### Question
Can you define what chemical mixture means?


### Answer
**Chemical mixture** is defined as the following in *21 U.S.C. § 802*:

> a combination of two or more chemical substances, at least one of which is not a list I chemical or a list II chemical, except that such term does not include any combination of a list I chemical or a list II chemical with another chemical that is present solely as an impurity

#### Citation:
  - *21 U.S.C. § 802*
  - Heading: **CHAPTER 13-DRUG ABUSE PREVENTION AND CONTROL > SUBCHAPTER I-CONTROL AND ENFORCEMENT > Part A-Introductory Provisions**

