1. Endothermic: a chemical reaction that absorbs heat.

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Presentation transcript:

1. Endothermic: a chemical reaction that absorbs heat

2.Exothermic: a chemical reaction that releases heat.

3.Pure Substance: a substance that appears to be made of only one thing.

4. Volume: the amount of space an object takes up.

5. Displacement: the movement of liquid caused by the volume of a solid object.

6. Soluble: Able to be dissolved in a solvent (water) **Insoluble

7. Immiscible: not able to evenly mix.

8. Dissolve: to form a solution (evenly mixed, one color) by mixing a substance with water.

 NOTES Turn to your notes section

 Observation: The bottle expanded when heated and contracted when cooled.  Conclusion: Air’s volume expands or contracts depending on temperature.  Application: a basketball left in a garage over winter.

 Observation: When the solid objects were added to the liquid, the original level of the liquid rose to a higher level.  Conclusion: The volume of the solid displaced the volume of the water.  Application: Too much ice in a drink.

 Observation: The flame goes out when the jar is placed over the candle.  Conclusion: Fire needs oxygen to burn.  Application: Fire blankets

 Observation: The rock seems to be made of more than one color. The shaving cream appears to be all one color and texture.  Conclusion: Neither of these objects are pure substances  Application: Is milk a pure substance?

 Observation: The sand did not dissolve. The purple crystal did dissolve.  Conclusion: The sand is insoluble in water. The crystal is soluble in water (it dissolved).  Application: Diluting wastewater.

 Observation: There are two layers of liquid in the container.  Conclusion: The two liquids are immiscible.  Application: Italian Salad Dressing

 Observation: The cup shaped pan floated and the folded pan did not float  Conclusion: Air helps objects to float. Increased surface area also helps objects to float.  Application: Rafts, life jackets. When floating in a pool, hold your breath and spread your arms and legs.

 Observation: The reaction produced gas and the temperature lowered.  Conclusion: Chemical Reactions can absorb or release heat. This reaction was endothermic.  Application: Alka Seltzer reduces acid/heat in stomach (indigestion).