methane, and other trace gases in the earth's atmosphere absorb the longer wavelength. These are all reasons why infrared waves a part of electromagnetic spectrum hit the ground.
What is electromagnetic spectrum?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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In the equation for the orbital radii in hydrogen-like atoms, a0 is called the:
Select the correct answer below:
A. energy level
B. Bohr radius
C. nuclear charge
D. orbital constant
hi too all that read this sub 2 to jelly
Answer:
I already am
Explanation:
Two atoms of Nh3 reacts with one N2 how many moles of Nh3 reacts with one 2.00 mole of N2
Explanation:
there are four (4)mole of Nh3 that react with N2
Explain how you can convert from the number of representative particles of a substance to moles of that substance.
Answer:
the number of representative contain in 1 mol of a substance equals to 6.o2x10^23 particles.Number of representative particles of a substance can be converted to moles of that substance by multiplying it by Avogadro's number as 1 mole=6.023 ×10²³.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
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Q1.
How many peaks are there in the 13C NMR spectrum of 1,4-dimethylbenzene?
A: 8
B: 4
C: 3
D: 2
Answer:
there are four peaks in the 13c NMR (B)
To solve this we must be knowing each and every concept related to NMR. Therefore, the correct option is option B among all the given options.
What is NMR?NMR spectroscopy is a form of spectroscopy that may be used to evaluate the quality or purity of such a sample as well as the molecular weight of a substance.
It really is based on the observation that now the nuclei among most atoms have spin and that all nucleus are electrically charged. NMR spectroscopy relies on the electromagnetic radiation absorption in the radiofrequency range 3kHz-300 GHz. There are four peaks in the 13C NMR spectrum of 1,4-dimethylbenzene.
It occurs at such a wavelength that corresponds to radio frequencies, and when an electron recovers from such an excited state back ground state, it produces the same frequency radio wave.
Therefore, the correct option is option B.
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Choose the aqueous solution below with the highest boiling point. These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.
A) 0.075 m NaI
B) 0.075 m (NH4)3PO4
C) 0.075 m NaBrO4
D) 0.075 m LiCN
E) 0.075 m KNO2
Answer:
B. (NH₄)₃PO₄
Explanation:
Elevation of boiling point is one of the colligative properties.
Formula is: ΔT = Kb . m . i
ΔT = Boiling T° of solution - Boiling T° of pure solvent.
i = Van't Hoff factor (numbers of ions dissolved)
Kb = Ebulloscopic constant
In this case, all the m are the same so let's dissociate the salts:
NaI → Na⁺ + I⁻ i = 2
(NH₄)₃PO₄ → 3NH₄⁺ + PO₄⁻³ i = 4
NaBrO₄ → Na⁺ + BrO₄⁻ i = 2
LiCN → Li⁺ + CN⁻ i = 2
KNO2 → K⁺ + NO₂⁻ i = 2
The biggest i would have the biggest boiling point, then B is the right answer, ammonium phosphate.
You count the i, with the moles of ions, you dissociate from the salt.
A 15.0 g piece of graphite is heated to 100.0°C and placed in a calorimeter. The
graphite releases 815.1 J of heat to reach a final temperature of 23.9°C. What is
the specific heat of graphite?
Answer:
0.714Jg^-10C^-1.
Explanation:
According to specific heat capacity, the specific heat of graphite is -0.714 J/g°C.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
In the given example, it is calculated as, c=Q/mΔT
Substituting values in above equation, c= 815.1/15×(-76.1)
c=-0.714 J/g°C
Thus, the specific heat of graphite is -0.714 J/g°C.
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Which three phenomena occur during a double slit experiment and support the wave model of light?
A-light bends around the edges of the slit.
B-light passes straight through the slit.
C-dark areas appear on the screen.
D-bright areas appear on the screen.
THERE ARE 3 ANSWERS
This is worth 100 points btw.
Answer:
Option A, A-light bends around the edges of the slit.
Atom 1 has 6 electrons. It gains 2 more electrons from atom 2 which has 5 electrons. Who will be in charge of Atom 1 and Atom 2?
Answer:
Atom 1 after gaing 2 electrons have -2 charge
And atom 2 after donating 2 electrons have +2 charge
Explanation:
What are the components of the land-based carbon cycle?
Answer:
Human exhale
Explanation:
When humans exhale-carbon is that which all humans produce=18% of all carbon output
What effect does this added energy have on the temperature, pressure, and number of collisions?
Answer: Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.
Explanation:
Table sugar and salt are examples of? A. mixtures B. elements C. atoms D. compounds
Answer:
The answer is compound because they consist of multiple things.
Do you think a chemical reaction occurs every time two substances are placed together in a reaction vessel?
Answer:
Not necessarily.
Explanation:
What are Rhodium isotopes used for?
Answer:
Rhodium is used to make electrical contacts, as jewelry and in catalytic converters, but is most frequently used as an alloying agent in other materials, such as platinum and palladium. These alloys are used to make such things as furnace coils, electrodes for aircraft spark plugs and laboratory crucibles.
Explanation:
84.9 g of solid iron reacts with oxygen gas forming iron(III) oxide. How many moles of oxygen will react
Answer:
1.14 moles of oxygen will react
Explanation:
The balanced equation of reaction between iron and oxygen is
4 Fe + 3 O₂ → 2 Fe₂O₃
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
Fe: 4 molesO₂: 3 molesFe₂O₃: 2 molesThe molar mass of iron being Fe 55.85 g/mole, then the following amount of mass reacts by stoichiometry: 4 moles* 55.85 g/mole=223.4 g
You can apply the following rule of three: if by stoichiometry 223.4 grams of Fe react with 3 moles of O₂, 84.9 grams of Fe react with how many moles of O₂?
[tex]moles of O_{2} =\frac{84.9 grams of Fe*3 moles ofO_{2} }{223.4 grams of Fe}[/tex]
moles of O₂= 1.14 moles
1.14 moles of oxygen will react
HELP I HAVE 14 MINUTES!!
Which of the following combinations go together to create true statement about subatomic particles?
a - proton
b - neutron
c - electron
d - no charge
e - positive charge
f - negative charge
g - has mass
h - has no mass
Group of answer choices
1) b, d, and h
2) a, e, and h
3) b, d, and g
4) c, d, and h
how much kg is equal to what g
Answer:
1kg= 1000 grams hope it helps
30)
Cosmologists believe that the universe is expanding and that it has been expanding since the Big Bang. Astronomers
viewing distant stars see evidence of this expansion in which phenomenon?
A)
Red shift
B)
Blue shift
Gamma pulse
D)
Background radiation
Answer:
i did this so the next person can have brainliest
Explanation:
Most of the mass of an atom is found in
Answer:
Most of the mass of an atom is found in the nucleus.
Explanation:
True or false; When Something Heats up, it moves faster, and when something cools down, It moves slower.
Answer:
This is true
Explanation:
Even at the atomic level when an element is heated up, the atoms continue to move faster and continue colliding.
The opposite happens with the cooling of elements.
3. What causes the plates to be pulled apart?
PLEASE HELP
Answer:
Hot magma rises from the mantle at mid-ocean ridges pushing the plates apart. Earthquakes occur along the fractures that appear as the plates move apart.:
what element is 1s22s22p63s23p64s23d104p65s1
Answer:
Rubidium
Explanation:
Add the exponents: 2+2+6+2+6+2+10+6+1=37
Look for the atomic number 37
The element having electronic configuration 1s₂, 2s₂, 2p₆, 3s₂, 3p₆, 4s₂, 3d₁₀, 4p₆, 5s₁ is rubidium .
What is an element ?A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
They can be identified by their particular atomic number. The periodic table groups the elements according to their atomic number and draws attention to those with related qualities.
The most vital ingredient for life is carbon. Life as we know it would not exist without this element. You'll see that carbon is the main component of the chemicals required for life.
Thus, The element having electronic configuration 1s₂, 2s₂, 2p₆, 3s₂, 3p₆, 4s₂, 3d₁₀, 4p₆, 5s₁ is rubidium .
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Can anyone tell me 5 reactions of metals with nonmetals?
non-Metals:
Nitrogen.
Oxygen.
Helium.
Sulfur.
Chlorine.
Explanation/Answer:
Metal atoms have only a few electrons in their outer shell whereas non-metal atoms have lots of electrons in their outer shell. This means that metals tend to react with non-metals. When a metal reacts with a non-metal, electrons transfer from the metal to the non-metal.
HOPE I HELPED!!
What is your observation of the relationship between m and a
Answer:
They are both letters?
Explanation:
Baking soda has a pH of 8. Its a(n) _________ substance
Acid
Neutral
Alkaline
Powdery
(god bless!! have a wonderful and blessed day!!! i love you!! and dont forget no matter what god loves you too!!!
Answer:
it's an acid
Explanation:
because itis soda