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3 years ago

Which of the following best describes the amount of natural resources found here in the United States?

Chemistry

1 answer:

blsea [12.9K]3 years ago

4 0

Its A Natural resources are found in abundance in the US.

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“Enter the conjugate acids of no2- and no3-“

Rainbow [258]

Answer:

nitrit,nitrat

4 0

3 years ago

Ou have a 5 ml sample of a protein in 0.5 m nacl. you place the protein/salt sample inside dialysis tubing (see fig. 2-14) and p

Oduvanchick [21]

Answer:

Procedure (2)

Explanation:

Assume the dialyses come to equilibrium in the allotted times.

Procedure (1)

If you are dialyzing 5 mL of sample against 4 L of water, the concentration of NaCl will be decreased by a factor of

$\dfrac{5}{4000} = \dfrac{1}{800}$

Procedure (2)

For the first dialysis, the factor is

$\dfrac{5}{1000} = \dfrac{1}{200}$

After a second dialysis, the original concentration of NaCl will be reduced by a factor of

$\dfrac{1}{200} \times \dfrac{1}{200} = \dfrac{1}{40000}$

Procedure (2) is more efficient by a factor of

$\dfrac{40000}{800} = \mathbf{50}$

4 0

3 years ago

200.00 grams of an organic compound is known to contain 83.884 grams of carbon, 10.486

Dmitriy789 [7]

Explanation:

Mass of the organic compound = 200g

Mass of carbon = 83.884g

Mass of hydrogen = 10.486g

Mass of oxygen = 18.640g

The mass of nitrogen = mass of organic compound - (mass of carbon + mass of hydrogen + mass of oxygen)

Mass of nitrogen = 200 - (83.884 + 10.486 + 18.64) = 200 - 113.01‬

Mass of nitrogen = 86.99g

The empirical formula of a compound is its simplest formula.

It is derived as shown below;

C H O N

Mass 83.884 10.486 18.64 86.99

molar

mass 12 1 16 14

Moles 83.884/12 10.486/1 18.64/16 86.99/14

6.99 10.49 1.17 6.21

Divide

lowest 6.99/1.17 10.49/1.17 1.17/1.17 6.21/1.17

6 9 1 5

Empirical formula C₆H₉ON₅

learn more:

Empirical formula brainly.com/question/2790794

#learnwithBrainly

8 0

3 years ago

Which is the best description of Darwin’s theory of evolution?

Leokris [45]

Answer:

Explanation:

cfy.uhy.lobhyu444444444,.....xres;iiiiiiiiiiiuxoppppuuusxijnnhsxdrcfvtgbyhnuj

5 0

3 years ago

Read 2 more answers

A first-order reaction has a half-life of 16.7 s . How long does it take for the concentration of the reactant in the reaction t

andrew11 [14]

It takes 33.4 s for the concentration of A to fall to one-fourth of its original value.

A <em>half-life</em> is the time it takes for the concentration to fall to half its original value.

Assume the initial concentration is 1.00 mol/L. Then,

$\text{1.00 mol/L }\stackrel{\text{1st half-life }}{\longrightarrow}\text{ 0.50 mol/L } \stackrel{\text{ 2nd half-life }}{\longrightarrow}\text{0.25 mol/L}\\$

The concentration drops to one-fourth of its initial value in two half-lives.

∴ Time = 2 × 16.7 s = 33.4 s

5 0

3 years ago