Endothermic and Exothermic Reactions System Vs Surrounding System

System Vs. Surrounding System – • A defined environment; a part of the universe

Endothermic Reaction Endothermic reactions – chemical reaction that absorbs energy to break existing bonds

Exothermic Reactions • Exothermic reactions – chemical reaction in which energy is released –

1. Your car burns gasoline as you drive from home to school. https: //www.

2. Jerry is baking homemade bread in the oven. https: //www. youtube. com/watch? v=Zi.

3. The ice melts in your glass of water. https: //www. youtube. com/watch? v=FYgi.

4. Sodium and chlorine combine in an explosive reaction to form table salt. https:

5. Barry lights his candles to get his hot air balloon to fly. https:

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Endothermic and Exothermic Reactions

System Vs. Surrounding System – • A defined environment; a part of the universe on which you focus your attention Surroundings – • Everything else. We focus on the region in the immediate vicinity of the system

Endothermic Reaction Endothermic reactions – chemical reaction that absorbs energy to break existing bonds – Energy goes into the reaction (system) from the surroundings – Temperature of endothermic reactions goes down • Ex: Boiling Water or Melting Ice (absorbing energy; increases movement of molecules)

Exothermic Reactions • Exothermic reactions – chemical reaction in which energy is released – Energy goes out of the reaction (system) into the surroundings – Temperature of exothermic reactions goes up – EX: Condensation (gas to liquid) releasing energy; molecules slow down.

1. Your car burns gasoline as you drive from home to school. https: //www. youtube. com/watch? v=31 mt. Od. HG b. B 4 (View video at 5: 20)

2. Jerry is baking homemade bread in the oven. https: //www. youtube. com/watch? v=Zi. UJk 12 Yn N 8 (View video at 3: 00)

3. The ice melts in your glass of water. https: //www. youtube. com/watch? v=FYgi. Z 7 Kzg Dk View whole video

4. Sodium and chlorine combine in an explosive reaction to form table salt. https: //www. youtube. com/watch? v=ji_25 I_q 4 L Q (start video at 4: 19 then forward it to 5: 40) Sodium Table Salt Chlorine Reaction

5. Barry lights his candles to get his hot air balloon to fly. https: //www. youtube. com/watch? v=HTim. Rt. Am SMs (start at 6: 33 then forward to 7: 32)