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Kamila [148]
3 years ago
8

Which of these statements accurately describes polymers?

Chemistry
2 answers:
lesya692 [45]3 years ago
3 0

Answer:

Its A.) Polymers are macromolecules

Explanation:

rosijanka [135]3 years ago
3 0

Answer:

The correct answer that you are looking for is A.) Polymers are macromolecules.

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Which of the following statements, if true, would support the claim that the NO3− ion, represented above, has three resonance st
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Answer:

One of the bonds in nitrate is shorter than the other two.

Explanation:

We would firstly need to draw the Lewis structure for nitrate anion. To do this, let's follow the standard steps:

  • calculate the total number of valence electrons: five from nitrogen, each oxygen contributes 6, so a total of 18 from oxygen atoms, as well as one from the negative charge, we have a total of 24 valence electrons;
  • assign the central atom, usually this is the atom which is single; in this case, we have nitrogen as our central atom;
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  • the number of electrons assigned is 24, so no lone pairs are present on nitrogen;
  • calculate the formal charges: each oxygen has a formal charge of -1 (formal charge is calculated subtracting the sum of lone pair electrons and bonds from the number of valence electrons of that atom); nitrogen has a formal charge of +2;
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Therefore, we may have 3 resonance structures, as this double bond might be formed with any of the 3 oxygen atoms.

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