# Kinetics and Stoichiometry

 The study of reaction speeds is called
 Kinetics
 A catalyst speeds up a chemical reaction by
 lowering the activation energy of the reaction.
 If product molecules have a lower energy than reactant molecules, the reaction is (exothermic / endothermic)
 exothermic
 The energy of a molecule is stored in its
 bonds
 Powdered magnesium will react faster than a strip of magnesium ribbon because
 The powdered magnesium exposes more surface area during the reaction.
 A chemical reaction can be slowed down by (increasing / decreasing) temperature.
 decreasing
 A chemical that speeds up a chemical reaction is called a
 catalyst
 A biological catalyst is called a(n)
 enzyme
 [image]   The activation energy of the catalyzed reaction is
 10 kJ
 True / False:  By speeding up a chemical reaction, you increase the amount of product produced.
 False.  You don’t make any more product; you just create the same amount of product faster.
 Increasing the concentration of a reactant speeds up a chemical reaction because
 there will be more frequent collisions between the reactants
 A slow-release medicine capsule controls its reaction speed by controlling (temperature/surface area/catalyst).
 surface area.; By dissolving slowly over time, the capsule exposes a small amount of medicine for reaction each hour.
 By using a catalyst, you (increase/decrease/do not change) the enthalpy of reaction (;H).
 do not change.; See the diagram below, comparing a catalyzed to a noncatalyzed reaction. ; ; [image]
 The enthalpy of reaction (;H);in the chemical reaction below is ; ; [image]
 negative 15 kJ
 When performing stoichiometry calculations, the coefficients of a balanced equation are interpreted as (gram/mole) ratios.
 mole ratios
 If 3 moles of HCl are consumed in the reaction below, how many moles of FeCl3 are produced? ; ___ HCl + ___ Fe2O3 ; ___ FeCl3 + ___ H2O ;
 1 mole FeCl3 will be produced
 Given the equation ___ H2O ; ___ H2 + ___ O2, how many moles of H2O would be required to produce 2.5 moles of O2?
 5 moles H2O
 Consider the equation __ CaCO3 ; __ CaO + __ CO2. If 3 moles of calcium carbonate decomposes according to the reaction above, how many grams of CO2 are produced?
 132 grams
 If;146 grams of HCl are are used in the reaction ___ HCl + ___ Fe2O3 ; ___ FeCl3 + ___ H2O, how many moles of FeCl3 are produced?
 1.3;moles FeCl3
 In the reaction ___ Zn + ___ H2SO4 ; ___ ZnSO4 + H2, how many grams of H2SO4 are required to produce 1.0 gram of H2?
 49 grams H2SO4
 Methane undergoes a combustion reaction to produce carbon dioxide and water vapor: ; ___ CH4 + ___ O2 ; ___ CO2 + ___ H2O ; If 6600 grams of CO2 are produced, what mass of oxygen gas was required?
 9600 grams of O2 was required
 Given the reaction __ Zn + __ HCl ; __ ZnCl2 + __ H2 , if 2 mol Zn and 5 mol HCl are allowed to react, what is the correct amount of ZnCl2 produced?
 This is a limiting reactant problem, since amounts of both reactants are given to you. ; By completing the stoichiometry, 2 mol Zn will produce 2 mol ZnCl2 and 5 mol HCl will produce 2.5 mol ZnCl2.; So the correct amount is the lower amount, 2 mol ZnCl2
 If amounts of both reactants are given to you in a stoichiometry problem, one of the reactants will be used up first, and we call that reactant the (excess/limiting) reactant.
 limiting
 The starting amount of the (excess/limiting) reactant produces the correct amount of product in a chemical reaction.
 limiting
 Can you draw out the stoichiometry roadmap?
 [image]
x

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