All categories

3 years ago

Why were scientists surprised to find coal in the arctic?

Chemistry

1 answer:

AlexFokin [52]3 years ago

3 0

Answer:

coal is made from compressed plant matter and how exactly did plants grow on the surface of an ocean. (as there is no land mass beneath the arctic.)

Explanation:

it would be like finding a fly in an ice cube to simplify it.

You might be interested in

Is poh level a acid or base

Zolol [24]

It’s a base because it has hydroxide (oh) and not just hydrogen.

8 0

3 years ago

13500 mL convert to milliliters of mercury

s344n2d4d5 [400]

Answer:

5.627 × 1019 milliliters

Explanation:

is this what you wanted?

5 0

3 years ago

Passing an electric current through a sample of water (H2O) can cause the water to decompose into hydrogen gas (H2) and oxygen g

Lerok [7]

The mass of water decomposed to produce 50 g oxygen has been 56.28 g. Thus, option D is correct.

The reaction for the decomposition of water has been:

$\rm 2\;H_2O\;\rightarrow\;H_2\;+\;O_2$

From the balanced equation, 2 moles of water decomposes to form 1 moles of hydrogen and 1 mole of oxygen.

The mass of oxygen produced has been 50 g. The moles of oxygen has been given by:

$\rm Moles=\dfrac{mass}{molar\;mass}$

The moles of oxygen has been:

$\rm Moles_O_2=\dfrac{50}{32}\;mol\\Moles_O_2=1.5625\;mol$

The moles of oxygen produced has been 1.5625 mol.

The moles of hydrogen decomposed has been given from the balanced chemical equation as:

$\rm 1 \;mole\;O_2=2\;mole\;H_2O\\1.5625\;mol\;O_2=1.5625\;\times\;2\;mol\;H_2O\\1.5625\;mol\;O_2=3.125\;mol\;H_2O$

The moles of hydrogen decomposes has been 3.125 mol.

The mass of hydrogen decomposed has been given by:

$\rm Mass=moles\;times\;molar\;mass\\Mass_{H_2O}=3.125\;\times\;18.01\;g\\Mass_{H_2O}=56.28\;g$

The mass of water decomposed to produce 50 g oxygen has been 56.28 g. Thus, option D is correct.

For more information about moles produced, refer to the link:

brainly.com/question/10606802

8 0

2 years ago

Which of the following correctly represents the electronic distribution in the Si atom? A. 2,8,3 | B. 2,3,8 | C. 2,4,8 | D. 2,8,

marin [14]

The electron distribution in the Si atom : D. 2,8,4

<h3>Further explanation</h3>

The maximum number of electrons that can be filled in the nth electron shell is 2n²(n=shell)

K shell (n = 1) maximum 2 x 1² = 2 electrons
L shell (n = 2) maximum 2 x 2² = 8 electrons
M shell (n = 3) maximum 2 x 3² = 18 electrons
N shell (n = 4) maximum 2 x 4² = 32 electrons

Electron configuration of Si : 1s² 2s2²2p6⁶3s²3p² = 14 electron

The electron distribution :

K shell = 2

L shell = 8

M shell = 4

4 0

3 years ago

How many grams of calcium hydride are needed to form 4.550 g of hydrogen gas

stealth61 [152]

Molar mass

CaH₂ = 42.0 g/mol

H₂ = 2.0 g/mol

<span>Balanced chemical equation :

</span>CaH2 + 2 H₂O = Ca(OH)₂ + 2 H₂

42.0 g CaH₂ --------------------- 4.0 g H2
? g CaH₂ ---------------------- 4.550 g H2

mass = 4.550 * 42.0 / 4

mass = 191,1 / 4

mass =<span> 47.775 g of CaH₂</span>

<span>hope this helps!</span>

4 0

3 years ago