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Jet001 [13]
3 years ago
5

What percentage of the atmosphere is oxygen?

Chemistry
1 answer:
lidiya [134]3 years ago
7 0

Answer:

21%

Explanation:

It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

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Which of these best describes the relationship between density and the rate of heat transfer?
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Are all metals solid?
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Answer: No

Explanation:

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Write the resonance forms of ozone, O3, the component of the upper atmosphere that protects the Earth from ultraviolet radiation
aleksklad [387]

Answer:

The resonance forms of O3 are attached as an image.

Explanation:

A compound with different contributing structures comes together and forms a resonating or intermediate structure that best describes the properties of that compound.

The given compound is ozone, having the chemical formula  

O3 = 6 electrons * 3 = 18 electrons

O → prefers to have a complete their octet

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7 0
3 years ago
Which solution has the higher boiling point: 42.0 g c2h6o2 in 0.500 kg of h2o or 35.0 g nacl in 0.500 kg of h2o?
Lelechka [254]

Answer:

  • The NaCl solution will have higher boiling point.

Explanation:

  • C2H6O2 is a molecular substance. Meaning that when it dissolves it will remain this way:

                                  C2H6O2 ---------> C6H12O6 (aq)  

  • Sodiumchloride (NaCl) is an ionic substance. Meaning that when it dissolves, it will create ions:

                                   NaCl(s)-------> Na+(aq) + Cl- (aq)

Conclusion:

  • NaCl is an ionic compound and C2H6O2 is a molecular compound. Ionic compounds have higher boiling points than molecular compounds. Therefore, NaCl will have the higher boiling point.
6 0
3 years ago
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