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3 years ago

Which substance cannot be separated physically or chemically? a solution an element a compound a mixture

Chemistry

2 answers:

Katena32 [7]3 years ago

8 0

Answer:

An element

Explanation:

Elements are not able to be separated, but everything else can, whether that be physically or chemically.

damaskus [11]3 years ago

4 0

Answer: The substance that cannot be separated physically or chemically is an element.

Explanation:

For the given options:

A solution is defined as the solution in which the components gets completely dissolved in it. Particles are evenly spread in these solutions. They can be separated by physical means.

An element is defined as the substance which is made of similar kind of atoms. All the atoms in an element have same atomic number. The atoms cannot be separated by any physical or chemical means.

Compound is defined as a chemical specie which is made by the combination of different atoms. For Example: $NH_3,CO_2$ etc.. The atoms in a compound can be chemically separated.

A mixture is defined as the substance which is made by mixing two or more substances in any ratio. They can be separated by physical means.

Hence, the substance that cannot be separated physically or chemically is an element.

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3 years ago

Why is a terminal alkyne favored when sodium amide (NaNH2) is used in an elimination reaction with 2,3-dichlorohexane

mihalych1998 [28]

The question is incomplete, the complete question is;

Why is a terminal alkyne favored when sodium amide (NaNH2) is used in an elimination reaction with 2,3-dichlorohexane? product. A) The terminal alkyne is more stable than the internal alkyne and is naturally the favored B) The terminal alkyne is not favored in this reaction. C) The resonance favors the formation of the terminal rather than internal alkyne. D) The strong base deprotonates the terminal alkyne and removes it from the equilibrium.

E) The positions of the Cl atoms induce the net formation of the terminal alkyne.

Answer:

E) The positions of the Cl atoms induce the net formation of the terminal alkyne.

Explanation:

In this reaction, sterric hindrance plays a very important role. We know that sodamide is a strong base, it tends to attack at the most accessible position.

The first deprotonation yields an alkene. The strong base attacks at the terminal position again and yields the terminal alkyne. Thus the structure of the dihalide makes the terminal hydrogen atoms most accessible to the base. Hence the answer.

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3 years ago