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Unit 1 Test
Chemistry
| Term | Definition |
|---|---|
| pure substance | anything that always has the same composition |
| pure substance example | water |
| heterogeneous mixture | a mixture where throughout the solution the composition is not uniform |
| heterogeneous mixture example | birdseed, ketchup, and nail polish |
| homogeneous mixture | a mixture in which the composition is uniform throughout the mixture |
| homogeneous mixture example | air, saline solution, and steel |
| homogeneous solution | solutions with uniform composition and properties throughout the solution |
| homogeneous solution example | mouthwash, maple syrup, and mild |
| 5 stages of a chemical change | color change, texture change, gas produced, precipitate is formed, temperature change |
| law of conservation of matter | matter cannot be created nor destroyed in ordinary chemical reactions. |
| law of conservation of energy | energy cannot be created nor destroyed in ordinary chemical reactions. |
| metric units for length | * meter |
| metric units for mass | * kilogram |
| metric units for temperature | * kelvin * O K is lowest temp. possible |
| chemical property | describe how the substance reacts with something else; new substance being formed |
| chemical property examples | rust, burning, and decomposition. |
| physical property | will change its physical state but not its composition; no new substance is formed |
| physical property examples | evaporating/boiling, melting, and condensing |
| intensive property | do not change with amount; are used for identification |
| extensive property | depend on the amount of matter present; these change constantly and, therefore, cannot be used for identification |
| intensive property example | color, density, boiling point, and odor |
| extensive property example | mass, volume, and length |
| element | matter composed of only one type of atom; the simplest form of matter. |
| compound | substances composed of more than one type of atom chemically joined |
Created by:
anandajenerson