mixed ionic and covalent naming
12) ti(so₄)₂
13) cu(no₃)
14) crbr₂
15) cal₂
give the formulas for the following compounds:
16) copper (ii) oxide
17) potassium cyanide
18) silicon disulfide
19) phosphorus trioxide
20) disilicon tetraselenide
21) iron (ii) phosphate
22) boron trichloride
23) magnesium nitrite
24) ammonium nitride
25) selenium trichloride
26) cobalt (ii) chloride
27) sodium hydroxide
28) strontium selenide
29) lead (ii) sulfide
30) carbon disulfide

Question

Accepted Answer

# Explanation:
## Step1: Identify the elements and their charges
For ionic compounds, we need to know the charges of the cations and anions. For example, in $Cu(NO_3)$, $Cu$ (copper) can have different charges. The nitrate ion $(NO_3^-)$ has a charge of $- 1$.
## Step2: Use the criss - cross method (for ionic compounds)
For copper (II) oxide: $Cu^{2+}$ and $O^{2 - }$. Using the criss - cross method (charges as sub - scripts), we get $CuO$.
For potassium cyanide: $K^+$ and $CN^-$, so the formula is $KCN$.
For silicon disulfide: "di -" means 2. So it's $SiS_2$.
For phosphorus trioxide: "tri -" means 3. So it's $P_2O_3$.
For disilicon tetraselenide: "di -" for Si (2) and "tetra -" for Se (4), formula is $Si_2Se_4$.
For iron (II) phosphate: $Fe^{2+}$ and $PO_4^{3 - }$. Using criss - cross (sub - scripts 3 and 2), formula is $Fe_3(PO_4)_2$.
For boron trichloride: "tri -" for Cl (3), formula is $BCl_3$.
For magnesium nitrite: $Mg^{2+}$ and $NO_2^-$, formula is $Mg(NO_2)_2$.
For ammonium nitride: $NH_4^+$ and $N^{3 - }$, formula is $(NH_4)_3N$.
For selenium trichloride: "tri -" for Cl (3), formula is $SeCl_3$.
For cobalt (II) chloride: $Co^{2+}$ and $Cl^-$, formula is $CoCl_2$.
For sodium hydroxide: $Na^+$ and $OH^-$, formula is $NaOH$.
For strontium selenide: $Sr^{2+}$ and $Se^{2 - }$, formula is $SrSe$.
For lead (II) sulfide: $Pb^{2+}$ and $S^{2 - }$, formula is $PbS$.
For carbon disulfide: "di -" for S (2), formula is $CS_2$.

# Answer:
16) $CuO$
17) $KCN$
18) $SiS_2$
19) $P_2O_3$
20) $Si_2Se_4$
21) $Fe_3(PO_4)_2$
22) $BCl_3$
23) $Mg(NO_2)_2$
24) $(NH_4)_3N$
25) $SeCl_3$
26) $CoCl_2$
27) $NaOH$
28) $SrSe$
29) $PbS$
30) $CS_2$

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QUESTION IMAGE

Question

Explanation:

Step1: Identify the elements and their charges

Step2: Use the criss - cross method (for ionic compounds)

Answer: