Question

what is the difference between a pure substance and a mixture? what is the difference between a pure substance and a mixture? a pure substance is a substance composed of two or more different types of atoms or molecules that can be combined in fixed proportions; a mixture is a substance composed of two or more different types of atoms or molecules that can be combined in variable proportions. a pure substance is a substance composed of two or more different types of atoms or molecules; a mixture is a substance of only one type of atom or molecule. a pure substance is composed of only one type of atom or molecule; a mixture is a substance composed of two or more different types of atoms or molecules. a pure substance is a substance composed of two or more different types of atoms or molecules that can be combined in variable proportions; a mixture is a substance composed of two or more different types of atoms or molecules that can be combined in fixed proportions.

Answer 1

• A pure substance consists only of one element or one compound

• A mixture consists of two or more different substances, not chemically joined together

Pure substances have a sharp melting point but mixtures melt over a range of temperatures. This difference is most easily seen when the temperature of a hot liquid is measured as it cools and freezes.

Answer 2

A pure substance has a constant composition and set of properties, and can be an element or compound, while a mixture consists of two or more substances combined in variable proportions, maintaining their individual properties.

Step-by-step explanation:

The difference between a pure substance and a mixture lies in their composition and properties. A pure substance is a form of matter with a constant composition and properties that are the same throughout the sample. This can include both elements, composed of only one type of atom, and compounds, which consist of two or more types of atoms in fixed proportions. On the other hand, a mixture is composed of two or more types of atoms or molecules that are physically combined in variable proportions, and the composition can differ from one sample to another. Mixtures can be separated again into their pure substances without involving a chemical change, and they can be either homogeneous (the same throughout) or heterogeneous (different compositions in different parts).