Which statements about the formation of the solar system are true and in a correct order? A.
A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects.

B.
Most of the dust and gas contracted into a central mass—the Sun; half the mass of the cloud condensed to form Jupiter; asteroids and comets crashed into the sun to form the smaller planets.

C.
A spinning cloud of dust began to compress to form the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

D.
Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

Answers

Answer 1

Answer:

The statement about the formation of the solar system that are true and in a correct order are Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets. The answer is letter D.

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How many moles is 1.50 x 1023 molecules of NH3

Answers

1 mole ------ 6.02 x 10²³ molecules
? mole ------ 1.50 x 10²³ molecules

moles = 1.50 x 10²³ * 1 / 6.02 x 10²³

moles = 1.50 x 10²³ / 6.02 x 10²³

= 0.249 moles

hope this helps!

Which types of reactions would result in the formation of precipitate?

Answers

Answer:

Double Displacement Reaction

Explanation:

A double displacement reaction is a type of chemical reaction in which the reactant ions exchange places to form new products. Usually, a double displacement reaction results in precipitate formation.

Persamaan kimia bagi magnesium

Answers

English please ..I don't understand this.

If you begin with 1250 grams of N2 and 225 grams of H2 in the reaction that forms ammonia gas (NH3), how much ammonia will be formed? What is the limiting reagent? How much of the reagent is left when the maximum amount of ammonia is formed?(AP Chemistry summer homework packet)

Please help! Thanks. :)

Answers

N₂+3H₂⇒ 2NH₃
m(NH₃)=1250+225*2=1700 grams
N₂ is the limiting reagent.
1250 grams are left when the maximum amount of ammonia is formed.

What are the half equations that exist in thus reaction: 4Na + O2 --->2Na2O .

Answers

4Na +2e- ---->2Na2
O2 +2e- ------>2O

Calculate the pOH of a 0.410 M Ba(OH)2 solution.

Answers

The dissociation of this basic compound is: $Ba(OH)_2\ \to\ Ba^(2+) + 2OH^-$

There will be the double of $OH^-$ ions than molecules of $Ba(OH)_2$ , therefore, the concentration of $OH^-$ at the end will be 0.820 M.

$pOH = -log\ [OH^-] = - log (0.820) = \bf 0.09$

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