Chemical Reactions D Practice Problem 5 Answers

Chemical Reactions D Practice Problem 5 Answers Chemical Reactions Practice Problem 5 Answers This document provides detailed solutions to practice problem 5 designed to solidify your understanding of chemical reactions We will cover the following key concepts Balancing Chemical Equations Ensuring the law of conservation of mass is followed Types of Chemical Reactions Identifying and classifying reactions based on their characteristics Stoichiometry Calculating the amounts of reactants and products involved in a reaction Practice Problem 5 The following reactions are observed in a laboratory setting For each reaction balance the chemical equation classify the reaction type and calculate the amount of product formed given the amount of limiting reactant Reaction 1 Given Sodium metal Na reacts with chlorine gas Cl2 to produce sodium chloride NaCl 10 grams of sodium Na reacts completely with excess chlorine gas Questions Balance the chemical equation for this reaction Classify the reaction type Calculate the mass of sodium chloride NaCl produced Reaction 2 Given Methane gas CH4 reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O 5 grams of methane CH4 reacts completely with 15 grams of oxygen gas O2 2 Questions Balance the chemical equation for this reaction Classify the reaction type Calculate the mass of carbon dioxide CO2 and water H2O produced Identify the limiting reactant Reaction 3 Given Calcium carbonate CaCO3 decomposes upon heating to produce calcium oxide CaO and carbon dioxide CO2 25 grams of calcium carbonate CaCO3 is heated Questions Balance the chemical equation for this reaction Classify the reaction type Calculate the mass of calcium oxide CaO produced Answers Reaction 1 Balanced Chemical Equation 2 Na Cl2 2 NaCl Reaction Type Synthesis or Combination Reaction Two reactants combine to form a single product Mass of NaCl produced Step 1 Convert grams of Na to moles using its molar mass 2299 gmol 10 g Na 1 mol Na 2299 g Na 0435 mol Na Step 2 Use the mole ratio from the balanced equation to determine moles of NaCl produced 0435 mol Na 2 mol NaCl 2 mol Na 0435 mol NaCl Step 3 Convert moles of NaCl to grams using its molar mass 5844 gmol 3 0435 mol NaCl 5844 g NaCl 1 mol NaCl 254 g NaCl Therefore 254 grams of sodium chloride NaCl are produced Reaction 2 Balanced Chemical Equation CH4 2 O2 CO2 2 H2O Reaction Type Combustion Reaction Rapid reaction with oxygen producing heat and light Mass of CO2 and H2O produced Step 1 Convert grams of CH4 and O2 to moles using their respective molar masses 1604 gmol and 3200 gmol 5 g CH4 1 mol CH4 1604 g CH4 0312 mol CH4 15 g O2 1 mol O2 3200 g O2 0469 mol O2 Step 2 Determine the limiting reactant by calculating the theoretical moles of CO2 produced from each reactant From CH4 0312 mol CH4 1 mol CO2 1 mol CH4 0312 mol CO2 From O2 0469 mol O2 1 mol CO2 2 mol O2 0235 mol CO2 O2 is the limiting reactant because it produces less CO2 Step 3 Use the mole ratio from the balanced equation and the moles of the limiting reactant 4 O2 to determine the moles of CO2 and H2O produced 0235 mol O2 1 mol CO2 2 mol O2 0118 mol CO2 0235 mol O2 2 mol H2O 2 mol O2 0235 mol H2O Step 4 Convert moles of CO2 and H2O to grams using their respective molar masses 4401 gmol and 1802 gmol 0118 mol CO2 4401 g CO2 1 mol CO2 519 g CO2 0235 mol H2O 1802 g H2O 1 mol H2O 424 g H2O Therefore 519 grams of carbon dioxide CO2 and 424 grams of water H2O are produced Reaction 3 Balanced Chemical Equation CaCO3 CaO CO2 Reaction Type Decomposition Reaction A single reactant breaks down into two or more products Mass of CaO produced Step 1 Convert grams of CaCO3 to moles using its molar mass 10009 gmol 25 g CaCO3 1 mol CaCO3 10009 g CaCO3 0250 mol CaCO3 Step 2 Use the mole ratio from the balanced equation to determine moles of CaO produced 0250 mol CaCO3 1 mol CaO 1 mol CaCO3 0250 mol CaO 5 Step 3 Convert moles of CaO to grams using its molar mass 5608 gmol 0250 mol CaO 5608 g CaO 1 mol CaO 140 g CaO Therefore 140 grams of calcium oxide CaO are produced Conclusion Through this practice problem weve reinforced our understanding of balancing chemical equations classifying reaction types and performing stoichiometric calculations Remember these skills are fundamental to understanding the behavior of matter and predicting the outcomes of chemical processes Continue practicing with different examples and apply these principles to realworld scenarios to further solidify your knowledge