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Types of Reaction and Predicting Reactions

Types of Reaction and Predicting Reactions. Concept Presentation Winnie Ho HS Science Instructors Janine Extavour & Marty Zatzman. Goal of this presentation. Grade 10 teachers: - Differences between Gr 10 and 11 and how to prepare our students Grade 11 teachers:

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Types of Reaction and Predicting Reactions

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  1. Types of Reaction and Predicting Reactions Concept Presentation Winnie Ho HS Science Instructors Janine Extavour & Marty Zatzman

  2. Goal of this presentation Grade 10 teachers: - Differences between Gr 10 and 11 and how to prepare our students Grade 11 teachers: • What Gr 10 students know and common roadblocks in this topic

  3. Teaching sequence in 11U • Unit 1- Matter, Chemical trends, and Chemical Bonding • Unit 2 - Chemical reaction Prior knowledge: - Ionic compounds and covalent molecules - Nomenclature - Balancing equation - Classifying reactions

  4. Curriculum expectation Grade 10 – Chemistry expectations on types of reaction Grade 11 – Chemical reaction (selected expectations on types of reaction)

  5. Grade 10 - Classifying all four reaction types + Neutralization Grade 11 All four reaction types + Activity series + Solubility rules + Neutralization + Combustion + Nuclear reactions Focus on lab inquiry Prediction of products Comparison

  6. Diagnostic assessment • nitric acid + potassium hydroxide  ____________+ water Type: ___________ • zinc + ___________  zinc nitrate solution + copper Type: ___________ • __________ acid + zinc carbonate  zinc sulfate + water + carbon dioxide Type: ___________ • calcium + chlorine  _____________________ Type: ___________ • magnesium + hydrochloric acid  __________ + hydrogen Type: ___________ • propane + oxygen  _____________________ + water Type: ___________

  7. +  +  + +  + +  +  + Sodium and Chlorine reacts to form Sodium chloride

  8. Roadblock #1 Failure to connect symbols to the actual elements A + BAB A can represent an element, a diatomic molecule, or a compound. The ordering of the symbols is important.

  9. Can you find the mistakes?

  10. Macroscopic Microscopic Symbolic

  11. Roadblock #2 Predicting synthesis vs. combustion rxn Grade 10 – synthesis reaction • Grade 11 –combustion reaction • Reaction of a substance with oxygen, producing oxides and energy (Nelson text) • Combustion of magnesium as an example of a synthesis reaction • Exothermic reaction

  12. Synthesis Reaction! Brad + Angelina Brangelina

  13. Tom + Katie TomKat

  14. Roadblock #3 Predicting single displacement reactions Zn(s) + CuSO4(aq)--> ZnSO4(aq) + Cu(s)

  15. Video Safety concerns: Demo: Li, Na, K with water Goggles, small quantity

  16. Alternatives M + BC  MC + B M= metal element N + BC  BN + C N= non-metal element

  17. Roadblock #4 Predicting double displacement reactions If a reaction does not produce a precipitate, a gas, or water, then it is not a DD reaction.

  18. Solubility table KOH(aq) + NH4Cl (aq)--> No Reaction

  19. KOH(aq) + NH4Cl (aq)--> no reaction

  20. Use of states symbols are important • More consistent usage of state symbols in grade 10 when writing out chemical equations. e.g., NaOH(aq) + HCl(aq)  H2O (l) + NaCl (aq)

  21. Societal implications

  22. Computer resources • Gizmos • Metals in aqueous solutions simulation Differentiated instruction • Computer simulation (modified versions of activities) • Video • Group work on making connections issues

  23. Thank you.

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