Mississippi Science P.7.5D.4
The Standard
- P.7.5D
- Students will demonstrate an understanding of chemical formulas and common chemical substances to predict the types of reactions and possible outcomes of the reactions.
Build a model to explain that chemical reactions can store (formation of bonds) or release energy (breaking of bonds).
2026 Mississippi College- and Career-Readiness Standards for Science · Organization of Matter and Chemical Interactions
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students build a model showing atoms rearranging as old bonds break and new bonds form. They use energy arrows to show that breaking bonds takes energy and forming bonds releases it.
What Mastery Looks Like
- A student labels both energy changes on a reaction model. They compare the amounts to explain why the surroundings warm or cool.
Common Misconceptions
- Students may think breaking bonds releases energy or that forming bonds always stores it. Some think a reaction that feels cold has no energy change.
How to Assess It
- Exit ticket: Breaking old bonds takes 8 energy units; forming new bonds releases 12. Draw energy arrows and say whether the surroundings warm or cool.
Lesson moves
Ways to Teach It
Use four labeled magnets as atoms; separate paired magnets, reconnect different pairs, and draw arrows for energy needed and energy released.
Ask, “If a reaction makes a cup feel cold, where did the energy for breaking old bonds come from?” Have students write two sentences.
Give pairs reaction cards with energy amounts for breaking and forming bonds; have them sort the cards into warming and cooling piles.
Show an iron hand warmer packet; have students sketch iron reacting with oxygen and draw a heat arrow toward a cold hand.
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