Chemical Reactions: Categorizing Chemical 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 second of four Science Objects in the Chemical Reactions SciPack. It provides an understanding of the idea that a large number of important reactions involve the transfer of either electrons (oxidation/reduction reactions) or hydrogen ions (acid/base reactions) between reacting ions, molecules, or atoms. In other reactions, chemical bonds are broken by heat or light to form very reactive radicals with electrons ready to form new bonds. Reactions involving these radicals control many processes such as the presence of ozone and greenhouse gases in the atmosphere, burning and processing of fossil fuels, the formation of polymers, and explosions.

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Reviews (10)
  • on Sat Feb 28, 2015 11:47 AM

This science object helps organize your understanding of the different type of chemical reactions to better learn and teach the topic.

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

  • on Sat Oct 18, 2014 1:24 AM

Great resource!

Carina Hernandez
Carina Hernandez

  • on Tue Sep 02, 2014 5:20 AM

I really enjoy Science Objects. In 1-3 hours, the Chemical Reactions: Categorizing Chemical 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 Feb 29, 2012 11:19 PM

I have never seen this comprehensive account on the various chemical reactions. This presents the truth in a very graphic and organized way.

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

  • on Tue May 17, 2011 7:54 PM

I would use this material as an e-book for students who missed class discussions and activities on re-dox, acid-base, and displacement reactions. This is an excellent resource by itself but more so as an auxiliary e-text for students who need more review or for those who like a bit of a challenge. The material is clearly organized and sequentially leads the learner through the reactions, building the case for electron transfer, balancing equations, and bond formations. The charts offered as mnemonics mirror those found in written text books but stand as corollaries to more interactive learning. Students may use the tables and other aids to build their responses to the ‘test your knowledge’ questions. Safe and simple activities are described to allow investigations in the home and the discussion of free radicals brings the theory into a more concrete situation applicable to the nature of ozone and the ozone hole and why we should care.

Patricia  (Arlington, VA)
Patricia (Arlington, VA)

  • on Sun Mar 06, 2011 6:08 AM

Over all experience is excellent. When filling the gap using words alternate correct answers need to be accepted. Page 3 of 8: Vinegar and Baking Soda eaxmple does not respond correctly if it is written as acetic acid and bicarbonate. Again in page 3 of 8: Lemon juice is an organic acid, so there is supposed to be some un-dissociated acid molecules. Hence when water is added those un-dissociated acid molecules are supposed to get dissociated. This will increase the number of H+ ions in the solution. Hence addition of water increases the H+ ion concentration for an organic acid(lemon juice). Diluting further will change the situation.

Pinaki Chowdhury
Pinaki Chowdhury

  • on Wed Nov 03, 2010 9:40 AM

This SciPack series is a first stop for anyone who wants a review of basic chemistry content before teaching about chemical reactions. The tutorial is very user-friendly, engaging and allows you to progress at your own pace.

Lara  (New Haven, CT)
Lara (New Haven, CT)

  • on Wed Nov 03, 2010 9:30 AM

This SciPack series is a first stop for anyone who wants a review of basic chemistry content before teaching about chemical reactions. The tutorial is very user-friendly, engaging and allows you to progress at your own pace.

Lara  (New Haven, CT)
Lara (New Haven, CT)

  • on Wed Sep 17, 2014 7:40 PM

This is a great source of information!

Christina Torango
Christina Torango

  • on Tue Nov 01, 2011 11:46 PM

This Science Object was by far the most difficult and confusing material I have encountered! I couldn't even formulate questions to Ask the Mentor; pretty radical wouldn't you say? If there is anyone who can provide greater insight into the mysteries of oxidation states, dissociation and proton/electron transfers you are worth your weight in gold.

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


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