Mississippi Science CHE.10.3
The Standard
- CHE.10
- Enrichment: Students will understand that energy is exchanged or transformed in all chemical reactions.
Enrichment: Analyze and interpret data from energy diagrams and investigations to support claims that the amount of energy released or absorbed during a chemical reaction depends on changes in total bond energy.
2026 Mississippi College- and Career-Readiness Standards for Science · Thermochemistry (Enrichment)
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare the energy needed to break reactant bonds with the energy released when product bonds form. They use bond-energy totals, energy diagrams, and temperature readings to decide whether a reaction releases or absorbs energy.
What Mastery Looks Like
- Students calculate net energy change by subtracting the energy released when bonds form from the energy needed to break bonds. They place products above or below reactants on an energy diagram and use the result to explain a measured temperature change.
Common Misconceptions
- Students may say breaking bonds releases energy because bonds contain energy. They may use the diagram’s peak, rather than the gap between reactants and products, to find the net energy change.
How to Assess It
- Exit ticket: Breaking bonds takes 600 kJ, and forming bonds releases 750 kJ. Find the net change, say whether energy is released or absorbed, and sketch the reactant and product energy levels.
Lesson moves
Ways to Teach It
Measure the temperature of 20 mL vinegar before and after adding 1 teaspoon baking soda, then sketch the reaction’s energy diagram.
Ask: If breaking bonds takes 650 kJ and forming bonds releases 800 kJ, where does the extra 150 kJ go?
Deal cards showing bond-breaking totals, bond-forming totals, and energy diagrams; students match sets and label each reaction as releasing or absorbing energy.
Open a disposable hand warmer, record its temperature change, and sketch an energy diagram for the iron oxidation that warms it.
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Printable CHE.10.3 Worksheet
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Related Standards
- PHY.3.6
Enrichment: Design, conduct, and communicate investigations that explore how temperature and thermal energy relate to molecular motion and states of matter.
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Enrichment: Analyze and interpret data to identify differences between strong and weak acids and bases (i.e., dissociation).
- CHE.10
Enrichment: Students will understand that energy is exchanged or transformed in all chemical reactions.
- CHE.10.2
Enrichment: Classify chemical reactions and phase changes as exothermic or endothermic based on enthalpy values. Use a graphical representation to illustrate th...
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