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2 years ago

10

Which substance is a polymer found in nature? O carpet O cotton O paint O nylon

2 answers:

RideAnS [48]2 years ago

7 0

Answer:

Cotton

Explanation:

Cellulose, another natural polymer, is the main structural component of plants. Most natural polymers are condensation polymers, and in their formation from monomers water is a by-product.

Bad White [126]2 years ago

4 0

<u>Answer:</u>

<em>B. Cotton</em>

<em></em>

<u>Explanation:</u>

A polymer is a macro molecule or gaint molecule which is formed as a chain from many small molecules(which is called as a monomer).

Polymer is a repeating unit of many monomers.

For example

Ethylene or ethane formula is C2H4.

Many ethane molecules under particular temperature and pressure conditions undergo the polymerization process to form polyethene. During this process the double bond breaks and becomes single bond and produces a long chain which we call it as a polymer.

The repeating unit of Cotton polymer is called as Cellubiose which is made up of 2 glucose units.

The number of units which forms the polymer (degree of polymerization) is about 5000 cellubiose units.

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The half-life of nitrogen-13 is 10.0 minutes. if you begin with 53.3 mg of this isotope, what mass remains after 25.9 minutes ha

zimovet [89]

Hello!

The half-life is the time of half-disintegration, it is the time in which half of the atoms of an isotope disintegrate.

We have the following data:

mo (initial mass) = 53.3 mg

m (final mass after time T) = ? (in mg)

x (number of periods elapsed) = ?

P (Half-life) = 10.0 minutes

T (Elapsed time for sample reduction) = 25.9 minutes

Let's find the number of periods elapsed (x), let us see:

$T = x*P$

$25.9 = x*10.0$

$25.9 = 10.0\:x$

$10.0\:x = 25.9$

$x = \dfrac{25.9}{10.0}$

$\boxed{x = 2.59}$

Now, let's find the final mass (m) of this isotope after the elapsed time, let's see:

$m = \dfrac{m_o}{2^x}$

$m = \dfrac{53.3}{2^{2.59}}$

$m \approx \dfrac{53.3}{6.021}$

$\boxed{\boxed{m \approx 8.85\:mg}}\end{array}}\qquad\checkmark$

I Hope this helps, greetings ... DexteR! =)

3 0

3 years ago

Daniel claims that the product of two square roots of integers is always rational. His reasoning is given in the example below.

Katen [24]

Incorrect....................

6 0

3 years ago

How many kilograms of chlorine are in 21 kg of CF2Cl2

Alik [6]

21 kg x [(3 x 35.45)/(12.01 + 19.00 + (3 x 35.45))] =

21 kg x (106.35/137.36) = 16.3 kg of chlorine

You just multiply the weight of the material by the fraction of chlorine (by weight). The others are done the same way

5 0

3 years ago

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The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/daymg/day for males. Express this quantity in μg/da

Ira Lisetskai [31]

Answer:

$410mg/day *\frac{1000 ug}{1 mg}$

Recommended daily Amount (RDA) of magnesium is 410,000 μg/day.

Explanation:

There are 1000μg in 1 mg and 1000 mg in 1g

1 mg=1000μg

The Recommended daily Amount (RDA) is 410 mg/day of magnesium. Converting 410 mg/day into μg/day

$410mg/day *\frac{1000 ug}{1 mg}$

It will become 410,000 μg/day

So Recommended daily Amount (RDA) of magnesium is 410,000 μg/day.

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3 years ago

WILL GIVE BRAINLIEST ANSWER

OleMash [197]

The correct Answer based on my calculations is C

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3 years ago

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