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Gnesinka [82]
3 years ago
10

Which statements correctly match a chemical name with its formula? Use the list of polyatomic ions and the periodic table to hel

p you answer.
The chemical formula for ammonium carbonate is NH4HCO3.
The chemical formula for ammonium hypochlorite is NH4ClO.
The chemical formula for ammonium nitrate is NH4NO3.
The chemical formula for ammonium phosphate is NH4(PO4)3.
The chemical formula for ammonium sulfate is (NH4)2SO3.

Chemistry
2 answers:
lina2011 [118]3 years ago
7 0

Answer : The correct statements are,

The chemical formula for ammonium hypochlorite is NH_4ClO.

The chemical formula for ammonium nitrate is NH_4NO_3.

The chemical formula for ammonium sulfate is (NH_4)_2SO_3.

Explanation :

Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.

(1) The chemical formula for ammonium carbonate is (NH_4)_2CO_3.

This formula is formed when the 2 ammonium ion combine with 1 carbonate ion.

(2) The chemical formula for ammonium hypochlorite is NH_4ClO.

This formula is formed when the 1 ammonium ion combine with 1 chloride ion and 1 oxide ion.

(3) The chemical formula for ammonium nitrate is NH_4NO_3.

This formula is formed when the 1 ammonium ion combine with 1 nitrate ion.

(4) The chemical formula for ammonium phosphate is (NH_4)_3PO_4.

This formula is formed when the 3 ammonium ion combine with 1 phosphate ion.

(5) The chemical formula for ammonium sulfate is (NH_4)_2SO_3.

This formula is formed when the 2 ammonium ion combine with 1 sulfate ion.

klasskru [66]3 years ago
3 0

Answer : The correct statements are,

The chemical formula for ammonium hypochlorite is NH_4ClO.

The chemical formula for ammonium nitrate is NH_4NO_3

Explanation :

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

All the polyatomic ions always form an ionic compound.

Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.

(1) The chemical formula for ammonium carbonate.

The given compound ammonium carbonate is an ionic compound. It is made up of two different ions which are ammonium ion (NH_4^+) and carbonate ion (CO_3^{2-}) by the criss-cross method. Thus, the correct chemical formula for ammonium carbonate is (NH_4)_2CO_3.

(2) The chemical formula for ammonium hypochlorite.

The given compound ammonium hypochlorite is an ionic compound. It is made up of two different ions which are ammonium ion (NH_4^+) and hypochlorite ion (ClO^{-}) by the criss-cross method. Thus, the correct chemical formula for ammonium hypochlorite is NH_4ClO.  

(3) The chemical formula for ammonium nitrate.

The given compound ammonium nitrate is an ionic compound. It is made up of two different ions which are ammonium ion (NH_4^+) and nitrate ion (NO_3^{-}) by the criss-cross method. Thus, the correct chemical formula for ammonium nitrate is NH_4NO_3.  

(4) The chemical formula for ammonium phosphate.

The given compound ammonium phosphate is an ionic compound. It is made up of two different ions which are ammonium ion (NH_4^+) and phosphate ion (PO_4^{3-}) by the criss-cross method. Thus, the correct chemical formula for ammonium phosphate is (NH_4)_3PO_4.  

(5) The chemical formula for ammonium sulfate.

The given compound ammonium sulfate is an ionic compound. It is made up of two different ions which are ammonium ion (NH_4^+) and sulfate ion (SO_4^{2-}) by the criss-cross method. Thus, the correct chemical formula for ammonium sulfate is (NH_4)_2SO_4.  

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Rank the following elements by effective nuclear charge, Zeff, for a valence electron. F LI Be B N
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Answer:

Rank in increasing order of effective nuclear charge:

  • Li < Be < B < N < F

Explanation:

This explains the meaning of effective nuclear charge, Zeff, how to determine it, and the calculations for a valence electron of each of the five given elements: F, Li, Be, B, and N.

<u>1) Effective nuclear charge definitions</u>

  • While the total positive charge of the atom nucleus (Z) is equal to the number of protons, the electrons farther away from the nucleus experience an effective nuclear charge (Zeff) less than the total nuclear charge, due to the fact that electrons in between the nucleus and the outer electrons partially cancel the atraction from the nucleus.

  • Such effect on on a valence electron is estimated as the atomic number less the number of electrons closer to the nucleus than the electron whose effective nuclear charge is being determined: Zeff = Z - S.

<u><em>2) Z eff for a F valence electron:</em></u>

  • F's atomic number: Z = 9
  • Total number of electrons: 9 (same numer of protons)
  • Period: 17 (search in the periodic table or do the electron configuration)
  • Number of valence electrons:  7 (equal to the last digit of the period's number)
  • Number of electrons closer to the nucleus than a valence electron: S = 9 - 7 = 2
  • Zeff = Z - S = 9 - 2 = 7

<u><em>3) Z eff for a Li valence eletron:</em></u>

  • Li's atomic number: Z = 3
  • Total number of electrons: 3 (same number of protons)
  • Period: 1 (search on the periodic table or do the electron configuration)
  • Number of valence electrons: 1 (equal to the last digit of the period's number)
  • Number of electrons closer to the nucleus than a valence electron: S = 3 - 1 = 2
  • Z eff = Z - S = 3 - 2 = 1.

<em>4) Z eff for a Be valence eletron:</em>

  • Be's atomic number: Z = 4
  • Total number of electrons: 4 (same number of protons)
  • Period: 2 (search on the periodic table or do the electron configuration)
  • Number of valence electrons: 2 (equal to the last digit of the period's number)
  • Number of electrons closer to the nucleus than a valence electron: S = 4 - 2 = 2
  • Z eff = Z - S = 4 - 2 = 2

<u><em>5) Z eff for a B valence eletron:</em></u>

  • B's atomic number: Z = 5
  • Total number of electrons: 5 (same number of protons)
  • Period: 13 (search on the periodic table or do the electron configuration)
  • Number of valence electrons: 3 (equal to the last digit of the period's number)
  • Number of electrons closer to the nucleus than a valence electron: S = 5 - 3 = 2
  • Z eff = Z - S = 5 - 2 = 3

<u><em>6) Z eff for a N valence eletron:</em></u>

  • N's atomic number: Z = 7
  • Total number of electrons: 7 (same number of protons)
  • Period: 15 (search on the periodic table or do the electron configuration)
  • Number of valence electrons: 5 (equal to the last digit of the period's number)
  • Number of electrons closer to the nucleus than a valence electron: S = 7 - 5 = 2
  • Z eff = Z - S = 7 - 2 = 5

<u><em>7) Summary (order):</em></u>

  Atom          Zeff for a valence electron

  • F                   7
  • Li                   1
  • Be                 2
  • B                   3
  • N                   5

  • <u>Conclusion</u>: the order is Li < Be < B < N < F
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