Chemistry Quiz 5

Chemical Reactions & Quantity Identify the chemical change in the following: Your answer:burning papercutting a piece of threadmelting ice in a glassboiling water in a pan What is the coefficient needed for Al when the equation Al + Cl2 = AlCl3 is balanced? Your answer:2136 Classify the type of reaction for the reaction Fe2S3 = 2Fe + 3S Your answer:double replacementdecompositioncombinationsingle replacement How many atoms are in one mole of aluminum atoms? Your answer:16.02 x 10 -236.026.02 x 10 23 What is the molar mass of the antacid Al(OH)3? Your answer:61.0 g/mole44.0 g/mole78.0 g/mole22.0 g/mole How many grams are in 1.5 moles of P? Your answer:23 g46.5 g47 g22.5 g How many moles are in 18.2 g of CO2? Your answer:41.4 moles2.42 moles0.414 moles801 moles What is the mass in grams of 0.250 moles of CH4? Your answer:4.00 g64.0 g4.0 g4 g What are the possible mole factors for Fe and O2 in the equation 4Fe + 3O2 = 2Fe2O3? Your answer:1 mole Fe/1 mole O2 and 1 mole O2/1 mole Fe4 mole Fe/2 mole Fe2O34 mole Fe/1 mole O2 and 1 mole O2/4 mole Fe4 mole Fe/3 mole O2 and 3 mole O2/4 mole Fe Consider the reaction N2 + 3H2 = 2NH3 How many moles of H2 are needed to completely react 56 g of N2? Your answer:1.0 moles of H23.0 moles of H22.0 moles of H26.0 moles of H2 Consider the reaction N2 + 3H2 = 2NH3 How many grams of NH3 are produced when 6.0 g of H2 completely react? Your answer:9.0 g of NH33.0 g of NH34.0 g of NH334 g of NH3 Complete and balance the following combustion reaction C4H8 + O2 = Your answer:C4H8 + O2 = 4CO2 + 4H2 OC4H8 + O2 = 4CO2 + H2 OC4H8 + 6O2 = 4CO2 + 4H2OC4H8 + O2 = CO2 How many grams are in 0.0150 mole of caffeine C8H10N4O2 Your answer:2.91 g0.825 g194 g129g What type of reaction is 2Fe + 3H2SO4 = Fe2(SO4)3 + 3H2? Your answer:double replacementdecompositioncombinationsingle replacement Which of the following is an oxidation? Your answer:Fe3+ + e- = Fe2+Fe3+ + 3e- = FeFe = Fe2+ + 2e-Cl + e- = Cl-Quiz 5 Chemical Reactions and Quantities Answers1) Identify the chemical change in the following: Correct Answer: burning paper2) What is the coefficient needed for Al when the equation Al + Cl2 = AlCl3 is balanced? Correct Answer: 23) Classify the type of reaction for the reaction Fe2S3 = 2Fe + 3S Correct Answer: decomposition4) How many atoms are in one mole of aluminum atoms? Correct Answer: 6.02 x 10 235) What is the molar mass of the antacid Al(OH)3? Correct Answer: 78.0 g/mole6) How many grams are in 1.5 moles of P? Correct Answer: 47 g7) How many moles are in 18.2 g of CO2? Correct Answer: 0.414 moles8) What is the mass in grams of 0.250 moles of CH4? Correct Answer: 4.00 g9) What are the possible mole factors for Fe and O2 in the equation 4Fe + 3O2 = 2Fe2O3? Correct Answer: 4 mole Fe/3 mole O2 and 3 mole O2/4 mole Fe10) Consider the reaction N2 + 3H2 = 2NH3 How many moles of H2 are needed to completely react 56 g of N2? Correct Answer: 6.0 moles of H211) Consider the reaction N2 + 3H2 = 2NH3 How many grams of NH3 are produced when 6.0 g of H2 completely react? Correct Answer: 34 g of NH312) Complete and balance the following combustion reaction C4H8 + O2 = Correct Answer: C4H8 + 6O2 = 4CO2 + 4H2O13) How many grams are in 0.0150 mole of caffeine C8H10N4O2 Correct Answer: 2.91 g14) What type of reaction is 2Fe + 3H2SO4 = Fe2(SO4)3 + 3H2? Correct Answer: single replacement15) Which of the following is an oxidation? Correct Answer: Fe = Fe2+ + 2e-