What are the components of clean air?

Answers

Answer 1
Answer: Using information I've learned doing GCSE core science, the air should contain:

78% Nitrogen (N2)
21% Oxygen (02)
0.035% Carbon Dioxide (CO2)
Fluctuating proportions of noble gases (such as argon) and water vapour

There are also trace amounts of many other gases.
Answer 2
Answer: In clean air there are 5 elements present.
Argon
Carbon Dioxide
Nitrogen
Oxygen
and Hydrogen
Hope this helps! :)

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Which items are minerals or contain minerals? Check all that apply.asap please:)
-lawn fertilizer

-topsoil

-a diamond necklace

-a copper electrical wire

-a cellular phone

Answers

Answer:

Hey dude....

Explanation:

This is ur answer.....

Check all because all of them contain minerals.....

Hope it helps!

Brainliest pls!

Follow me! :)

Answer:

lawn fertilizer, topsoil, and a diamond necklace

Explanation:

lawn fertilizer and topsoil are coming out of the ground, therefore some amount of minerals will be in them, such as iron added to it to make whatever its going on grow stronger.

a diamond necklace is a jewel that is coming out of the ground. it is categorized as a raw mineral.

I'm not 100 percent sure about the copper wire and the cell phone.

I do belive copper is a mineral.

The temperature at which a substance in the liquid phase transforms to the gaseous phase refers to the substance's _______. A. sublimation point B. boiling point C. melting point D. freezing point

Answers

When a substance goes from being a liquid to a gas it evaporates, or boils away. Think of boiled eggs.

Any part of an experiment that cannot be changed is considered to be a(n)

Answers

The answer is a Constant

Write the pressure equilibrium constant expression for this reaction. 2CO2 (g) + 4H2O (g) → 2CH3OH (l) + 3O2 (g)

Answers

Answer:

The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.

Explanation:

  • For the reaction:

2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g).

The pressure equilibrium constant (Kp) = the product of the pressure of the products side components / the product of the pressure of the reactantss side components.

each one is raised to a power equal to its coefficient.

∴ The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.

There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification?Choose all answers that are correct.

A.Class

B.Order

C.Family

D.Level

Answers

A) The class and C) Family would be the only accurate option. Here are the levels from largest to smallest: kingdom, phylum, class, order, family, genus and species.

sodium chloride is made up of sodium and chlorine, but it isn't a poisonous gas and it doesn't explode in water. explain why.

Answers

sodium chloride is a compound that is stable because its constituent elements namely chlorine and sodium have formed ionic bonds with each other and their outer energy shells are filled with 8 electrons. 

Sodium on its own  has 11 electrons. Two of these are in the 1st energy level, eight in the 2nd energy level and one in the 3rd energy level. This arrangement is highly unstable rendering the element sodium highly unstable and reactive. It will burst into flames immediately on exposure to air and can burn through human flesh if it comes into contact with it.

Chlorine at room temperature is a poisonous gas. It has 17 electrons in the arrangement 2:8:7 . The outermost shell has 7 electrons and so this element is fairly stable but will readily react with human lungs with fatal consequences.

So each of these two elements on their own are deadly, but when the two react together, sodium gives up its single electron on the outer energy shell to chlorine which readily accepts it and fills its outer shell to make 8  forming ionic bonds and is thus  the two are completely stable and cannot explode or react in any other way because the outer shell of each of them is now filled with 8 electrons.