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Unit 3
Pure Substances and Mixtures Notes
| Term | Definition |
|---|---|
| atoms | the smallest unit of an element that maintains the properties of that element. |
| element | made up of one or more of the same kind of atom chemically combined. |
| compound | made up of different kinds of atoms chemically combined. |
| mixture | contains a variety of elements and compounds that are not chemically combined with each other. |
| acids | have a pH value below 7. Example: Vinegar. |
| bases | have a pH value above 7. Example: Baking Soda |
| neutral | has a pH value of 7. Example: Water/Salt |
| heterogeneous mixture | one that does not have a uniform composition. |
| homogeneous mixture | substances are evenly spread throughout the mixture. |
| suspension | a heterogeneous mixture in which the particles of a material are spread throughout a liquid or gas but are too large to stay mixed without being stirred or shaken. Example: a snow globe or oil and vinegar salad dressing. |
| solution | a type of homogeneous mixture in which one substance is dissolved into another substance. Example: sweet tea or Kool-Aid |
| colloid | a heterogeneous mixture in which small particles are spread throughout a liquid or gas, but they do not settle out quickly. Example: Jell-O or milk |
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