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Concept Presentation: Writing and Balancing Reactions

Concept Presentation: Writing and Balancing Reactions. Presented by: Ann Hu. Opener. Song on: Don’t break the Law. Agenda. Background Information: Prior Knowledge & Overall place within the curriculum Comparison of Grade 10 vs. Grade 11 Lesson Sequence + Common Misconceptions

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Concept Presentation: Writing and Balancing Reactions

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  1. Concept Presentation: Writing and Balancing Reactions Presented by: Ann Hu

  2. Opener • Song on: Don’t break the Law

  3. Agenda • Background Information: Prior Knowledge & Overall place within the curriculum • Comparison of Grade 10 vs. Grade 11 • Lesson Sequence + Common Misconceptions • Accommodations • Application • Activities • Q & A

  4. Background Information • Prior Knowledge • Counting Atoms & Building Molecules (grade 9) • Connections of chemical reactions to the environment • Types of bonding • Chemical Naming and Formula • Lewis Dot Diagrams • Location within the course • In grade 10, toward the middle of the chemistry unit. • Chemical and Physical Changes • Types of Bonding & Naming • Writing and Balancing Equation • Types of Reaction • Properties of Acids and Bases • Neutralization • In grade 11, within unit 2.

  5. SNC2D vs. SCH3U • GRADE 10 (Academic) • C1. analyse a variety of safety and environmental issues associated with chemical reactions, including the ways in which chemical reactions can be applied to address environmental challenges • C1.1 analyse, on the basis of research, various safety and environmental issues associated with chemical reactions and their reactants and/or • product(s) • C1.2 analyse how an understanding of the properties of chemical substances and their reactions can be applied to solve environmental challenges • C2.4 use an inquiry process to investigate the law of conservation of mass in a chemical reaction • C3.2 explain, using the law of conservation of mass and atomic theory, the rationale for balancing chemical equations • C3.4 write word equations and balanced chemical equations for simple chemical reactions • GRADE 11 (University)-selected • D2. investigate quantitative relationships in chemical reactions, and solve related problems; • C2.2 write balanced chemical equations to represent synthesis, decomposition, single displacement, double displacement, and combustion reactions, using the IUPAC nomenclature system • D2.3 solve problems related to quantities in chemical reactions by performing calculations involving quantities in moles, number of particles, and atomic mass • D2.5 calculate the corresponding mass, or quantity in moles or molecules, for any given reactant or product in a balanced chemical equation as well as for any other reactant or product in the chemical reaction • 2D introduced in the form of simple equations whereas 3U introduced as part of the process. • 2D used it as extension of “the Law of Conservation of Mass”, and 3U used it as introduction to “Stoichiometry”

  6. Lesson Sequence • Lesson 1: Counting Atoms • Lesson 2: Lab-Law of Conservation of Mass • Lesson 3: Writing Equations • Lesson 4: Balancing Equations Day1+ • Lesson 5: Balancing Equations Day 2 • Lesson 6-7: Types of Reactions

  7. Lesson 1: Counting Atoms • Focus: Review the use of subscript and introduce the use of coefficient. • Plan • Warm Up: Use analogy to describe atoms vs. molecules, elements vs. compound • Dry Lab (molecular model kits) • Placemat Activity (Team Game Challenge) • Misconception #1: Students may place subscript as superscript or coefficient • Cause: Students may have connected the ideas of subscript with exponent • Suggestion: reinforce superscript is for charge whereas subscript is to indicate number Back Lesson menu

  8. Lesson 2: Lab-Law of Conservation of Mass • Focus: Through inquiry, students will be able to observe Law of Conservation of Mass. • Plan • Lab • Video: http://www.youtube.com/watch?v=QjVYz00-Kxc • Misconception #2: Gases has no mass, therefore don’t follow the Law of Conservation of Mass • Cause: Gases tend to escape into the atmosphere • Suggestion: reinforce the Law of Conservation of Mass include ALL particles Copper (II) Hydroxide solution Sodium sulphate solution Back Lesson menu

  9. Lesson 3: Writing Equations • Focus: How to write word equations. • Plan • Warm Up: A reaction produces products lighter than the reactants, explain. • Content • TPS: misconceptions • Group Activity • Misconceptions #3: Equal signs may be mistakenly used in place of the arrow in a chemical equation • Cause: relating math to science • Suggestion: reinforce products and reactants are completely different (e.g. H2 +O2H2O) • Common mistakes: ↑ can be used on both side of the reactions; ∆ and electricity on the reactant side Back Lesson menu

  10. Lesson 4: Balancing Equation Day 1 • Focus: Relating Law of Conservation of Mass to Balancing equations (simple) • Plan • Differentiated instruction for different learners. • Proportional Reasoning • Draw molecules • Bingo activity • Online resource H2+Cl2HCl changed to H2+Cl22HCl Lesson 5: Balancing Equation Day 2 • Focus: Relating Law of Conservation of Mass to Balancing equations (more complex) • Plan • Group Challenge • Online resource N2+H2NH3 & Na+H2ONaOH+H2 Back Lesson menu

  11. Misconceptions Within Balancing Equation • Misconceptions #4: Changing Subscripts in Chemical Formulas Plan • Cause: unable to count atoms, bonding, both sides equal • Suggestion: shows the effect of changing subscript; Reinforce the difference between coefficients vs. Subscript • Misconceptions #5: “Sum of coefficients before and after must be the same” & “Whatever the subscript is for an element on the reactant side of the equation, the same subscript must be used for that element on the product side” • Cause: the Law of Conservation of Mass • Suggestion: Bingo chips Back Lesson menu

  12. Misconceptions Within Balancing Equation • Misconceptions #6: Balancing Equations is strictly algorithmic exercise • Cause: no connection that the letter represents a “molecule”. • Suggestion: ask students to draw the molecules or use of words to explain their understanding Back Lesson menu McGoey, J., 2007

  13. Lesson 6/7: Types of Reaction • Focus: Continuation of the previous concepts • Plan • Include application of Balancing Reaction. Back Lesson menu

  14. Accommodations • Bingo activity can provide hands on activity. • Whiteboard ideas and group work helps with communication. • Encourage ELL students to translate the steps into their own language. • Accommodate ELL students in the evaluation by providing language easy test, and for Special Needs according to ILP.

  15. Application • Tied all concepts of chemical reaction together. • EUT: Grocery store Chemical Activities • 2 Stations. • Bingo Activity • Application of Activity • Write your result on the whiteboard (3-2-1)

  16. Questions? • Any Questions?

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