Question

which of the following compounds contains a covalent bond? * 5 points
nacl
mgo
nh3
kbr
which of the following compounds is correctly matched with its bond type * 5 points and name?
nacl - covalent bond - sodium chloride
co2 - covalent bond - carbon dioxide
mgo - ionic bond - magnesium monoxide
nh3 - ionic bond - nitrogen trihydride

Explanation:

1. First question: Covalent bonds occur between non - metals. In $NaCl$, $Na$ is a metal and $Cl$ is a non - metal, forming an ionic bond. In $MgO$, $Mg$ is a metal and $O$ is a non - metal, forming an ionic bond. In $KBr$, $K$ is a metal and $Br$ is a non - metal, forming an ionic bond. In $NH_3$, both $N$ and $H$ are non - metals, and they form covalent bonds.
2. Second question: $NaCl$ has an ionic bond, not a covalent bond. $CO_2$ has covalent bonds between carbon and oxygen atoms and is named carbon dioxide. $MgO$ is named magnesium oxide (not magnesium monoxide), and it has an ionic bond. $NH_3$ has covalent bonds, not ionic bonds.

Answer:

1. C. $NH_3$
2. B. $CO_2$ - Covalent bond - Carbon dioxide