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3 years ago

1. All organisms are composed of…

Chemistry

1 answer:

Vera_Pavlovna [14]3 years ago

4 0

Answer:

A. one or more cells, because they are the basic unit of life.

Explanation:

The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.

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What is the main product of the fusion reactions in our sun?

RUDIKE [14]

The sun generates its energy by nuclear fusion of hydrogen nuclei into helium.

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4 years ago

The electronegativity value depends upon the:

netineya [11]

Electronegativity is determined by factors like the nuclear charge

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3 years ago

Iron has many isotopes but only 4 are found in significant amounts in naturally found mixtures. The amounts by mass percent are:

AnnZ [28]

Answer:

The average mass of iron to be is 54.76 amu.

Explanation:

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

Mass of Fe-54 isotope = 53.9396 amu

Percentage abundance of Fe-54 = 5.845%

Fractional abundance of Fe-54 = 0.05845

Mass of Fe-56 isotope = 55.9349 amu

Percentage abundance of Fe-56 = 91.754 %

Fractional abundance of Fe-56= 0.91754

Mass of Fe-57 isotope = 56.9354 amu

Percentage abundance of Fe-57 = 2.119%

Fractional abundance of Fe-57 = 0.002119

Mass of Fe-58 isotope = 57.9333 amu

Percentage abundance of Fe-58 = 0.282%

Fractional abundance of Fe-58 = 0.00282

Average atomic mass of iron :

$=53.9396 amu\times 0.05845+55.9349 amu\times 0.91754 +56.9354 amu\times 0.002119 + 57.9333 amu\times 0.00282=54.76 amu$

The average mass of iron to be is 54.76 amu.

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3 years ago

chemical formula of a substance tells us everything below except A. The state of substance B. The quantity of the substance C. T

forsale [732]

A because it is the only one that a formula doesnt tell

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3 years ago

Read 2 more answers

Which equation correctly shows an endothermic reaction? *

Nady [450]

It’s A because +1500 kJ is before the arrow. it’s in the reactant side. so it is endothermic.

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3 years ago