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Daniel [21]
2 years ago
7

3. When substances cross cell membranes by simple diffusion, they

Chemistry
1 answer:
poizon [28]2 years ago
3 0

Answer:B

Explanation:due to osmosis and osmoregulation of the cell membrane

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C + 2H2 -> CH4
ankoles [38]

Answer:

<u>C) 4</u>

Explanation:

<u>The reaction</u> :

  • C (s) + 2H₂ (g) ⇒ CH₄ (g)

       12g      4g             16g

Hence, based on this we can say that : <u>2 moles of hydrogen gas are needed to produce 16g of methane.</u>

<u />

<u>For 32g of methane</u>

  • Number of moles of H₂ = 32/16 × 2
  • Number of moles of H₂ = <u>4</u>
4 0
1 year ago
Read 2 more answers
Explain why the electron configuration of 2-3-1 represents an atom in an excited state?
baherus [9]

Answer:

See explanation

Explanation:

If we look at the electron configuration closely, we will discover that the element must have had a ground state electron configuration of 2,4.

This is because, the innermost shell usually holds two electrons while the outer shells hold eight electrons each. The four electrons must be accommodated in the second shell in the ground state configuration of the compound.

However, when the atom is excited, one electron from this shell may move to the third shell to give the excited state configuration 2-3-1 as shown in the question.

6 0
2 years ago
Why does the designed world change?
Archy [21]
The designed world is changed regularly by inovations and new technology.
Hope I could help.
3 0
3 years ago
1. Hydrogen, Helium, Lithium?
Reika [66]

Answer:

what happened to it, have the gone extinct

6 0
3 years ago
The first electron shell of an atom is complete when it has ___ electrons and the second electron shell is complete when it has
elena-s [515]

Answer:

2, 8, 8

Explanation:

The first electron shell always has 2 electrons when it is complete. The second electron shell and 3rd shell can hold 8 when completed.

5 0
2 years ago
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