| Term | Definition |
|---|
| physical properties | a characteristic that is observed without changing the composition (boiling point, freezing point ((density)), appearence, solubility |
| chemical properties | characteristics where you change the composition in order to observe (rusting, flammability, reaction with acid) |
| physical changes | a change in which the composition remains the same (crushing, tearing, cutting, melting, freezing, dissolving) |
| chemical changes | a change in composition (burning) |
| pure | not combined with any other substance (elements, compounds) |
| mixture | combination of substances |
| homogeneous mixture | even distribution (chocolate shake, cheerios, kool-aid) |
| heterogeneous mixture | uneven distribution (raisin bran, M&Ms, concrete, lucky charms) |
| How do you separate two liquids? | boil them. the one with the lower boiling point will evaporate and you can capture the gas and trap it. the one with the higher boiling point will remain a liquid. |
| how can you determine the identity of an unknown solid that you believe has been studied before? | examine its physical and chemical properties, compare the known to the unknown by preforming tests. |
| how can you separate two solids? | 1. filter them using water 2. melt them 3. separate them by using magnets (if one of them is magnetically charged and the other is not) |
| signs of a chemical reaction | temperature change, color change, gas production (bubbles), precipitation |
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