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STEP 12: STOICHIOMETRY PART 1Chemical equations and molar masses are useful to know when trying to figure out the amount of materials you need toproduce something. We will use stoichiometry, which is the study of the relationship between materials in a chemicalequation, to help us figure out the amounts of materials we need or the amount we will receive in a chemical reaction.For example, below is a chemical reaction or recipe that I use to make sandwiches2 breads + 1 cheese + 1 tomato + 3 pickles ---> 1 sandwichUSE DIMENSIONAL ANALYSIS TO ANSWER THESE QUESTIONS1.) If I want to make 1 sandwich, how many pickles do I need? _________________Conversion unit:Solve:2.) If I want to make 3 sandwiches, how many pieces of bread do I need? ____________Conversion unit:Solve:3.) If I have 3 tomatoes, how many sandwiches can I make? ____________Conversion unit:Solve:4.) If I have 9 pieces of bread, how many sandwiches can I make? ____________Conversion unit:Solve:44
Example #1: Now, try with a real chemical reaction.EX: Hydrogen reacts with oxygen to give us water.____H 2 (g) + ____O 2 (g) ------> ____H 2 O(l)1.) First, ALWAYS make sure the equation is balanced. If it isn’t, please balance it. (Otherwise, the rest of your answerswill be incorrect.2.) In this reaction, if I have 1 molecule of O 2 , how many molecules of H 2 do I have? _________How many molecules of water (H 2 O) do I have? _____________3.) In this reaction, if I have 2 moles of H 2 , how many moles of O 2 do I have? __________How many moles of water (H 2 O) do I have? __________4.) If I want to make 6 moles of H 2 O, how many moles of H 2 do I need? __________How many moles of O 2 do I need? ____________5.) Oftentimes in a lab setting, you will have to convert from moles to grams because the only way to measure outmoles is to weigh them with a balance. Using the chemical equation or recipe, I want you to convert the moles intograms.H 2 :O 2 :H 2 O:6.) If I want to form 200 grams of H 2 O, how many moles of H 2 do I need? How many grams of H 2 is that?7.) If I want to form 200 grams of H 2 O, how many moles of O 2 do I need? How many grams of O 2 is that?45
Page 3 and 4: Chemical Changes on a Molecular Lev
Page 7 and 8: Mostly Cloudy Mini-Lab1.) Put on go
Page 9 and 10: STEP 3: EVIDENCE FOR CHEMICAL REACT
Page 11 and 12: *****AS PART OF YOUR HOMEWORK, PLEA
Page 13 and 14: 15.) The diagram below represents a
Page 15 and 16: Structure of an EquationAll chemica
Page 17 and 18: 4.) Fill out the following table ba
Page 19 and 20: Balancing Chemical EquationsBecause
Page 21 and 22: HomeworkFor each problem, balance t
Page 23 and 24: STEP 6: DIMENSIONAL ANALYSIS PART 1
Page 25 and 26: EX #4: How many seconds are in a ye
Page 27 and 28: 1.) How many nickels are in 10 dime
Page 29 and 30: STEP 7: DIMENSIONAL ANALYSIS PART 2
Page 31 and 32: STEP 8: MOLES & PARTICLESReview: Ba
Page 34 and 35: STEP 9: MOLES & GRAMSReview:1.) How
Page 36: HOMEWORKMolar MassDo the following
Page 39 and 40: 3.) At STP, what volume does 0.355
Page 41 and 42: Mole-Volume Conversions1. Determine
Page 43: 5. How many particles are there in
Page 47 and 48: STEP 13: STOICHIOMETRY PART 21.) Ba
Page 49 and 50: 7. The Haber reaction produces ammo
Page 51 and 52: Name: Date: Period:Stoichiometry is
Page 53 and 54: Using stoichiometry, how many moles
Page 55 and 56: 4. What was the mass of the empty 5
Page 57: Name: Date: Period:An essential par

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