Question

1. which statement best describes a mixture? a. it is made of only one type of atom b. it has a fixed composition c. its parts can be separated by physical means d. it always involves a chemical change 8. what is the best way to separate a mixture of sand and iron filings?

Explanation:

A mixture is composed of two or more substances that are not chemically combined. Its components can be separated by physical methods like filtration, evaporation, or in the case of a magnetic - non - magnetic mixture, using a magnet. A substance made of only one type of atom is an element. A fixed - composition substance is a pure compound. And mixtures do not always involve chemical changes. For separating sand and iron filings, since iron is magnetic and sand is not, a magnet can be used to attract the iron filings.

Answer:

1. C. Its parts can be separated by physical means
2. Use a magnet to attract the iron filings.