Question

daniela wrote a table comparing pure substances and mixtures.
pure substances mixtures

• elements and compounds • contains two or more
• cannot be separated using substances

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

Explanation:

Mixtures consist of two or more substances that are physically combined, not chemically combined. Pure substances like elements and compounds have fixed compositions and cannot be separated by physical means.

Answer:

A. Mixtures are substances that are not chemically combined.