To determine which of the given molecules are compounds, we need to understand what qualifies as a compound. A compound is a substance composed of two or more different elements that are chemically bonded together.
Given the options:
1. [tex]\( \text{NaHCO}_3 \)[/tex]
2. [tex]\( \text{O}_3 \)[/tex]
3. [tex]\( \text{Cl}_2 \)[/tex]
4. [tex]\( \text{C}_8 \text{H}_{18} \)[/tex]
Let's analyze each:
1. [tex]\( \text{NaHCO}_3 \)[/tex] (sodium bicarbonate): This compound consists of sodium (Na), hydrogen (H), carbon (C), and oxygen (O). Since it is made up of more than one type of element, it is a compound.
2. [tex]\( \text{O}_3 \)[/tex] (ozone): This molecule consists only of oxygen atoms (O). Since it is composed of only one type of element, it is not a compound, but rather a molecular form of an element.
3. [tex]\( \text{Cl}_2 \)[/tex] (chlorine gas): This molecule consists only of chlorine atoms (Cl). Since it is composed of only one type of element, it is not a compound, but rather a molecular form of an element.
4. [tex]\( \text{C}_8 \text{H}_{18} \)[/tex] (octane): This compound consists of carbon (C) and hydrogen (H). Since it is made up of more than one type of element, it is a compound.
Thus, the two molecules that are compounds are:
- [tex]\( \text{NaHCO}_3 \)[/tex]
- [tex]\( \text{C}_8 \text{H}_{18} \)[/tex]
Therefore, the correct answers are:
- [tex]\( \text{NaHCO}_3 \)[/tex]
- [tex]\( \text{C}_8 \text{H}_{18} \)[/tex]
