Question

question 10. describe the process you would use to determine whether a substance is a pure substance or a mixture. provide specific examples of each type and explain how you would differentiate between them in a laboratory setting

Explanation:

A pure substance has a fixed composition and distinct properties. For example, water (H₂O) is a pure substance. In a lab, it has a constant melting and boiling point. A mixture is composed of two or more substances physically combined. For instance, salt - water solution. To differentiate, we can use techniques like evaporation. For a pure substance like water, evaporation leaves no residue. For a salt - water mixture, salt will be left behind after water evaporates. Also, we can use filtration for heterogeneous mixtures (e.g., sand - water mixture where sand can be filtered out).

Answer:

To determine if a substance is pure or a mixture, we can use physical separation techniques like evaporation and filtration and observe properties such as melting/boiling points. Pure substance examples: water, gold. Mixture examples: salt - water solution, sand - water mixture. In a lab, pure substances have constant melting/boiling points and leave no residue after evaporation (if it's a liquid pure substance), while mixtures can be separated by physical means and may have variable melting/boiling points and leave residues after evaporation.