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Aneli [31]
3 years ago
5

A student made the following observations about astronomical bodies.

Chemistry
2 answers:
Paul [167]3 years ago
7 0

Answer:

  C. Both observation 1 and observation 2.

Explanation:

  The heliocentric model states that the Earth and planets revolve around the Sun at the center of the Solar System.

  Observation 1 was answered by Nicolas Copernicus, father of the heliocentrism, in 1543. The reverse effect is an illusion created because the Earth revolves faster around the Sun than Mars.

 And observation 2 also is explained by the model because the rotation of the earth made that the Stars be closer to it at different times of the year.

  I hope this answer helps you.

Lynna [10]3 years ago
7 0
I would say C. Stars would seem brighter as Earth moved nearer and the retrograde motion of Mars is due to Earth passing the planets.
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A sample of damp air in a 1.00 L container exerts a total pressure of 741.0 torr at 20 oC; but when it is cooled to -10 oC, the
AlexFokin [52]

From the information presented in the question, the number of molecules present of water present is obtained 2.41 × 10^21 molecules.

From the information we have;

Volume of the damp air =  1 L

Pressure of the damp air =  741.0 torr or 0.975 atm

Temperature of the gas = 20 oC + 273 = 293 K

R = 0.082 atm LK-1mol-1

Number of moles = ?

n =PV/RT

n = 0.975 × 1/0.082 ×  293

n = 0.041 moles

Volume of water vapor = 1 L

Temperature of water = -10 oC + 273 = 263 K

Pressure of the gas = 607.1 torr or 0.799 atm

R = 0.082 atm LK-1mol-1

n= PV/RT

n = 0.799 × 1/ 0.082 × 263

n = 0.037 moles

Number of moles of water = 0.041 moles -  0.037 moles = 0.004 moles

If 1 mole = 6.02 × 10^23 molecules

0.004 moles = 0.004 moles × 6.02 × 10^23 molecules/1 mole

= 2.41 × 10^21 molecules

Learn more: brainly.com/question/2510654

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3 years ago
Helppp plss
wlad13 [49]

Answer:

Earth's atmosphere contains a huge pool of nitrogen gas (N2). But this nitrogen is “unavailable” to plants, because the gaseous form cannot be used directly by plants without undergoing a transformation. To be used by plants, the N2 must be transformed through a process called nitrogen fixation.

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2 years ago
A molecule is made up of two or more chemically bonded atoms. true or false
Inessa05 [86]
True because molo means two so you would need more than 1 atom 
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3 years ago
How were the Great Lakes formed?
cluponka [151]

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The Great Lakes were formed by a retreating glacier that dug out large basins. Then as the glacier melted, the water filled in those basins

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This exercise uses the radioactive decay model.
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3 years ago
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