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Unit: Chemical Reactions

This unit covers diatomic elements and how to write formula equations from word equations in chemical reactions. Learn to name diatomic elements and convert word equations to balanced formula equations. Understand common forms of chemical reactions and balance charges. Practice examples to solidify your understanding. Follow the flow chart to accurately convert word equations into formula equations. Keep all substances and plus signs aligned. Work on an exit ticket and then move on to Worksheet 1 for homework.

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Unit: Chemical Reactions

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  1. Day 1 - Notes Unit: Chemical Reactions Diatomic elements, Writing formula equations from word equations

  2. After today you will be able to… • Name the diatomic elements • Write formula equations given the word equation for a chemical reaction heat Pt

  3. A chemical equation represents a chemical reaction. ReactantsProducts “Yield” • Reactants and products are separated from each other with a plus (+)sign.

  4. Common forms of chemical reactions… A + B  C A  B + C A + B  C + D

  5. Chemical equations can be written as word equations or formula equations. Formula equations can be balanced or unbalanced.

  6. Word Equation: Iron + Oxygen  Iron (III) Oxide Formula Equation: 4Fe(s) + 3O2(g)  2Fe2O3(s) Balanced!

  7. Symbols in Chemical Equations heat Pt

  8. To change word equations into formula equations follow the flow chart…

  9. Just write the symbol Example: “Sodium”=Na • Br2 I2 N2 Cl2 H2 O2 F2 • Have the subscript “2” Examples: “Bromine”=Br2 “Hydrogen” = H2

  10. (nM +nM) (M +nM) • Prefixes for subscripts Examples: “dinitrogen tetraoxide” • Balance charges!!! Example: “calcium chloride” Ca+2 Cl-1 Cl-1 N2O4 CaCl2

  11. Let’s try some examples! 

  12. Na+1 Cl-1 Na+1 F-1 + F2  NaF + Cl2 NaCl Examples: Convert into formula equations… 1. sodium chloride + fluorine  sodium fluoride + chlorine 2. aluminum + sulfur  aluminum sulfide Helpful tip: Keep all substances and + signs in line with each other! Al+3 S-2 + S  Al Al2S3

  13. Zn+2 S-2 Mg+2 (AsO4)-3 Mg+2 S-2 Zn+2 (AsO4)-3 3. zinc + magnesium  zinc + magnesium sulfide arsenate arsenate sulfide + Mg3(AsO4)2 Zn3(AsO4)2 +  MgS ZnS

  14. Do now: Complete “Exit Ticket” Then: Begin WS 1 (Homework)

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