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\begin{tabular}{|l|l|l|l|}
\hline
\multicolumn{1}{|c|}{Chemical Name} & \multicolumn{1}{|c|}{Chemical Formula} & \multicolumn{1}{|c|}{Chemical Name} & \multicolumn{1}{|c|}{Chemical Formula} \\
\hline
acetate & [tex]$C_2H_3O_2^{-}$[/tex] & nitrite & [tex]$NO_2^{-}$[/tex] \\
\hline
carbonate & [tex]$CO_3^{2-}$[/tex] & ammonium & [tex]$NH_4^{+}$[/tex] \\
\hline
hypocarbonite & [tex]$CO^{2-}$[/tex] & cyanide & [tex]$CN^{-}$[/tex] \\
\hline
\begin{tabular}{l}
hydrogen carbonate \\ (bicarbonate)
\end{tabular} & [tex]$HCO_3^{-}$[/tex] & hydroxide & [tex]$OH^{-}$[/tex] \\
\hline
chlorite & [tex]$ClO_2^{-}$[/tex] & peroxide & [tex]$O_2^{2-}$[/tex] \\
\hline
\end{tabular}

What is the chemical name of the compound KCN? Use the list of polyatomic ions and the periodic table to help you answer.

A. potassium carbon nitrate
B. potassium carbon nitride
C. potassium cyanate
D. potassium cyanide
E. potassium monocarbon mononitride

Sagot :

GinnyAnsweridn
To determine the correct chemical name for the compound KCN, we need to break down the compound into its ionic constituents and then match them to the given names of polyatomic ions.

1. Identify the cation (positive ion):
- KCN contains the element potassium (K), which is in Group 1 of the periodic table. This means it forms a +1 cation, [tex]\( K^+ \)[/tex].

2. Identify the anion (negative ion):
- KCN also contains the CN part. Referring to the list of polyatomic ions, the CN[tex]\( ^- \)[/tex] is identified as cyanide.

3. Combine the names:
- The compound is formed by the combination of the [tex]\( K^+ \)[/tex] ion and the [tex]\( CN^- \)[/tex] ion.
- According to the standard rules for naming ionic compounds, the name is composed of the name of the cation followed by the name of the anion.

Putting it together, the chemical name of KCN is:
- Potassium (for the [tex]\( K^+ \)[/tex] ion)
- Cyanide (for the [tex]\( CN^- \)[/tex] ion)

Thus, the correct answer is:
D. potassium cyanide
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