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C.8.D: The student is expected to use the Law of Conservation of Mass to write and balance chemical equations.

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This guided inquiry lesson enables students to construct their own understanding of how to count atoms and balance chemical equations. Students are able to actively learn the material without lecture or note taking.

Note: This section of the lesson contains components from the free lesson

• Students use illustrations of chemical compounds to determine the function of subscripts in chemical formulas.

• Students compare formulas with and without coefficients. They use this information to determine the how the presence of a coefficient affects the number of each type of atom in a compound.

• Students compare illustrations of unbalanced and balanced reactions. They are asked to count the number of each type of atom unbalanced and balanced reactions. Using this information, they determine the main difference between unbalanced and balanced reactions.

• Students infer that having the same number of atoms on both sides of the equation will result in the mass of the reactants being equal to the mass of the products. The Law of Conservation of Mass is introduced.

• Students return to the illustrations of unbalanced and balanced reactions in order to determine the function of coefficients in chemical equations.

• Students identify equations as balanced or unbalanced based on the number of each type of atom.

• Students practice balancing chemical equations that require the addition of one coefficient.

• Students practice balancing chemical equations that require the addition of two coefficients.

• Students practice balancing chemical equations that require the addition of three coefficients.

• Students practice balancing chemical equations and check their answers by assembling a “triangle puzzle”.

Students practice balancing chemical equations by working through a set of task cards.

Students are provided with a student study sheet summarizing all of the important concepts and vocabulary in this lesson.

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• Remembering: Define the following terms: chemical bond, subscript, reactant, product, balanced reaction, unbalanced reaction, Law of Conservation of Mass, coefficient.

• Understanding: Explain how subscripts and coefficients are used in chemical formulas and reactions.

• Applying: Use subscripts and coefficients to determine the number of each atom present in a compound.

• Analyzing: Distinguish between balanced and unbalanced chemical equations.

• Evaluating: Use coefficients to balance chemical equations.

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• Cover page (1 page)

• Guided inquiry lesson (16 pages)

• Handouts (3 pages)

• Student study sheets (2 pages)

• Teacher notes (2 pages)

• Guided inquiry lesson with suggested answers (15 pages)

• Task Cards (12 pages)

• Task Card Answers (1 page)

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• Please go to your

• Look for the

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Kendo's Chemistry Store

Total Pages

52 pages

Answer Key

Included

Teaching Duration

1 hour

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