Unit 3 Review THE MATH OF CHEMICAL EQUATIONS 1. What quantity of sulfur dioxide, SO2 (64.0 g/mole), is produced when 245 g of sulfuric acid, H2SO4 (98.0 g/mole) reacts completely with zinc metal? Zn° + 2 H2SO4 ZnSO4 + SO2 + 2 H2O a) 64.0 g b) 80.0 g 2. c) 128 g d) 160 g How many grams of oxygen gas react with 4.00 moles of PH3 according to this equation? 4 PH3(g) + 6 O2(g) 6 H2O(l) + P4O6(s) a) 32.0 b) 89.6 3. c) 134 d) 192 How many moles of FeS2 are required to produce 64 grams of SO2 according to the equation 4FeS2(s) + 11O2(g) 2Fe2O3(s) + 8SO2(g) a) 0.40 b) 0.50 4. c) 3.2 d) 4.5 Glass, SiO2, reacts with hydrofluoric acid, HF, according to this equation SiO2 + 4 HF 2 H2O + SiF4 Which reagent is completely consumed when 2 moles of SiO2 is added to 6 moles of HF? a) SiF4 c) HF b) H2O d) SiO2 5. How many grams of O2 will be produced from 55.4 g of KClO3? 2 KClO3 ---> 2 KCl + 3 O2 Ans ________ 6. Use the following equation to answer the following questions. 2 Na + Cl2 ---> 2 NaCl a. Starting with 30.1 g of Na and 22.4 g of Cl2, how many grams of NaCl can be made? Ans ________ b. How many g of excess reactant remain? Ans ________ c. Afterwards, 17.1 grams of NaCl are produced by the reaction. What is the % yield? Ans ________ 7. A molecule is 87.5% N and is 12.5% H. What is its empirical formula? Ans ________ If this molecule's formula weight is 48 g/mol, determine its actual formula: _____________ CHEMICAL EQUATIONS 1. Which set of coefficients balances the equation for the complete combustion of ethane, C2H6? __C2H6 + __O2 __CO2 + __H2O a) 1,3,2,3 c) 2,6,4,5 b) 1,6,2,6 d) 2,7,4,6 2. When this expression is balanced, 2C3H6 + O2 CO2 + 6H2O what is the coefficient of oxygen, O2? a) 6 b) 9 3. During a “titration lab,” an acid was neutralized by the following reaction: NaOH + HCl NaCl + H2O This reaction would be classified as… a) synthesis b) decomposition c) double replacement d) single replacement 4. Which reaction below would be classified as a decomposition reaction? a) NaHCO3 NaOH + CO2 b) 2 H2 + O2 2 H2O c) 2 AgNO3 + Cu° Cu(NO3)2 + 2 Ag° d) Ba(OH)2 + H2SO4 BaSO4 + 2 H2O 5. The complete combustion of ethane, C2H6, c) 12 d) 18 produces a) C2H5OH b) CH3COOH c) CO2 and H2 d) CO2 and H2O Use the activity series predict whether the following reactions will occur... If YES, then write the products -- If NO, then write 'N. R.' (no reaction) 6. Al + FeCl2 ---> ___________________ 7. Cu(NO3)2 + Ca ---> _____________________ 8. Zn + NaCl ---> _____________________ Predict the products: 9. CuSO4 + AgCl ---> __________________ 10. C2H6 + O2 ---> ____________________ 11. Suppose you made a Micro-Rocket with butane (C4H10) as the fuel. What is the correct ratio of fuel to O2? 12. What gas is formed when Zn metal is mixed with hydrochloric acid, HCl? a) CO2 c) O2 b) He d) H2 Nomenclature The following random compounds need either names or formulas. Help them discover their identity! 1. Cs3P ___________________ 2. SiCl4 ___________________ 3. platinum (IV) iodate _________ 4. calcium nitrite ________ 5. stannous chloride ___________ 6. HBrO3 ________ 7. sulfur trioxide _______________ 8. Fe(NO3)2 ___________________ 9. (NH4)4C ___________________ 10. hydrochloric acid _________ 11. mercury (II) oxalate ________ 12. CoCO3 _________________ 13. CO ___________ 14. How many electrons were transferred to make AlCl3? _____ MATTER 1. Which property is always conserved during a chemical reaction? a) mass c) pressure b) volume d) solubility 2. Which one of the following is the correct formula for aluminum oxide? a) AlO c) Al2O3 b) Al6O6 d) Al3O2 3. What is the name of the compound CF4? a) b) c) d) fluorocarbonate carbon tetrafluoride tricarbon fluoride carbon difluorate 4. Sodium nitride has the formula Na3N. What is the formula for magnesium nitride? a) Mg2N c) Mg3N2 b) Mg3N d) Mg2N3 5. What is the mass of one mole of aluminum sulfate, Al2(SO4)3? a) 630 g c) 273 g b) 342 g d) 123 g ACIDS, BASES, & SALTS 1. Which of the following is an acid? a) NaOH c) HCl b) NH3 d) H2O 2. The acid, H2S, is correctly named as: a) hydrosulfuric acid b) sulfuric acid c) dihydrogen sulfide d) hydrogen(I) sulfide OXIDATION AND REDUCTION 1. Hydrogen gas was produced according to the following equation: Zn° + 2 HCl ZnCl2 + H2 Which chemical is oxidized? a) Zn° c) ZnCl2 b) HCl d) H2 2. Chemists can make “Trees” by using the reaction: Cu° + 2Ag+ 2 Ag° + Cu2+ Cu°, is _____ electrons and being _____. a) gaining, oxidized b) gaining, reduced c) losing, oxidized d) losing, reduced Bonds that hold everything together Match the following compounds to the three bond types. Each answer may be used once, more than once, or not at all. C) Covalent Bond I) Ionic Bond M) Metallic Bond ___1. KBr ___6. CaCl2 ___11. ZnI2 ___2. Cu ___7. Br2 ___12. Ag ___3. CO2 ___8. Na2O ___13. NaCl ___4. Pb ___9. SiO2 ___14. C(graphite) ___5. CH4 ___10. brass (Cu + Zn) ___15. C3H8 Match the following statements to the three bond types. Each answer may be used once, more than once, or not at all. C) Covalent Bond I) Ionic Bond M) Metallic Bond ___1. the strongest bond ___6. malleable and ductile ___2. conducts electricity as a solid ___7. conducts electricity when dissolved in water ___3. alternating positive and negative particles ___8. involves a transfer of electrons ___4. sharing electrons between two atoms ___9. involved in molecules and in network solids ___5. positive ions in a “sea of electrons” ___10. does not usually conduct electricity Exception?: _______________ 11. State whether each molecule below is polar or non-polar. Explain to each other why you made your choice. Write the Lewis dot structures, geometry, and polarity for the following: 12. O2 13. HF 14. BCl3 15. SO3 16. NO31 - 17. CH3OH Classify the bond type as non polar, polar, or ionic by calculating ∆EN: 18. KBr ∆EN = ________ bond type = _________ 19. CO ∆EN = ________ bond type = __________ 20. SiI2 ∆EN = ________ bond type = _________