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3 years ago

Which scientist was a great influence to others when he developed the heliocentric model about how the planets orbited the Sun?

1 answer:

8 0

It was'nt until the 16th century that a geometric mathematical model of heliocentric system was presented by a Renaissance mathematician, astronomer, Nicolaus Copernicus

Nicolaus Copernicus leading to the Copernican Revolution

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What is the pH of a solution whose [H⁺] is 2.7 x 10⁻⁴ M?

Firdavs [7]

Answer:

Here is the solution..Hope it helps:)

3 0

2 years ago

2S+3O2 -> 2SO3 Indicate whether S or O2 is the limiting reactant, 3mol S 4mol O, 3mol S 5mol O, 3mol S 3mol? Elemental S reac

Nina [5.8K]

Balanced chemical reaction: 2S + 3O₂ → 2SO₃.

1) Answer is: oxygen is limiting reactant.

n(S) = 3 mol; amount of sulfur.

n(O₂) = 4 mol; amount of oxygen.

From balanced chemical reaction: n(S) : n(O₂) = 2 : 3.

3 mol : n(O₂) = 2 : 3.

n(O₂) = (3 · 3 mol) ÷ 2.

n(O₂) = 4.5 mol; limiting reactant, because there is only 4 mol of oxygen.

2) Answer is: sulfur(S) is limiting reactant.

n(S) = 3 mol.

n(O₂) = 5 mol.

From balanced chemical reaction: n(S) : n(O₂) = 2 : 3.

n(S) : 5 mol = 2 : 3.

n(S) = 10 mol ÷ 3.

n(S) = 3.33 mol; there is only 3 mol of sulfur, so it is not enough.

3) Answer is: oxygen (O₂) is limiting reactant.

n(S) = 3 mol.

n(O₂) = 3 mol.

From balanced chemical reaction: n(S) : n(O₂) = 2 : 3.

3 mol : n(O₂) = 2 : 3.

n(O₂) = (3 · 3 mol) ÷ 2.

n(O₂) = 4.5 mol; limiting reactant, because there is only 3 mol of oxygen.

3 0

4 years ago

Sodium tripolyphosphate is used in detergents to make them effective in hard water. calculate the oxidation number of phosphorus

Fed [463]

Step 1:
Write molecular Formula,

Na₅P₃O₁₀
Step 2:
Assign Oxidation number to Na (which is +1) and O (which is -2), and X (unknown) for P.
(+1)₅ + (X)₃ + (-2)₁₀ = 0

Zero means overall charge on molecule is zero (Neutral).

Step 3:
Now solve for X,
(+5) + (X ÷ 3) + (-20) = 0

X ÷ 3 = -5 + 20

X ÷ 3 = +15

X = +15 ÷ 3

X = +5

Result:
Oxidation number of P is +5.

3 0

3 years ago

Which line of evidence has been traditionally accepted as conclusive proof of evolution? the presumed age of the Earth the fossi

Nataly_w [17]

The most generally accepted form of conclusive evidence for the theory of Evolution is the fossil record.

<h3>What is the theory of Evolution?</h3>

The theory of evolution was proposed by Charles Darwin.
It states that as time passes, organisms evolve to better adapt to their environments.
This is closely related to natural selection, which is considered a driving force of evolution.

<h3>How the fossil record supports this theory</h3>

The fossil record provides essential data to support this claim.
The data comes in the form of the comparison between fossils of two closely related organisms, separated by a matter of generations, that present changes in the genetic code that made them more apt for survival.

Therefore, we can confirm that the most generally accepted form of conclusive evidence for evolution is the presence of fossils that show the genetic correlation between two organisms and the progression of evolution between them.

To learn more about evolution visit:

brainly.com/question/2725702?referrer=searchResults

5 0

3 years ago

Give an example of a homogeneous mixture and an example of a heterogeneous mixture.

natta225 [31]

Answer:

Homogeneous: 1 phase, heterogeneous 2 or + phases

Explanation:

Homogeneous mixture: water + vinegar

water + ethyl alcohol

Heterogeneous mixture: water + oil.