Question

if a sample of matter can be separated and is not uniform in composition, then is considered to be ___.

○ a compound

○ an element

○ a heterogeneous mixture

○ a homogeneous mixture

Explanation:

1. Recall the definitions:

• An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. So it's not an element.
• A compound is a pure substance made of two or more elements chemically combined, and it has a uniform composition. So it's not a compound.
• A homogeneous mixture has a uniform composition throughout (like salt water).
• A heterogeneous mixture has a non - uniform composition and its components can be separated (like a mixture of sand and water).

1. The sample in the question can be separated and has a non - uniform composition, which matches the definition of a heterogeneous mixture.

Answer:

C. a heterogeneous mixture