Question

a student wrote a table comparing pure substances and mixtures.

pure substances	mixtures

| • elements and compounds

• cannot be separated using physical means | • contains two or more substances
• are chemically combined |

the student made a mistake on their table. which statement best describes the mistake made?
a. elements and compounds are considered mixtures.
b. mixtures contain at least three or more substances.
c. pure substances can be separated using physical means.
d. mixtures are substances that are not chemically combined.

Explanation:

Pure substances include elements and compounds and can't be separated by physical means. Mixtures contain two or more substances but they are not chemically combined. The incorrect statement in the table is that mixtures are chemically combined.

Answer:

D. Mixtures are substances that are not chemically combined.