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1 year ago

When 3-bromo-2,4-dimethylpentane is treated with sodium hydroxide, only one alkene is formed?

1 answer:

6 0

Answer: 3 bromo 2,4 dimethylpentane undergoes sn1 mechanism and hence forms a racemic mixture containing both r and s forms of the compound. in the first step that is the slow step a 2 degree carbocation is formed with positve charge at carbon 3 then it undergoes rearrangement to a 3 degree carbocation at carbon 2 from either side. as the carbocation contains 6 electrons in the outermost shell only it is sp2 hybridized and hence planar in structure, now the second step proceeds and the attack of -OH group takes place, as the -OH(hydroxyl) group can attack from either side, (top or bottom), hence a racemic mixture of 2,4 dimethyl pentan-2-ol is formed.

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When an alpha particle is emitted from an unstable nucleus, the atomic mass numberof the nucleus

barxatty [35]

Answer:

The correct option is D.

Explanation:

Radioactive substances usually emit different types of particles when they are decaying. Such particles include alpha particles, beta particles and gamma ray. When an alpha particle is emitted from an unstable radioactive nucleus such nucleus usually lost an atomic mass that correspond to that of helium atom. Note that an alpha particle is made up of two protons and two neutrons, which result in mass number of 4. Thus, a nucleus that emit an alpha particle will have its mass number (atomic mass) reduce by 4 and atomic number that is reduced by 2.

3 0

2 years ago

Which of the following does not participate in, nor is a component of, the electron transport chain? (Remember that molecules ca

Yanka [14]

Answer:

A) coenzyme A

Explanation:

The NADH and FADH₂ are the energy rich molecules which are formed in the processes like glycolysis, TCA cycle and the fatty acid oxidation as they contain pair of electrons which have very high transfer potential.

As a result of the energy produced when these molecules transfer their electrons to the oxygen , ATP is generated by a series of electron carriers which collectively is called electron transport chain (ETC).

The components of chain include Fe–S centers, Non-heme, FMN, coenzyme Q, and cytochromes . 

The energy derived from the transfer of electrons is used to pump the protons across mitochondrial membrane.

As a result, an electrochemical gradient is generated which results in some energy which is then harnessed by the ATP synthase to form ATP.

6 0

1 year ago

4. The vet instructed Manuel to give his

djverab [1.8K]

Answer:

=60 milligrams

Explanation:

12 x 5

=60 milligrams

Have a nice day!!!!!!! :-)

KA

3 0

1 year ago

There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 12.01%. Now that you have the contribution

mestny [16]

Answer: The average atomic mass of X is 16.53

Explanation:

Mass of isotope X-19 = 2.282

% abundance of isotope X-19 = 12.01% = $\frac{12.01}{100}=0.1201$

Mass of isotope X-21 = 18.48

% abundance of isotope X-21 = (100-12.01)% = $\frac{100-12.01}{100}=0.8799$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(2.282\times 0.1201)+(18.48\times 0.8799)]$

$A=16.53$

Therefore, the average atomic mass of X is 16.53

4 0

2 years ago

What is the best example of a cyclic event?

BARSIC [14]

Answer:

Explanation:

A cyclic event is one that happens repeatedly.

The appearance of Hailey's Comet is a cyclic event because it has happened in various occasions in the past on a regular schedule as predicted. We have every reason to believe that the appearance of Hailey's Comet every 75 years will continue to be happen until the comet ceases to exist.

5 0

2 years ago