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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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The molar mass of vitamin A (C20H30O).
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The equation says C20, which means there are 20 carbon atoms in each molecule of Vitamin A.  So, we multiply 12.011 by 20 to get 240.22 g/mol carbon.

Molar mass of H:  1.0079 g/mol
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The equation says O without a number, which means there is only one oxygen atom in each molecule of Vitamin A.  So, we leave O at 15.999 g/mol.

Then, just add it up:
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A certain reaction has an activation energy of 25.88 kJ/mol. At what Kelvin temperature will the reaction proceed 6.00 times fas
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2 years ago
What is the limiting reactant if 0.5 g Al is reacted with 3.5 g CuCl2?
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number of CuCl₂ moles - 3.5 g / 134.5 g/mol = 0.026 mol
if Al is the limiting reactant 
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but 0.019 mol of Al is present 
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