HS-PS1-4: Total Bond Energy Change in Chemical Reactions 

Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy. (Energy and Matter)

Clarification Statement: Emphasis is on the idea that a chemical reaction is a system that affects the energy change. Examples of models could include molecular-level drawings and diagrams of reactions, graphs showing the relative energies of reactants and products, and representations showing energy is conserved.

Assessment Boundary: Assessment does not include calculating the total bond energy changes during a chemical reaction from the bond energies of reactants and products.


The following assessments were created by science teachers hoping to better understand the NGSS. In most cases teachers went from standard to assessment in around an hour.  These are drafts and should be used accordingly. Feel free to improve these assessments or contribute to the collection. Learn more about assessment design here.



Anchor Charts



Chemical reaction system
 - Chemicals
 - Surroundings
Total bond energy
Potential energy
 - Bond energy of reactants
 - Bond energy of products
Kinetic energy
 - Surroundings by molecular collisions

Learning Plans

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