- A compound is made of two or more elements chemically combined
- A chemical compound is a kind of compound
- So, a chemical compound is made of two or more elements chemically combined

- Chlorine is a kind of element
- Sodium is a kind of element
- Therefore, sodium and chlorine are two elements

- Sodium and chlorine are two elements
- Sodium chloride is always made of chemically combined chlorine and sodium
- Hence, sodum chloride is made of two elements chemically combined

- A chemical compound is made of two or more elements chemically combined
- Sodum chloride is made of two elements chemically combined
- Therefore, sodium chloride is a kind of chemical compound

Therefore, sodium chloride is a kind of chemical compound
Question
Which substance is a compound?

Context
- Chlorine is a kind of element 
- A compound is made of two or more elements chemically combined 
- A chemical compound is a kind of compound 
- Sodium is a kind of element 
- Sodium chloride is always made of chemically combined chlorine and sodium