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Matter and Energy Reactions

An 8th-grade NYS-aligned science unit exploring cellular respiration, photosynthesis, and the Law of Conservation of Matter through chemical reaction formulas and atomic accounting.

JEJeffrey Elterman

Matter and Energy Reactions

An 8th-grade NYS-aligned science unit exploring cellular respiration, photosynthesis, and the Law of Conservation of Matter through chemical reaction formulas and atomic accounting.

JEJeffrey Elterman
(Salidas / Productos)

Scientific Conclusion Sentence Key:
"The total Carbon, Hydrogen, and Oxygen atoms are equal / conserved / the same (iguales / conservados) before and after the reaction. No atoms were created or destroyed / lost (creados o destruidos / perdidos)! They were only rearranged / reorganized (reorganizados / reorganizadas) into new molecules."

NYS Grade 8 Science Item Bank & Standards Alignment Guide Continue to Page 2 for Part 4 Rubric →

Scoring Rubric & Constructed Response

Part 4: Atom Accounting Key & Rubrics

Page 2 of 2

Grading Key & Standards

Completed Atom Accounting Table (6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂)

6 Pts (1 pt per cell)

ElementInputs (Reactants)Outputs (Products)Status
Carbon (C)6 (from 6CO₂)6 (from C₆H₁₂O₆)6 = 6 ✓
Hydrogen (H)12 (6 × 2 in 6H₂O)12 (from C₆H₁₂O₆)12 = 12 ✓
Oxygen (O)18 (12 in 6CO₂ + 6 in 6H₂O)18 (6 in C₆H₁₂O₆ + 12 in 6O₂)18 = 18 ✓

Question 10 Rubric: Conservation of Matter Explanation (2 Pts)

NYSSLS MS-PS1-5

2 Points (Full Credit) States that the number of atoms of each element (C, H, O) is exactly equal before and after the reaction, proving no atoms were created or destroyed, only rearranged into glucose and oxygen.

1 Point (Partial Credit) Mentions atoms are equal OR states matter cannot be destroyed, but fails to use quantitative atom evidence or omit the concept of rearrangement.

0 Points (No Credit) Incorrect claim that atoms disappeared, was converted to energy, or circular reasoning without scientific basis.

Exemplar Student Response: "The table shows there are 6 Carbon, 12 Hydrogen, and 18 Oxygen atoms in the reactants and the exact same amounts in the products. This proves the Law of Conservation of Matter because no atoms were created or destroyed; they were simply rearranged to form glucose and oxygen gas."

Question 11 Rubric: Reaction Synthesis (2 Pts)

NYSSLS MS-LS1-6 & MS-LS1-7

2 Points (Full Credit) Explicitly links the products of photosynthesis (glucose and oxygen) to the required reactants for cellular respiration, demonstrating matter cycling between autotrophs and heterotrophs/cells.

1 Point (Partial Credit) States that both reactions involve the same chemicals, but does not clearly show that the outputs of one are the direct inputs of the other.

0 Points (No Credit) States that plants only do photosynthesis and animals only do respiration, or irrelevant response.

Exemplar Student Response: "Plants make glucose (C₆H₁₂O₆) and oxygen (6O₂) during photosynthesis. These outputs become the exact inputs needed for cellular respiration, where organisms break them down to release energy, releasing carbon dioxide and water back into the cycle."

Common Grade 8 Misconceptions & Remediation Tips:

  • Misconception: Thinking oxygen count is just the subscript (e.g., counting 2 oxygen atoms in 6CO₂ instead of 12). Remediation: Explicitly teach distributing the coefficient across the entire molecule: 6 × CO₂ = 6C and 12O.
  • Misconception: Believing matter is destroyed because gas is invisible. Remediation: Emphasize that gases (CO₂, O₂) have mass and are composed of tangible atoms.

Total Exam Points: 19 Points • NYS Scaled Score Ready End of Teacher Guide

Study Resource: NYS Grade 8 Intermediate Science Standards Turn Over for Spanish Study Guide →

CIENCIAS DE 8.º GRADO DE NYS • GUÍA DE ESTUDIO ESTUDIANTIL

Hoja de Referencia: Bioenergética y Contabilidad de Átomos

Versión en Español

Dúplex: Inglés al reverso

1. Vocabulario Científico Esencial

NYSSLS MS-PS1-5 y MS-LS1-7

Entradas (Reactivos)

Sustancias iniciales situadas en el lado izquierdo de una ecuación química antes de reaccionar.

Salidas (Productos)

Sustancias nuevas formadas en el lado derecho tras completarse la reorganización atómica.

Respiración Celular

Proceso biológico celular que reacciona glucosa con oxígeno para liberar energía utilizable (ATP).

Fotosíntesis

Proceso en cloroplastos vegetales que absorbe energía solar para sintetizar glucosa y oxígeno.

Ley de Conservación de la Materia

La materia no se crea ni destruye; el número de átomos iniciales es igual al de los productos.

Símbolo Produce (→)

Flecha química dirigida a los productos; señala que ocurrió una transformación química real.

2. Decodificador de Fórmulas y Regla de Contabilidad

Coeficientes vs. Subíndices

C₆H₁₂O₆ Glucosa (Azúcar)

6 C, 12 H, 6 O

6O₂ Gas Oxígeno

6 × 2 = 12 O

6CO₂ Dióxido de Carbono

6 C, 12 O

6H₂O Agua

12 H, 6 O

La Regla de Multiplicación: Para contar átomos en un término químico como 6CO₂, multiplica el Coeficiente (número 6 grande al frente) por el Subíndice de cada elemento (número pequeño abajo). 6 moléculas × 1 Carbono = 6 Carbonos; 6 moléculas × 2 Oxígenos = 12 Oxígenos.

3. Comparación entre Fotosíntesis y Respiración Celular

Ciclo de la Materia en la Naturaleza

CaracterísticaFotosíntesisRespiración Celular
Ecuación Química6CO₂ + 6H₂O + Luz → C₆H₁₂O₆ + 6O₂C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energía
Entradas (Reactivos)Dióxido de carbono (6CO₂) y Agua (6H₂O)Glucosa (C₆H₁₂O₆) y Oxígeno (6O₂)
Salidas (Productos)Glucosa (C₆H₁₂O₆) y Oxígeno (6O₂)Dióxido de carbono (6CO₂) y Agua (6H₂O)
Flujo de EnergíaAbsorbe energía luminosa y la almacena en enlacesLibera la energía de enlaces químicos para la célula
Conexión Vital☆ Ciclo Completo de la Materia: ¡Las salidas de la fotosíntesis son las entradas directas de la respiración celular, y las salidas de la respiración celular son las entradas de la fotosíntesis!

Recurso de Estudio: Estándares de Ciencias Intermedias de 8.º Grado de NYS Fin de la Guía de Estudio • Versión en Español

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