Presentation on theme: "/11 Multistep Conversions Make 20 cookies!"— Presentation transcript:
1 10 9 8 7 6 5 4 3 2 1 3/11 Multistep Conversions Make 20 cookies! 1. Analyze the cookie recipe. If a baker wanted to make 40 cookies how much of the following would they need: eggs? cups of flour?2. CALCULATE how many minutes are in 1 year by using a “string of conversion” factors. Show all work.1 year= ? min
2 Stoi - chi - om - me - try Stoy- key- ahm- meh- tree Introduction to StoichiometrymassbalancedThe Law of Conservation of ________ and a _______________ equation allows us to calculate how much of substance reacts or is produced in a chemical reaction. These types of calculations are called _____________________ and use _______________ factors to solve for an unknown mass or # of moles. Balance the equation below so we can practice some stoichiometry:stoichiometryconversionStoi -chi -om -me -tryStoy-key-ahm-meh-tree
3 H2 + O2 H2O Introduction to Stoichiometry mass balanced The Law of Conservation of ________ and a _______________ equation allows us to calculate how much of substance reacts or is produced in a chemical reaction. These types of calculations are called _____________________ and use _______________ factors to solve for an unknown mass or # of moles. Balance the equation below so we can practice some stoichiometry:stoichiometryconversionH O2 H2O
6 2H2 + 1O2 2H2O The coefficients are molar ratios! Formation of Water2H2 + 1O2 2H2O2 molecules of H molecules of O2 2 molecules of H2O2 x H x O2 2 x H2O(6.022 x 1023)(6.022 x 1023)(6.022 x 1023)molemolemole2 x H x O2 2 x H2OThe coefficients are molar ratios!The balanced equation is like a recipe!
7 2H2 + 1O2 2H2O 10.0 How much Oxygen is Required If a chemist has ______ g of H2, how many g of O2 would be required for the reaction?GIVENINFORMATION____ H2 ____ H2____ H2 ____ O2____ O2 ____ O2WHAT I WANT TO KNOWgmolmolmolmolg10.0 g H21mol H21mol O232.00g O2= 79.2 g O2mol O22.02g H22mol H21
8 Mass Mole Conversions g molmol molmol g10.079.2SO, WE KNOW THAT FOR ______ g H2 TO FULLY REACT, ______ g O2 IS NEEDED.
10 _2_ NaOH + _1_ H2SO4 _2_ H2O + _1_ Na2SO4 109876543213/6 Stoichiometry Error_2_ NaOH + _1_ H2SO4 _2_ H2O + _1_ Na2SO4A student sets up the stoichiometry calculation below to find out how much water is made if you start with 200 g of NaOH.1. WRITE what 3 things they did wrong in their calculation.200 g NaOH1 mol NaOH3 mol H2O1 mol H2O= g H2O200 g NaOH2 mol NaOH18.02 g H2O
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