Question

chemical compounds
atoms may exist singly or be joined together. molecule is the general term used to describe any atoms that are connected by covalent chemical bonds. diatomic atoms like hydrogen and oxygen are not compounds because they are composed of only one element. carbon dioxide, on the other hand, is a compound because it is composed of carbon and oxygen atoms in a definite proportion. there are two main types of chemical bonds that hold atoms together: covalent and ionic. atoms that share electrons in a chemical bond have covalent bonds. ionic bonds occur when electrons are transferred from one atom to another.
consider the image in the prompt. which container represents a compound?
a na and cl
b n₂
c h₂o
d h₂ and h₂o
review the chemical reaction represented here in the chemical equation. what is the reason for including the subscript in the chemical formula for water?
a the subscript 2 shows the formation of two water molecules

Explanation:

A compound is a substance made up of two or more different types of atoms chemically bonded together. Sodium (Na) and Chlorine (Cl) are elements, $N_2$ is a di - atomic molecule of an element (nitrogen), and a mixture of $H_2$ and $H_2O$ is a combination of an element and a compound. Water ($H_2O$) is a compound as it is made of hydrogen and oxygen atoms chemically bonded. In the chemical formula $H_2O$, the subscript 2 indicates that there are two hydrogen atoms for every one oxygen atom in a water molecule.

Answer:

1. Which container represents a compound? C. $H_2O$
2. What is the reason for including the subscript in the chemical formula for water? The subscript "2" indicates that there are two hydrogen atoms for every one oxygen atom in a water molecule.