1. name the following ionic compounds.
a) naoh
b) fecl3
c) fe2(so4)3
d) zn(oh)2
e) pbo
f) nh4cl
g) sno2
2. name the following covalent compounds.
a) ph3
b) no2
c) sf6
d) p2o3
e) ocl2
f) asbr3
g) ccl4
3. identify the following compounds and mention whether they are ionic or covalent.
a) bf3
b) mg2br
c) nh4oh
d) hi
e) n2o3
f) pb3p2
g) cu(c2h3o2)2

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Accepted Answer

# Brief Explanations:
For naming ionic compounds:
- Identify the cation and anion. For cations with variable charges (like Fe, Pb, Sn), determine the charge based on the anion's charge and the compound's formula.
- For polyatomic ions (e.g., $OH^-$, $SO_4^{2 -}$, $NH_4^+$), use their standard names.
For naming covalent compounds:
- Use prefixes (mono-, di-, tri-, etc.) to indicate the number of each atom.
For identifying ionic or covalent:
- Ionic compounds usually have a metal (or $NH_4^+$) and a non - metal (or polyatomic ion). Covalent compounds have non - metals only.

## 1. Naming ionic compounds:
- a) $NaOH$: Sodium hydroxide ($Na^+$ is sodium cation, $OH^-$ is hydroxide anion)
- b) $FeCl_3$: Iron(III) chloride ($Cl^-$ is - 1, so $Fe$ is + 3)
- c) $Fe_2(SO_4)_3$: Iron(III) sulfate ($SO_4^{2 -}$ is sulfate, and using charge balance $Fe$ is + 3)
- d) $Zn(OH)_2$: Zinc hydroxide ($Zn^{2+}$ is zinc cation)
- e) $PbO$: Lead(II) oxide ($O^{2 -}$, so $Pb$ is + 2)
- f) $NH_4Cl$: Ammonium chloride ($NH_4^+$ is ammonium cation)
- g) $SnO_2$: Tin(IV) oxide ($O^{2 -}$, so $Sn$ is + 4)

## 2. Naming covalent compounds:
- a) $PH_3$: Phosphine (common name, can also be phosphorus trihydride)
- b) $NO_2$: Nitrogen dioxide
- c) $SF_6$: Sulfur hexafluoride
- d) $P_2O_3$: Diphosphorus trioxide
- e) $OCl_2$: Oxygen dichloride
- f) $AsBr_3$: Arsenic tribromide
- g) $CCl_4$: Carbon tetrachloride

## 3. Identifying ionic or covalent:
- a) $BF_3$: Covalent (B and F are non - metals)
- b) $MgBr$ (assuming it's $MgBr_2$): Ionic ($Mg$ is metal, $Br$ is non - metal)
- c) $NH_4OH$: Ionic ($NH_4^+$ is like a metal - like cation, $OH^-$ is anion)
- d) $HI$: Covalent (H and I are non - metals, but in aqueous solution it acts as ionic)
- e) $N_2O_3$: Covalent (N and O are non - metals)
- f) $Pb_3P_2$: Ionic ($Pb$ is metal, $P$ is non - metal)
- g) $Cu(C_2H_3O_2)_2$ (assuming $C_2H_3O_2^-$ is acetate): Ionic ($Cu$ is metal, acetate is polyatomic ion)

# Answer:
1.
a) Sodium hydroxide
b) Iron(III) chloride
c) Iron(III) sulfate
d) Zinc hydroxide
e) Lead(II) oxide
f) Ammonium chloride
g) Tin(IV) oxide
2.
a) Phosphine (or phosphorus trihydride)
b) Nitrogen dioxide
c) Sulfur hexafluoride
d) Diphosphorus trioxide
e) Oxygen dichloride
f) Arsenic tribromide
g) Carbon tetrachloride
3.
a) Covalent
b) Ionic
c) Ionic
d) Covalent (but in solution can be ionic)
e) Covalent
f) Ionic
g) Ionic

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Explanation:

1. Naming ionic compounds:

2. Naming covalent compounds:

3. Identifying ionic or covalent:

Answer: