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spayn [35]
3 years ago
10

Which of the following statements does not accurately describe Precambrian Earth?

Chemistry
2 answers:
8_murik_8 [283]3 years ago
6 0

Answer:

C. The ocean water was salty and rich in dissolved oxygen.  

Explanation:

The oldest and longest of the Geological Ages, the Pre-Cambrian extends from the formation of the Earth, approximately 4.5 billion years ago, to 570 million years ago.

This period begins with the formation of the Earth about 4.5 billion years ago, where the Earth was an incandescent mass with rivers of dissolved rock, erupting volcanoes and large amount of sulfur. The atmosphere was initially similar to the atmosphere of Mars and Venus and was composed of nitrogen, ammonia, hydrogen, carbon monoxide, methane and water vapor, expelled by volcanoes, and no sign of oxygen.

After 700 million years, most of the rocks on the surface of the earth had already been cooled and a large amount of water had condensed into an ocean. Even so, the volcanic eruptions were still constant and were giving rise to several islands that were pushed toward each other by the movement of the mantle. In this period small unicellular beings in the ocean begin to appear, the primitive algae and bacteria that assimilate the carbon dioxide of the atmosphere transforming it into free oxygen, slowly changing the composition of the atmosphere that, in that period, was composed basically by nitrogen and steam of Water. They are of this period the oldest fossils of the earth.

Ilya [14]3 years ago
3 0

c. the ocean water was salty and rich in dissolved oxygen

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Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300.0-g sample? 3 g 18.75 g 3
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Amount of Niobium-91 initially
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Need help assap <br> Will give brainly
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C!

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2 years ago
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An acetylene tank has a volume of 390.0 L. It is stored at a temperature of 23.5 °C and has a
xeze [42]

Considering the ideal gas law,  there are 279.42 moles of acetylene in the tank.

<h3>Definition of ideal gas</h3>

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

<h3>Ideal gas law</h3>

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

<h3>Moles of acetylene</h3>

In this case, you know:

  • P= 1765 kPa= 17.4192 atm (being 101.325 kPa= 1 atm)
  • V= 390 L
  • n= ?
  • R= 0.082 \frac{atmL}{molK}
  • T= 23.5 °C= 296.5 K (being 0 °C= 273 K)

Replacing in the ideal gas law:

17.4192 atm× 390 L = n×0.082 \frac{atmL}{molK}× 296.5 K

Solving:

n=\frac{17.4192 atmx 390 L}{0.082 \frac{atmL}{molK}x296.5 L}

<u><em>n= 279.42 moles</em></u>

Finally, there are 279.42 moles of acetylene in the tank.

Learn more about ideal gas law:

brainly.com/question/4147359

4 0
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<u>Answer: </u><em>B. Adding more protons to a positively charged body until the number of protons matches the number of electrons</em>

Option B is the appropriate response  

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