1. Matter Combines to Form Different Substances
Ch 1.3
Matter Combines to Form Different Substances

2. Pure Substances

3. A pure substance has either the same elements (atoms) or the same molecules that are bonded together in specific proportions. Example: H2O water

4. The atoms are chemically combined (bonded).
They cannot be separated physically.
Compound properties are different from the properties of the individual elements.

5. Pure substances can either be elements or compounds.

6. Elements
An element is a pure substance that is made out of all the same atoms.
Example: Helium

7. Compounds
A compound is a pure substance that is made out of 2 or more different atoms.
Example: H2O2 Hydrogen peroxide

8. Circle your level of understanding of these concepts:

9. Mixtures

10. A mixture is a combination of two or more substances where there is no chemical combination or reaction.

11. Mixtures combine physically in no specific proportions. They just mix.

12. Most natural substances are mixtures.
Can be physically separated into pure compounds or elements.
Combine in varied proportions, it makes no difference.

13. When you create a mixture, there are no new substances formed
When you create a mixture, there are no new substances formed. Each part of a mixture keeps its own properties.

14. Circle your level of understanding of these concepts:

15. Solutes & Solvents
Solids, liquids and gases can be combined to create a mixture. You make a mixture by adding at least one substance to another.

16. When you add a material to a gas or liquid, the material you are adding is called the solute and the material you are adding to is called the solvent. Example: Salt water; salt is the solute and water is the solvent.

17. Classification of Mixtures
Mixtures can be classified into three types: suspension, colloidal, and solution. Most mixtures are heterogeneous suspension mixtures.

18. Mixtures can be heterogeneous or homogeneous
Mixtures can be heterogeneous or homogeneous. The prefix “homo-” means the same. The prefix “hetero-” means difference.

19. Heterogeneous mixtures are those where the substances are not distributed evenly. There are visibly different substances or phases.

20. A suspension is a heterogeneous mixture with large particles.
These particles are visible and will settle out left standing still.
Examples: pond water, fine sand, or Italian salad dressing

21. Homogeneous mixtures are those where the materials are evenly distributed throughout. Example: Air

22. Solutions are homogeneous mixtures that consist of microscopic particles and evenly spread out molecules. Examples: colored water, salt water, kool-aid

23. Colloidal mixtures are in between a suspension and solution
Colloidal mixtures are in between a suspension and solution. The ingredients in colloidal mixtures are smaller and usually homogeneous. Examples: milk, jello, fog

24. Circle your level of understanding of these concepts: