Chemical Reactions: Matter and Energy in Reactions

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Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the final of four Science Objects in the Chemical Reactions SciPack. It explains how different configurations of atoms and molecules are associated with different energy levels. Some changes of configuration among atoms and molecules require a net input of energy whereas others cause a net release. As a result, chemical reactions may release or consume energy. Some reactions such as the burning of fossil fuels release large amounts of energy by losing heat and by emitting light. Energy from light and other electromagnetic radiation can initiate many chemical reactions such as photosynthesis and the evolution of urban smog. The behavior of atoms in chemical reactions demonstrates the conservation of matter: When the number of atoms in a closed system stays the same, their total mass remains constant no matter how they are rearranged.

Grades
  • Elementary
  • Middle

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Reviews (8)
  • on Sat Feb 28, 2015 2:35 PM

The graphs were extremely helpful in understanding the materials and taking the assessments.

Robin Willig  (Rye Brook, NY)
Robin Willig (Rye Brook, NY)

  • on Tue Sep 02, 2014 5:21 AM

I really enjoy Science Objects. In 1-3 hours, the Chemical Reactions: Matter and Energy in Reactions Science Object will help me re-learn, refresh, or learn for the first time some critical science concepts I will have to know to obtain my Science Educator credentials. I appreciate that I can complete them at my own pace, and that, if used as park of a SciPack, I have access to a content expert to go to for help. The NSTA Learning Center Science Objects are really beneficial!

Naomi Beverly  (Marietta, GA)
Naomi Beverly (Marietta, GA)

  • on Wed May 01, 2013 10:24 AM

this article has some really great chemical reactions and example of safe explosions that I think students would love to see in the classroom

Morgan Burks  (warrensburg, MO)
Morgan Burks (warrensburg, MO)

  • on Wed Feb 29, 2012 11:22 PM

A very organized and exceptional presentation of the foundation of physical science. Matter and Energy were never these interesting.

Ronaldo Relador  (Bowie, MD)
Ronaldo Relador (Bowie, MD)

  • on Wed Feb 29, 2012 11:22 PM

A very organized and exceptional presentation of the foundation of physical science. Matter and Energy were never these interesting.

Ronaldo Relador  (Bowie, MD)
Ronaldo Relador (Bowie, MD)

  • on Sun Nov 13, 2011 10:25 AM

This Science Object would provide a great introduction to the explosive chemical reactions that can take place between reactants. Most of my older students constantly express a desire to see explosions; teachers can safely use this desire to explain the importance of all reactions (endothermic as well as exothermic). This Science Object gives teachers a great instructional tool and clear insights into how matter, energy and chemical reactions are interrelated. I found this Science Object to be the least difficult to comprehend of all the science objects in this Chemical Reactions SciPack!

Duane Little  (Washington, DC)
Duane Little (Washington, DC)

  • on Sat Mar 19, 2011 7:10 PM

This was an exeptional interactive inquiry. I believe it can be used in HIgn School for 9th grade Physical Science, and for 11th Grade basic Chemistry. The interactive graphs were colorful, easy to use, and expalined well. I especially liked the section that used Fe + CuCl2 yields FeCl2+Cu. NOt only can this formula be use throughout the lab activity (virtual Lab activity) it also shows one of the ways one can smelt Copper, which I do not think was mentioned. This is a great lab.

Chester Orban  (Litchfield, NH)
Chester Orban (Litchfield, NH)

  • on Sun Sep 12, 2010 8:55 PM

As a teacher who was has been out of the classroom for 2 years, this was a great way to review and improve my content knowledge. The video clips and interactive simulations were very helpful!

Anthonette  (Washington, DC)
Anthonette (Washington, DC)


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