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3 years ago

An atom of selenium (Se) forms a monatomic ion. Which of the following ions does is most likely form?

Chemistry

2 answers:

Delvig [45]3 years ago

8 0

Answer:

The correct answer is Se^2-

Explanation:

The elements of group VI-A are
O, S, Se and Te.
-2 is most likely form in groups VI-A elemenst like O^2- as well as S^2-. Similarly Se also have Se^2-.

Reason:

Actually these elements have 6 valence shell electrons and they want to get 2 more electrons in order to get nearest configuration of noble gases.

Sauron [17]3 years ago

6 0

Selenium being in the same column of the periodic table, 'family', as oxygen which form oxide 0^2- and sulfur which forms sulfide S^-2.

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When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water according to the r

QveST [7]

The reaction is combination of hydrogen molecules and oxygen molecules and form water. So the oxygen and hydrogen required together is equal to the mass of the water formed.

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4 years ago

Describe the particles that make up a pure substance

Anni [7]

Answer:

Each element consists of indivisible, minute particles called atoms.

All atoms of a given element are identical.

Atoms of different elements have different masses.

Explanation:

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3 years ago

Why does the less reactive ion participate in electrolysis, instead of the higher reactive metal??

GuDViN [60]

Answer:

In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom. More reactive metals have a greater tendency to lose electrons and form positive ions .

Explanation:

Yes ur well come

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4 years ago

Discribe how an internal combustion engine works. What is drawback to the type of power?

Komok [63]

Answer:

An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber. The force of combustion is converted into mechanical energy through the use of levers and gears. The by products of combustion include energy, water vapor, carbon dioxide (CO2), nitric oxide (NO), nitrogen dioxide (NO2), and carbon monoxide (CO). The two primary drawbacks to the internal combustion engine are the primary energy source is non-renewable (fossil fuels) and the by products can have damaging effects on the environment.

Explanation:

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3 years ago

An air sample consists of oxygen and nitrogen gas as major components. It also contains carbon dioxide and traces of some rare g

jekas [21]

Explanation:

A mixture is defined as the substance that contains two or more different number of substances that are physically mixed together.

For example, a mixture of air which contains oxygen, nitrogen and other gases.

A mixture in which solute particles are unevenly distributed into the solvent then it is known as a heterogeneous mixture.

For example, sand in water is a heterogeneous mixture.

A homogeneous mixture is defined as the mixture in which solute particles are evenly distributed in a solvent.

A homogeneous mixture is a clear solution.

For example, salt dissolved in water is a homogeneous mixture.

A solution is defined as the substance in which two or more substances are mixed together.

A compound is defined as the substance that contains two or more different elements that chemically combined together in a fixed ratio by mass.

A element is defined as the substance that contains only one type of atoms.

For example, a piece of sodium element will contain only atoms of sodium.

Whereas a pure substance is defined as the substance which contains only one type of molecule or one type of atom.

For example, $O_{2}$ , $N_{2}$ etc are pure substances.

Thus, we can conclude that the terms which could be used to describe the given sample of air is as follows.

pure chemical substance.

heterogenous mixture.

mixture.

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3 years ago