CHEMISTRY MIDDLE SCHOOL

Air enters and exits the lungs through the ___.aveoli
bronchi
pulmonary vein
trachea

Answers

Answer 1
Answer: the answer is aveoli
Answer 2
Answer: It would be alveoli! :)

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In a model of Earth's layers that is determined by physical properties, how might the atmosphere be classified? Would it be part of the lithosphere or a seperate layer?

Answers

Generally, the Earth is divided into spheres which include the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air). The earth is divided into three layers based on chemical composition and these are the core, mantle and crust. In addition, the earth is also divided into physical properties which include lithosphere, athenosphere, mesosphere, outer core and inner core. Based on the given details, we can conclude that the atmosphere cannot be part of the lithosphere but instead, it is classified in a separate layer. The lithosphere only consists the outermost, rigid part of the Earth, which are the crust and the mantle. Hope this answer helps.

Chromium(III) sulfate is a transition metal compound containing the metal chromium and the polyatomic ion sulfate.The oxidation state of chromium in this compound is
, and the chemical formula of the compound is

Answers

Answer:

a) oxidation number of chromium is +3

b) formula of the compound is Cr2(SO4)3

Explanation:

From the name of the compound, we can see that the oxidation state of chromium is +3

We know the sulphate ion to to be SO4^2-

According to the rules of writing the formula of compounds from valencies, the valency of chromium is 3 while that is the sulphate ion is 2.

The both species can now exchange valency

Cr2(SO4)3------- This is the correct formula of the compound

Answer:

The oxidation state is +3.

chemical formula of compound is Cr₂(SO₄)₃.

Explanation:

Calculation of oxidation state:

Cr₂(SO₄)₃

Cr= ?

The oxidation state of SO₄ = -2

2x + 3( -2) = 0

2x - 6 = 0

2x = 6

x = 6/2

x= 3

The oxidation state of Cr is +3.

The Cr has valency of 3 so three SO₄ will require while the valency of SO₄ is 2 so two Cr will require.

Cr×2 and SO₄×3

Cr₂(SO₄)₃

we know that oxidation state of Cr is +3 so (3×2) = 6

and the oxidation state of SO₄ is -2 so (-2× 3) = -6

6-6= 0

The overall charge is 0, the compound will be neutral.

I need somebody to help me with my homework pls i dont get it .

Answers

26. B
27. D
28. C
Hope this helped ☺️

How can friction be helpful when riding a bicycle and how can it be harmful

Answers

Friction can be beneficial because it helps stop a bicycle. It could be harmful when their is too much friction because it can burn the wheel. 

Al2(SO4)3 + BaCl2 balanced equation

Answers

Answer:BaCl2 + Al2(SO4)3 -->BaSO4 + AlCl3.

Explanation:

What is the ground state shorthand notation for iron (Fe)?

Answers

Answer:For Fe

Z=26

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2 3d6

Are there 26 electrons here? Why should there be 26?

So going back to the inert gas, argon ( Z=18 ), we get

[Ar] 4s2 3d6


Make sure to check your work by counting the electrons you have

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