How do pure substances and mixtures differ?

Answer 1

A pure substance has only one kind of atom or molecule.

A mixture has a number of different pure substances mixed together.

Salt- NaCl is a pure substance

Salt dissolved in water is a mixture of salt NaCl and water (H2O).

Sugar is a pure substance- sucrose

Sugar and cinnamon is a mixture of the 2 materials

In mixtures, the individual pure components can be separated - it may be difficult but it can be done.

How can you tell???

You have to stop and think about it. What kinds of materials are involved? If it is a pure component, it should only have one material/component.

Answer 2

Answer

A mixture is composed of two or more substances that are combined mechanically (as opposed to chemically). A pure substance will remain as it is no matter how fine it is divided. It's composed of "all the same thing" throughout its volume.

Note that the mixture can be two or more pure substances or two or more chemical compounds. A couple of examples are air, which is a mixture of nitrogen and oxygen (and some other things), and something like, say, sand and sawdust. The former is a mixture of pure substances or elements, while the latter is a mixture of two substances that are "complex molecules" of different substances.

Answer 3

A pure substance is a substance containing only one type of atom or compound, like nitrogen or water. A mixture is a combination of multiple different substances. Homogeneous mixtures, also known as solutions, are mixtures in which the substances are distributed uniformly so that the properties would be the same no matter where you sampled it from. One example would be salt water. Heterogeneous mixtures are combinations in which things aren't mixed evenly and so have different properties when sampled from different places. An example of this would be a box of differently colored Legos or Chocolate Chips mixed with almonds.

Answer 4

Substances-

1. Are homogeneous
2. Cannot be broken down
3. are pure

Mixtures-

1. Are heterogeneous
2. Can be broken down
3. Aren't pure

Both-

1. Both substances and mixtures are compounds
2. Both substances have more than two atoms

Answer 5

Pure substances are composed of only one chemical. However, mixtures consist of two or more substances and can be broken down into varying pure substances.

Answer 6

A mixture is also a substance you can not compare the two.