February 08, 2013 AGENDA: 1 – Bell Ringer/Agenda Today’s Goal: Students will be able to balance chemical reactions. Homework Complete More Balancing Classwork– due Monday ALL Week 21 late work – due today for partial credit Empty/Organize Binder for Binder check Monday REVIEW for QUIZ! AGENDA: 1 – Bell Ringer/Agenda 2 – Review for Quiz and Binder check Monday 3 – Review Classwork – Balancing 4 – Classwork Time

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Friday, February 08 Objective: Students will be able to balance chemical reactions. Bell Ringer: Balance the following chemical equation: ___CH4 + ___O2  ___CO2 + ___H2O C = C = H = H = CO2: O = H2O: O = Total: O = Total: O =

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Friday, February 08 Objective: Students will be able to balance chemical reactions. Bell Ringer: Balance the following chemical equation: ___CH4 + ___O2  ___CO2 + ___H2O C = C = H = H = CO2: O = H2O: O = Total: O = Total: O =

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Friday, February 08 Objective: Students will be able to balance chemical reactions. Bell Ringer: Balance the following chemical equation: ___CH4 + ___O2  ___CO2 + ___H2O C = C = H = H = CO2: O = H2O: O = Total: O = Total: O =

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Friday, February 08 Objective: Students will be able to balance chemical reactions. Bell Ringer: Balance the following chemical equation: ___CH4 + ___O2  ___CO2 + ___H2O C = C = H = H = CO2: O = H2O: O = Total: O = Total: O =

BELL-RINGER TIME IS UP!

February 08, 2013 AGENDA: 1 – Bell Ringer/Agenda Today’s Goal: Students will be able to balance chemical reactions. Homework Complete More Balancing Classwork– due Monday ALL Week 21 late work – due today for partial credit Empty/Organize Binder for Binder check Monday REVIEW for QUIZ! AGENDA: 1 – Bell Ringer/Agenda 2 – Review for Quiz and Binder check Monday 3 – Review Classwork – Balancing 4 – Classwork Time

Friday, February 08 Objective: Students will be able to balance chemical reactions. Bell Ringer: Balance the following chemical equation: ___CH4 + ___O2  ___CO2 + ___H2O C = 1 C = 1 H = 4 H = 2 CO2: O = 2 H2O: O = 1 Total: O = 2 Total: O = 3

Friday, February 08 1 2 1 2 Objective: Students will be able to balance chemical reactions. Bell Ringer: Balance the following chemical equation: ___CH4 + ___O2  ___CO2 + ___H2O C = 1 x 1 = 1 C = 1 x 1 = 1 H = 4 x 1 = 4 H = 2 x 2 = 4 CO2: O = 2 x 1 = 1 H2O: O = 1 x 2 = 2 Total: O = 2 x 2 = 4 Total: O = 3  4 1 2 1 2

Quiz Monday – 30 pts Objective 1 – 5 pts – Students will be able to create formulas and name ionic and covalent compounds. Objective 2 – 15 pts – Students will be able to identify chemical reactions (3 indicators) and convert chemical and word equations. Objective 3 – 10 pts – Students will be able to balance chemical equations.

Binder Check Monday – 40 pts All 8 dividers properly labeled = 15 pts Unit Cover Sheets Bell Ringers Notes – 3 sets of notes (one hand out, 2 in notebook) 15 pts Classwork – 2 classwork assignments – 10 pts Homework Labs Quizzes Tests

Why do we balance chemical equations? Cornell Notes Topic: Balancing Chemical Reactions Date: 2/07/2013 MgO  Mg + O2 Reactants  Products Why do we balance chemical equations? Things reacting Things produced

Cornell Notes (continued) Law of Conservation of Mass/Matter = = Mass of reactants Mass of products # of each element of the reactants # of each element of the products

Cornell Notes (continued) Reactants ___ MgO Mg = 1 O = 1 Products ___ Mg + ___ O2 Mg = 1 O = 2 Example: 2 2 1 Coefficients x 2 = 2 x 2 = 2 x 2 = 2 x 1 = 2 Balanced Chem. Eqn. = 2 MgO  2 Mg + 1 O2 = Mg = O  +

Cornell Notes (continued) “How to Balance” Steps: Draw a line between reactants & products. Count up all atoms of reactants & products. Determine multiplier (coefficient)  LCD. Place multiplier (coefficient) in front of compound, and multiply in your total. Save balancing the H and O until LAST! (hint: I prefer to save O until the very last) Double-Check to make sure it is balanced!

Practice (on LEFT page) Counting Atoms: O2 O = 2 Fe2O3 Fe = 2 O = 3 2 NaOH Na = 2 O = 2 H = 2 2 Ca(NO3)2 Ca = 2 N = 4 O = 12

Practice (continued) Reactants ___ Ag + ___CuCl2 Ag = 1 Cu = 1 Cl = 2 Products ___ Cu + ___ AgCl Ag = 1 Cu = 1 Cl = 1 Example: 2 1 1 2 x 2 = 2 x 2 = 2 x 1 = 1 x 1 = 1 x 1 = 2 x 2 = 2

Never Never change a subscript to balance an equation (You can only change coefficients) H2O is a different compound than H2O2 If you change the subscript (formula) you are describing a different chemical. Never put a coefficient in the middle of a formula; they must go only in the front 2NaCl is okay, but Na2Cl is not.

Practice (continued) 2 4 3 Reactants ___ Al2O3 Al = 2 O = 3 Products ___ Al + ___ O2 Al = 1 O = 2 Example: 2 4 3 x 2 = 4 x 4 = 4 x 2 = 6 x 3 = 6

Practice Balancing Examples _AgNO3 + _Cu ® _Cu(NO3)2 + _Ag _Mg + _N2 ® _Mg3N2 _P + _O2 ® _P4O10 _Na + _H2O ® _H2 + _NaOH _CH4 + _O2 ® _CO2 + _H2O 2 2 3 4 5 2 2 2 2 2