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Harrizon [31]
2 years ago
5

How do we know what is inside the Earth? (How do we know the Earth has layers?)

Chemistry
1 answer:
sesenic [268]2 years ago
7 0
The earth is made up with three different layers
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An unknown element is determined to have 22 neutrons and a mass number of 40.
Amiraneli [1.4K]
It’s Calcium hope that helps!
7 0
2 years ago
Which represents the self ionization of water at 25 degrees
gayaneshka [121]
This question comes with four answer choices:

<span>A. H2O + H2O ⇄ 2H2 + O2

B. H2O + H2O⇄  H2O2 + H2

C. H2O + H2O ⇄ 4H+ + 2O2-

D. H2O + H2O ⇄  H3O+ + OH-

Answer: option </span><span>D. H2O + H2O ⇄  H3O+ + OH-

(the +sign next to H3O is a superscript, as well as the - sing next to OH)

Explanation:

The self-ionization of water, or autodissociation, produces the two ions H3O(+) and OH(-). The presence of ions is what explain the electrical conductivity of pure water.

</span><span>In this, one molecule of H2O loses a proton (H+) (deprotonates) to become a hydroxide ion, OH−. Then, he <span>hydrogen ion, H+</span>, immediately protonates another water molecule to form hydronium, H3O+.
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7 0
3 years ago
How is a line spectra created from a hot gas? a. photons are emitted when the amount of radioactive material in the gas decrease
fiasKO [112]

Answer:

c when electrons drop down from a high energy level they emit a photon.

Explanation:

4 0
1 year ago
Which of the following claims may be made based on your observations? (You will recieve negative points for wrong answers.)
Ostrovityanka [42]

Answer:

D, E and F

Explanation:

About tetrachloro cobalt complexes, the following facts have been observed  

  • Color of the tetrachloro cobalt complexes is blue.
  • They do not decompose on heating that means synthesis of tetra chloro is endothermic.

About hexa aqua cobalt complexes, the following facts have been observed  

  • Color of the hexa aqua cobalt complexes is pink color.
  • They decompose on heating and remain stable on cooling that means process of synthesis of hexa aqua cobalt complexes is exothermic.

Based on above, the correct statements are:

The correct is chloro cobalt complex is blue and aqua cobalt  

complex is pink.  

The chloro complex is favored by heating.

If the chloro complex is a product, then the reaction must be endothermic.

The correct options are D, E and F.

8 0
2 years ago
True or false atoms with fewer then 4 outer elections lend elections?
Mamont248 [21]
The answer is false ....

3 0
3 years ago
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