Which element forms the skeleton of this polymer?

"Construct a multistep synthetic route from ethylbenzene to (2-bromoethyl)benzene by dragging the appropriate items into the bin

umka2103 [35]

Answer:

The best reagents that are used for the conversion of ethylbenzene to (2-bromoethyl)benzene is shown in the first diagram attached.

Explanation:

Concepts and reason

The concept used to solve this problem is by using the given reagents, possible products will be formed in each step and then label it exactly in the given boxes in order to form the exact product.

Here, the starting reactant is ethyl benzene and the final product is (2-bromoethyl)benzene.

Fundamentals

Bromine molecule is used for bromination of alkene. Trans addition takes place.

Addition of HBr to the double bond forms an alkyl bromide.

Potassium tertiary butoxide is a sterically hindered base.

Bromination of alkane in the presence of sunlight gives radical substitution.

NBS (N-bromosuccinimide) is used for the allylic bromination.

The reaction is as shown in the second attachment(pictures 2,3 and 4).

8 0

3 years ago

What evidence did Darwin use to support his theory of evolution?

oksano4ka [1.4K]

Answer: Darwin spent five years on his journey as the ship's naturalist on the H.M.S. Beagle. Some of the evidence he used to support his theory was based on fossils he saw in South America. In the 1800's, most people were of the belief that the world was only a few thousand years old and that organisms that existed were unchanged since the beginning. However, the fossil evidence that he found showed giant versions of modern animals that no longer existed. It pointed to the idea of an ancestor that may have changed over time to the modern life forms that exist today. He also noted that the most likely place that the life forms on the Galapagos Islands could have come from originally, was Equador which was about 600 miles away. Differences in environment, food supply, temperature, etc. would put different pressures on animals on each of the various islands. Over time, natural selection would favor those best adapted for their various environments and after two million years, you have many different species that have evolved from common ancestors in Equador. The most famous of course, are Darwin's finches. Also famous are the different giant tortoises that vary by shells, size and habits, from island to island. Other famous animals include iguanas. One is extremely unique, the marine iguana, which is the only marine iguana in the entire world.

Explanation:

6 0

3 years ago

What is the chemical formula for silver sulfate

elena55 [62]

Answer:

Ag2SO4

Explanation:

4 0

3 years ago

During freezing, a substance? -loses chemical energy -loses thermal energy -gains thermal energy -gains chemical energy

Sauron [17]

The process of melting a crystalline solid can be

reversed if the liquid is cooled. The change from the liquid state

to the solid state is called freezing. As the liquid cools, it loses 

thermal energy. As a result, its particles slow down and come

closer together. Attractive forces begin to trap particles and the

crystals of a solid begin to form.

"The total kinetic energy of all the particles in a sample of

matter is called thermal energy. Thermal energy, an extensive

property, depends on the number of particles in a substance as

well as the amount of energy each particle has. If either the

number of particles or the amount of energy in each particle

changes, the thermal energy of the sample changes. With identically sized

samples, the warmer substance has a greater thermal energy."

7 0

4 years ago

Why would it be important to use a homogeneous mixture instead of a heterogeneous mixture for a

Sergio039 [100]

The correct answer is B. A homogeneous mixture has the same properties for every part of the mixture, so the quality of the material is consistent.

Explanation:

In a homogenous mixture, all the components are equally integrated; this means the final result in the case of a material is a material that looks uniform and also has the same properties in every part of section. This homogeneity and consistency are especially important if you are testing the properties of the material or using it for a specific application because if you use a homogenous mixture the quality and properties will be consistent and thus you can obtain consistent results.

6 0

3 years ago