c. name the following compounds or ions. identify each compound as molecular or ionic:
i) no₃
ii) no₃⁻
iii) kno₃
iv) na₃n
v) alcl₃
vi) pcl₃
vii) tio
viii) mgo
ix) caco₃
x) fe₂s₃
xi) cs₂
xii) na₂s
d. which of the following formula/name pairs is correct? if incorrect, write the appropriate names
i) cr₂o₃, chromium(ll) trioxide
ii) fe(no₃)₃, iron (iii) nitrate
iii) mgoh, magnesium hydroxide
iv) k₂so₄, potassium sulfite
v) also₃, aluminium sulfide

Question

Accepted Answer

### Part c
#### i) $NO_3$
# Brief Explanations:
This is a molecular compound. The name is nitrogen trioxide.
# Answer:
Nitrogen trioxide, molecular

#### ii) $NO_3^-$
# Brief Explanations:
This is an ion. The name is nitrate ion.
# Answer:
Nitrate ion

#### iii) $KNO_3$
# Brief Explanations:
This is an ionic compound. Potassium ($K^+$) and nitrate ($NO_3^-$) ions combine. The name is potassium nitrate.
# Answer:
Potassium nitrate, ionic

#### iv) $Na_3N$
# Brief Explanations:
This is an ionic compound. Sodium ($Na^+$) and nitride ($N^{3 -}$) ions combine. The name is sodium nitride.
# Answer:
Sodium nitride, ionic

#### v) $AlCl_3$
# Brief Explanations:
This is an ionic compound. Aluminium ($Al^{3+}$) and chloride ($Cl^-$) ions combine. The name is aluminium chloride.
# Answer:
Aluminium chloride, ionic

#### vi) $PCl_3$
# Brief Explanations:
This is a molecular compound. The name is phosphorus trichloride.
# Answer:
Phosphorus trichloride, molecular

#### vii) $TiO$
# Brief Explanations:
This is an ionic compound. Titanium ($Ti^{2+}$) and oxide ($O^{2 -}$) ions combine. The name is titanium (II) oxide.
# Answer:
Titanium (II) oxide, ionic

#### viii) $MgO$
# Brief Explanations:
This is an ionic compound. Magnesium ($Mg^{2+}$) and oxide ($O^{2 -}$) ions combine. The name is magnesium oxide.
# Answer:
Magnesium oxide, ionic

#### ix) $CaCO_3$
# Brief Explanations:
This is an ionic compound. Calcium ($Ca^{2+}$) and carbonate ($CO_3^{2 -}$) ions combine. The name is calcium carbonate.
# Answer:
Calcium carbonate, ionic

#### x) $Fe_2S_3$
# Brief Explanations:
This is an ionic compound. Iron ($Fe^{3+}$) and sulfide ($S^{2 -}$) ions combine. The name is iron (III) sulfide.
# Answer:
Iron (III) sulfide, ionic

#### xi) $CS_2$
# Brief Explanations:
This is a molecular compound. The name is carbon disulfide.
# Answer:
Carbon disulfide, molecular

#### xii) $Na_2S$
# Brief Explanations:
This is an ionic compound. Sodium ($Na^+$) and sulfide ($S^{2 -}$) ions combine. The name is sodium sulfide.
# Answer:
Sodium sulfide, ionic

### Part d
#### i) $Cr_2O_3$, chromium (II) trioxide
# Brief Explanations:
In $Cr_2O_3$, oxygen is $- 2$. Let the oxidation state of $Cr$ be $x$. Using the formula $2x+3\times(- 2)=0$, $2x = 6$, $x = 3$. So the correct name is chromium (III) oxide.
# Answer:
Incorrect. Correct name: chromium (III) oxide

#### ii) $Fe(NO_3)_3$, iron (III) nitrate
# Brief Explanations:
Nitrate ($NO_3^-$) has a charge of $-1$. Let the oxidation state of $Fe$ be $x$. $x+3\times(-1)=0$, $x = 3$. The name is correct.
# Answer:
Correct

#### iii) $MgOH$, magnesium hydroxide
# Brief Explanations:
Magnesium has a charge of $+2$. Hydroxide ($OH^-$) has a charge of $-1$. The correct formula is $Mg(OH)_2$.
# Answer:
Incorrect. Correct formula: $Mg(OH)_2$

#### iv) $K_2SO_4$, potassium sulfite
# Brief Explanations:
Sulfite is $SO_3^{2 -}$, sulfate is $SO_4^{2 -}$. The correct name is potassium sulfate.
# Answer:
Incorrect. Correct name: potassium sulfate

#### v) $AlSO_3$, aluminium sulfide
# Brief Explanations:
Aluminium has a charge of $+3$. Sulfide is $S^{2 -}$. The correct formula for aluminium sulfide is $Al_2S_3$. $AlSO_3$ would be aluminium sulfite (if $SO_3^{2 -}$ is considered).
# Answer:
Incorrect. Correct formula for aluminium sulfide: $Al_2S_3$

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QUESTION IMAGE

Question

Explanation:

Part c

i) \(NO_3\)

Answer:

ii) \(NO_3^-\)