2 years ago

The primary role of the nervous system is to:

Chemistry

1 answer:

Scrat [10]2 years ago

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Question 2 (1 point)<br>At the center of the atom is the electron.<br>True<br>False

Stells [14]

Answer:

False the electrons are on the outside of the atoms

Explanation:

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3 years ago

Which of these is true about the mantle?

yanalaym [24]

Answer:

Explanation:

it moves in slow convection currents, hope this helps!

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3 years ago

what mass of chromium (III) sulfide is produced from the reaction of 13.2 g of sulfur with excess chromium?

Andreas93 [3]

Answer: Cr2S3

Explanation:

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3 years ago

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Gallium has two naturally occurring isotopes: 69ga with a mass of 68.9256 amu and a natural abundance of 60.11% and 71ga. use th

Nataly [62]

There are two naturally occurring isotopes of gallium: mass of Ga-69 isotope is 68.9256 amu and its percentage abundance is 60.11%, let the mass of other isotope that is Ga-71 be X, the percentage abundance can be calculated as:

%Ga-71=100-60.11=39.89%

Atomic mass of an element is calculated by taking sum of atomic masses of its isotopes multiplied by their percentage abundance.

Thus, in this case:

Atomic mass= m(Ga-69)×%(Ga-69)+X×%(Ga-71)

From the periodic table, atomic mass of Ga is 69.723 amu.

Putting the values,

$69.723 amu=(68.9256 amu)(\frac{60.11}{100})+X(\frac{39.89}{100})$

Thus,

$69.723 amu=41.4312 amu+X(\frac{39.89}{100})$

Rearranging,

$X=\frac{69.723 amu-41.4312 amu}{0.3989}=70.9246 amu$

Therefore, mass of Ga-71 isotope is 70.9246 amu.

7 0

3 years ago

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Which example is an exothermic reaction?

ratelena [41]

Answer:

C. Condensation

Explanation:

When molecules release heat energy, it is called exothermic. In this case, condensation would be an example of this.

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2 years ago

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