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3 years ago

What conditions are needed to prevent iron from rusting?

1 answer:

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9 Ways to Prevent Rust
Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. ...
Apply Oil. ...
Apply a Dry Coating. ...
Paint the Metal. ...
Store Properly. ...
Galvanize. ...
Blueing. ...
Powder Coating.

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Choose the correct answer. The difference between the mass number of an isotope and its atomic number is:

lisabon 2012 [21]

The difference between the mass number of an isotope and its atomic number is number of neutrons.

<h3>What is atomic mass? </h3>

Atomic mass is defined as the sum of number of protons and number of neutrons of an element.

Atomic mass is represented by A.

<h3>What is Atomic number?</h3>

Atomic number is defined as the number of electron in an element.

Atomic number is represented by Z.

<h3>What is Isotopes? </h3>

Isotopes are the element which have same atomic number but have different atomic mass.

Number of proton is equal to number of electrons.

Proton is positively charged, electrons are negativity charge while neutrons are neutral in nature.

Proton and neutrons are present in the nucleus of an element. On the other hand, electron revolves around the nucleus.

For example:

The atomic mass of¹⁶₈O is 16, while of ¹⁷₈O is 17.

Neutrons = atomic mass - atomic number

Neutrons of ¹⁶₈O = 16-8 = 8

Neutrons of ¹⁷₈O = 17-8 = 9

So, they have different atomic mass and number of neutrons.

Thus, we concluded that the difference between the mass number of an isotope and its atomic number is number of neutrons.

learn more about atomic mass:

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2 years ago

Which description lists Earth's layers from most superficial to deepest?

Zanzabum

Lithosphere, asthenosfhere , lower mantle

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3 years ago

Read 2 more answers

Sugar is stirred into water to form a solution. In this case, what names do we give to the sugar and water? A. sugar is the solu

Deffense [45]

C. Sugar is the solute and water is the solvent since sugar is the one dissolving and water is what the sugar is dissolving in.

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3 years ago

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The concentration of protein in a urine sample is calculated to be 2.77 μg/mL. What is the concentration of this solution in uni

maxonik [38]

Answer:

The concentration of this solution in units of pounds per gallon is $2.776*10^{-5} \frac{lb}{gal}$

Explanation:

Units of measurement are established models for measuring different quantities. The conversion of units is the transformation of a quantity, expressed in a certain unit of measure, into an equivalent one, which may or may not be of the same system of units.

In this case, the conversion of units is carried out knowing that 1 μg are equal to 2.205*10⁻⁹ Lb and 1 mL equals 0.00022 Gallons. So

$2.77 \frac{ug}{mL} = \frac{2.77 ug}{mL}$

If 1 μg equals 2.205*10⁻⁹ lb, 2.77 μg how many lb equals?

$lb=\frac{2.77ug*2.205*10^{-9}lb }{1ug}$

lb=6.10785*10⁻⁹

So, 2.77 μg= 6.10785*10⁻⁹ lb

Then:

$2.77 \frac{ug}{mL} = \frac{2.77 ug}{mL}=\frac{6.10785*10^{-9}lb }{mL} =\frac{6.10785*10^{-9}lb }{0.00022 gal} =\frac{6.10785*10^{-9}lb }{0.00022 gal}$