Reflection: Lesson Planning Talk About Burning Your Money! (Phase Changes, Endothermic and Exothermic Reactions) - Section 4: Exothermic Reactions: Talk About Burning Your Money!


For every lesson, lab, or demonstration I do, I always plan for safety first.  Reflecting on my lessons (this demonstration in particular), I realize that simply watching the videos might make it easy to just focus on the excitement of the demonstration and figuring out where you can get the materials to do it in your own classroom.  Sometimes, even as adults, we skim over the warnings and safety precautions.  I have read too many stories of teachers whose demonstrations have gone wrong to take safety lightly.  

It is crucial that you practice the demonstration ahead of time and think ahead of all things that could go wrong.  I always think that a good rule of thumb is that you should never have your students do something you haven't already done yourself.  You can never go wrong with adding goggles or gloves to your procedures.  

In this particular lesson, I would urge you not to mix the rubbing alcohol and water at a concentration higher than 50% rubbing alcohol.  Goggles should always be worn and it is important that every portion of the dollar bill is submerged in the liquid.  Any portion of the bill that is not covered in the mixture will actually burn.  Last, make sure you have full size tongs, do not use tweezers!  I have even used my cooking tongs before because they are longer!  

  Safety, Don't Take it Lightly
  Lesson Planning: Safety, Don't Take it Lightly
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Talk About Burning Your Money! (Phase Changes, Endothermic and Exothermic Reactions)

Unit 4: Physical Properties: Molecular Arrangement and Phase Changes
Lesson 8 of 12

Objective: Students will be able to describe the changes in the motion of the particles, temperature, and state of matter of a substance when thermal energy is added or removed.

Big Idea: Students investigate endothermic and exothermic reactions with dry ice!

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dry ice lesson
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