Warm up How many grams are in 2.5 x atoms of Argon? 2.How many atoms are in 200 grams of CO 2 ? Agenda -Go over quiz unit 5 -Extra Credit #3 -Notes unit 5-6 -Practice Mole Ratio Problems Homework Dec 5 – Chem. Saturday School Dec 9 - Deadline to retake quizzes Dec 11 – Test unit 5 Dec 15 - Extra credit due

Quiz Answer Unit 5 Version Yellow 1) Change in color, odor, temperature, gas etc… 2) 2Al + Fe 2 O 3 -> 2Fe + Al 2 O 3 3) Decomposition 4) 180 grams 5) 6.02 x atoms 6) 94 g/mol Version Blue 1) Change in color, odor, temperature, gas etc… 2) 2NaCl + MgBr 2 → MgCl 2 + 2NaBr 3) Synthesis or combination 4) 160 grams 5) 6.02 x atoms 6) 94 g/mol

Extra Credit How Much: 1% of your overall grade Due Date: December 14 odd periods December 15 even periods Task: -Create multiple choice test questions using the book or class notes (4 choices per question) -5 questions per unit (total of 25 questions) -Highlight the correct answer for each question -Must be hand written No credit if: -Copy questions from the book or warm up -Copy questions from the internet -No answer key -Answer choices are irrelevant to the chapter topic

Notes Unit 5-6 Mole Ratio

Mole Ratio Dealing with quantities of different substances in chemical reactions. New concepts to solve stoichiometry problems: 1.Mole ratio 2.Picket fence method

Mole Ratio List the require ingredients to make s’mores

Mole Ratio If the recipe to making s’mores is 2 crackers + 1 chocolate + 1 marshmallow -> 1 s’more How many s’mores can you make with 26 crackers and unlimited amount of chocolate and marshmallow? Mole ratio comes from the coefficient in your balanced equation ReactantsProduct

Mole Ratio The ratio is usually for comparison between the amount on the reactant side vs. the product side in a reaction 2 crackers + 1 chocolate + 1 marshmallow -> 1 s’more ReactantsProduct

Mole Ratio Problems N 2 + 3H 2 -> 2NH 3 1. How many moles of H 2 are needed to make 4 moles of NH 3 ? 2. How many moles of NH 3 are needed to make 312 moles of H 2 ? 3. How many moles of NH 3 are produced if you had 230 moles of N 2 and unlimited amount of H 2 ? Step 1: Balance the equation Step 2: Find mole ratio

Mole Ratio Practice Problems 1) How many moles of SO 2 is required when combining with 23 moles of O 2 ? _SO 2 + _O 2 ---> _SO 3 2) How many moles of H 2 O are produced when 7 moles of oxygen gas are used? _H 2 + _O 2 ---> _H 2 O 3) If 4 moles of H 2 O are produced, how many moles of oxygen gas must be consumed? _H 2 + _O 2 ---> _H 2 O 4) How many moles of oxygen gas are produced from the decomposition of 8 moles of KClO 3 ? _KClO 3 --> _KCl + _O 2 5) Write the molar ratios for N 2 to H 2 and NH 3 to H 2 for this reaction_N 2 + _H 2 ---> _NH 3

Answers 1. 2SO 2 + O 2 ---> 2SO 3 46 mol SO H 2 + O 2 ---> 2 H 2 O14 mol H 2 O 3. 2 H 2 + O 2 ---> 2 H 2 O2 mol O KClO 3 --> 2KCl + 3O 2 12 mol O 2 5. N 2 + 3H 2 ---> 2NH 3 1 N 2 : 3H 2 & 2 NH 3 : 3 H 2