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3 years ago

Describe the composition of Earth’s atmosphere

1 answer:

7 0

Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere

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Suppose much of an old forest will be used for farmland. A certain portion of the land will be set aside as wildlife habitat. Yo

WITCHER [35]

Answer:

A certain portion of the land will be set aside as wildlife habitat

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2 years ago

I really need some help!!!!!!

7nadin3 [17]

The earth revolves around the Sun, which is at the centre of our solar system. The moon revolves around the earth as a natiral satellite.

Hope I helped!! xx

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3 years ago

A ____________--(also called a reductant or reducer) is an element or compound that loses (or "donates") an electron to an elect

gladu [14]

Answer:

A <u><em>reducing agent </em></u>is an element or compound that loses (or "donates") an electron to an electron recipient (oxidizing agent) in a redox chemical reaction.

Explanation:

Redox reaction is defined as the reaction in which oxidation and reduction reaction occur simultaneously.

Oxidation reaction is defined as the chemical reaction in which an atom looses its electrons. The oxidation number of the atom gets increased during this reaction.

$X\rightarrow X^{n+}+ne^-$

Reduction reaction is defined as the chemical reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

$X^{n+}+ne^-\rightarrow X$

Electrons are transferred from one atom to another in this type of reaction.

Reducing agent is defined as those substance which reduces other chemical compound and oxidizes itself by donating electrons.

Oxidizing agent is defined as those substance which oxidizes other chemical compound and reduces itself by accepting electrons.

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3 years ago

Read 2 more answers

How is diffusion used by cells? (Missed this lesson in school)

Illusion [34]

When cells need to gain or get rid of certain things, diffusion is a form of passive transport that does not require a cell to expand any energy.

6 0

3 years ago

Read 2 more answers

How does the noble gas notation work ?

aev [14]

Answer:

In explanation

Hope it helps

Explanatination:

Noble gas notation is used to summarize the electron configuration of an element while providing the most relevant information about the valence electrons of that element. The noble gases are helium, neon, argon, krypton, xenon, and radon and are found in the last column of the periodic table.

Ex: sodiums noble gas notation would be

[Ne] 3s^1

In electron configuration it would be

1s^2, 2s^2, 2p^6, 3s^1

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4 years ago