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Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is ____________ g. 2. (4 points) The number of oxygen atoms in 1.500 moles of Ca3(PO4)2 is . 3. (5 points) In the reaction 5 SO2 + 2 MnO4- + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation numbers of S and Mn in SO2 and MnO4- are the reducing agent? and , respectively. Which of these is . 4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular mass of 90.0 g/mole is . 5. (3 points) The mass percentage of hydrogen in C3H8 is . 6. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3] 7. (4 points) Consider the species: NH3, CH3OH, H3PO4, Ba(OH)2, HNO3 Which is(are) both a strong acid and strong electrolyte? Which is(are) a Bronsted base? 8. (4 points) Balance the following reaction by inspection: (CN)2 + 9. (10 points) Write the formula for aluminum sulfite magnesium permanganate ammonium thiocyanate H2O → H2C2O4 + NH3 page 2 10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Cu(NO3)2 (aq) + Na3PO4 (aq) (b) KClO3 (aq) + NH4NO3 (aq) → (c) CH3COOH (aq) + Ba(OH)2 (aq) → → Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: 11. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 75.0 mL of a 1.00 M solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. page 3 12. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 148.0 grams of H3PO4 is produced and 55.2 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles page 4 13. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. (3 points) If each marshmallow covering Texas was turned into a carbon atom, how many grams of carbon would this be? 14. (10 points) Name the following compounds. TiF3 SiCl4 K2O2 CaC2O4 Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (4 points) Balance the following reaction by inspection: As4S6 + O2 → As4O6 + SO2 2. (3 points) The molecular formula of a compound with the empirical formula H5C2O and a molecular mass of 90.0 g/mole is . 3. (4 points) Consider the species: H2CO3, HClO4, Ba(OH)2, C2H5OH, NH3 Which is(are) both a strong acid and strong electrolyte? Which is(are) a Bronsted base? 4. (3 points) The mass percentage of carbon in C3H8 is . 5. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3] 6. (3 points) The mass of Mn (in grams) that is contained in 3.00 moles of Mn2O5 is ____________ g. 7. (4 points) The number of oxygen atoms in 2.500 moles of Mg3(PO4)2 is 8. (5 points) In the reaction 2 MnO4- + 5 SO2 + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation numbers of Mn and S in MnO4- and SO2 are the oxidizing agent? . and . , respectively. Which of these is page 2 9. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Pb(NO3)2 (aq) + KI (aq) → (b) H2CO3 (aq) + KOH (aq) → (c) NH4Br (aq) + Ba(ClO3)2 (aq) → Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: 10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 50.0 mL of a 2.00 M solution of Na2S is mixed with 100.0 mL of a 1.00 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. page 3 11. (10 points) Write the formula for aluminum nitrite sodium permanganate ammonium thiosulfate 12. (10 points) Name the following compounds. VCl4 BrF5 MgO2 K2C2O4 13. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. (3 points) If each marshmallow covering Texas was turned into a carbon atom, how many grams of carbon would this be? page 4 14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 184.0 grams of H3PO4 is produced and 65.5 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (3 points) The mass percentage of hydrogen in C4H8 is . 2. (3 points) The mass of Cr (in grams) that is contained in 2.00 moles of Cr2O3 is ____________ g. 3. (4 points) Balance the following reaction by inspection: NH3 + (CN)2 H2C2O4 → 4. (5 points) In the reaction 16 H+ + 2 MnO4- + H2O + 5 C2O42- → 2 Mn2+ + 10 CO2 + 8 H2O, the oxidation numbers of Mn and C in MnO4- and C2O42- are of these is the reducing agent? and , respectively. Which . 5. (3 points) The molecular formula of a compound with the empirical formula HCO and a molecular mass of 87.0 g/mole is . 6. (4 points) The number of oxygen atoms in 4.00 moles of Ca3(PO4)2 is 7. (4 points) . When 26.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3]. 8. (4 points) Consider the species: C3H7OH, NH3, HF, H2SO4, Ba(OH)2 Which is(are) a Bronsted base? Which is(are) both a strong acid and strong electrolyte? page 2 9. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Cu(SO4)2 (aq) + NaHCO3 (aq) → (b) Pb(NO3)2 (aq) + (c) H3PO4 (aq) + NH4Cl (aq) → NaOH (aq) → Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: 10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 2.00 M solution of Na2S is mixed with 50.0 mL of a 1.50 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. page 3 11. (10 points) Name the following compounds. SF6 CaO2 Na2C2O4 TiCl4 12. (10 points) Write the formula for potassium permanganate magnesium thiosulfate ammonium sulfite 13. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. (3 points) If each marshmallow covering Texas was turned into a carbon atom, how many grams of carbon would this be? page 4 14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 219 grams of H3PO4 is produced and 85.5 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (4 points) Consider the species: NH3, KOH, H3PO4, C2H5OH, H2SO4 Which is(are) a Bronsted base? Which is(are) both a strong acid and strong electrolyte? 2. (4 points) Balance the following reaction by inspection: As4O6 + SO2 → As4S6 + O2 3. (4 points) The number of hydrogen atoms in 1.500 moles of (NH4)3PO4 is . 4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular mass of 135.0 g/mole is . 5. (3 points) The mass percentage of carbon in C2H6 is . 6. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is 7. (5 points) In the reaction 16 H+ + 5 C2O42- g. +2 MnO4- → 2 Mn2+ + 10 CO2 + 8 H2O, the oxidation numbers of C and Mn in C2O42- and MnO4- are Which of these is the oxidizing agent? and , respectively. . 8. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3] page 2 9. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 1.00 M solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. . 10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Ba(OH)2 (aq) + (b) NH4NO3 (aq) + (c) K2S (aq) Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: CH3COOH (aq) KClO3 (aq) + FeCl2 (aq) → → → page 3 11. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 448.0 grams of H3PO4 is produced and 98.2 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles page 4 12. (10 points) Name the following compounds. Na2Cr2O7 TiCl3 SF4 K2O2 13. (10 points) Write the formula for calcium thiocyanate aluminum permanganate ammonium nitrite 14. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. If each marshmallow covering Texas was turned into a carbon atom, how many grams of carbon would this be? (3 points) Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is ____________ g. 2. (4 points) The number of oxygen atoms in 1.500 moles of Ca3(PO4)2 is . 3. (5 points) In the reaction 5 SO2 + 2 MnO4- + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation numbers of S and Mn in SO2 and MnO4- are the reducing agent? and , respectively. Which of these is . 4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular mass of 90.0 g/mole is . 5. (3 points) The mass percentage of hydrogen in C3H8 is . 6. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3] 7. (4 points) Consider the species: NH3, CH3OH, H3PO4, Ba(OH)2, HNO3 Which is(are) both a strong acid and strong electrolyte? Which is(are) a Bronsted base? 8. (4 points) Balance the following reaction by inspection: (CN)2 + 9. (10 points) Write the formula for aluminum sulfite magnesium permanganate ammonium thiocyanate H2O → H2C2O4 + NH3 page 2 10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Cu(NO3)2 + Na3PO4 (b) KClO3 + NH4NO3 → (c) CH3COOH (aq) + Ba(OH)2 (aq) → → Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: 11. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 75.0 mL of a 1.00 M solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. page 3 12. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 148.0 grams of H3PO4 is produced and 55.2 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles page 4 13. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. (3 points) If each marshmallow covering Texas was turned into a carbon atoms, how many grams of carbon would this be? 14. (10 points) Name the following compounds. TiF3 SiCl4 K2O2 CaC2O4 Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (4 points) Balance the following reaction by inspection: As4S6 + O2 → As4O6 + SO2 2. (3 points) The molecular formula of a compound with the empirical formula H5C2O and a molecular mass of 90.0 g/mole is . 3. (4 points) Consider the species: H2CO3, HClO4, Ba(OH)2, C2H5OH, NH3 Which is(are) both a strong acid and strong electrolyte? Which is(are) a Bronsted base? 4. (3 points) The mass percentage of carbon in C3H8 is . 5. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3] 6. (3 points) The mass of Mn (in grams) that is contained in 3.00 moles of Mn2O5 is ____________ g. 7. (4 points) The number of oxygen atoms in 2.500 moles of Mg3(PO4)2 is 8. (5 points) In the reaction 2 MnO4- + 5 SO2 + H2O → 5 SO42- + 2 Mn2+ + 4 H+, the oxidation numbers of Mn and S in MnO4- and SO2 are the oxidizing agent? . and . , respectively. Which of these is page 2 9. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Pb(NO3)2 (aq) + KI (aq) → (b) H2CO3 (aq) + KOH (aq) → (c) NH4Br (aq) + Ba(ClO3)2 (aq) → Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: 10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 50.0 mL of a 2.00 M solution of Na2S is mixed with 100.0 mL of a 1.00 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. page 3 11. (10 points) Write the formula for aluminum nitrite sodium permanganate ammonium thiosulfate 12. (10 points) Name the following compounds. VCl4 BrF5 MgO2 K2C2O4 13. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. (3 points) If each marshmallow covering Texas was turned into a carbon atoms, how many grams of carbon would this be? page 4 14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 184.0 grams of H3PO4 is produced and 65.5 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (3 points) The mass percentage of hydrogen in C4H8 is . 2. (3 points) The mass of Cr (in grams) that is contained in 2.00 moles of Cr2O3 is ____________ g. 3. (4 points) Balance the following reaction by inspection: NH3 + (CN)2 H2C2O4 → 4. (5 points) In the reaction 16 H+ + 2 MnO4- + H2O + 5 C2O42- → 2 Mn2+ + 10 CO2 + 8 H2O, the oxidation numbers of Mn and C in MnO4- and C2O42- are of these is the reducing agent? and , respectively. Which . 5. (3 points) The molecular formula of a compound with the empirical formula HCO and a molecular mass of 87.0 g/mole is . 6. (4 points) The number of oxygen atoms in 4.00 moles of Ca3(PO4)2 is 7. (4 points) . When 26.8 g of Ba(OH)2 is dissolved in enough water to make 250.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3]. 8. (4 points) Consider the species: C3H7OH, NH3, HF, H2SO4, Ba(OH)2 Which is(are) a Bronsted base? Which is(are) both a strong acid and strong electrolyte? page 2 9. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Cu(SO4)2 + NaHCO3 → (b) Pb(NO3)2 (aq) + (c) H3PO4 (aq) + NH4Cl (aq) → NaOH (aq) → Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: 10. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 2.00 M solution of Na2S is mixed with 50.0 mL of a 1.50 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. page 3 11. (10 points) Name the following compounds. SF6 CaO2 Na2C2O4 TiCl4 12. (10 points) Write the formula for potassium permanganate magnesium thiosulfate ammonium sulfite 13. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. (3 points) If each marshmallow covering Texas was turned into a carbon atoms, how many grams of carbon would this be? page 4 14. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 219 grams of H3PO4 is produced and 85.5 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles Name (PRINT CLEARLY) Exam 1 (100 points) Seat Number September 21, 2016 Chemistry 1303.002 On my honor, I have neither given nor received unauthorized aid on this exam. Signed Date Fill in the blanks with the appropriate word, phrase, number, or unit. 1. (4 points) Consider the species: NH3, KOH, H3PO4, C2H5OH, H2SO4 Which is(are) a Bronsted base? Which is(are) both a strong acid and strong electrolyte? 2. (4 points) Balance the following reaction by inspection: As4O6 + SO2 → As4S6 + O2 3. (4 points) The number of hydrogen atoms in 1.500 moles of (NH4)3PO4 is . 4. (3 points) The molecular formula of a compound with the empirical formula HCO2 and a molecular mass of 135.0 g/mole is . 5. (3 points) The mass percentage of carbon in C2H6 is . 6. (3 points) The mass of Mn (in grams) that is contained in 2.00 moles of Mn2O3 is 7. (5 points) In the reaction 16 H+ + 5 C2O42- g. +2 MnO4- → 2 Mn2+ + 10 CO2 + 8 H2O, the oxidation numbers of C and Mn in C2O42- and MnO4- are Which of these is the oxidizing agent? and , respectively. . 8. (4 points) When 56.8 g of Ba(OH)2 is dissolved in enough water to make 500.0 mL of solution, the molarity of hydroxide ions is _____________M. [molar mass of Ba(OH)2, 171.3] page 2 9. (7 points) Calculate the final concentration of sodium sulfide, Na2S, when 25.0 mL of a 1.00 M solution of Na2S is mixed with 50.0 mL of a 0.500 M solution of Na2S. SHOW ALL WORK and UNITS LOGICALLY AND CLEARLY. . 10. (14 points) TWO of the following reactions will occur in aqueous solution. Decide which TWO and then (i) complete and balance the molecular reaction , and (ii) write the net ionic equation for the reaction. (include states of all substances) [You do not need to show the full ionic equation.] (a) Ba(OH)2 (aq) (b) NH4NO3 + (c) K2S (aq) Molecular equation: Net Ionic equation: Molecular equation: Net Ionic equation: + CH3COOH (aq) KClO3 → + FeCl2 (aq) → → page 3 11. (18 points) Water reacts with P4S10 to give phosphoric acid and H2S as shown below. [Molar masses are the numbers in small font just below the formulas on the reaction below.] Fill in the unshaded boxes in the table below for a reaction in which 448.0 grams of H3PO4 is produced and 98.2 grams of P4S10 remains unreacted. CLEARLY show your work in the space below the table. Make sure that it is easy for the grader to locate each calculation. No work; No units; No points! P4S10 444.5 + 16 H2O 18.0 → 4 H3PO4 98.0 + 10 H2S 34.1 Initial moles moles moles Change moles moles moles Final moles moles moles moles page 4 12. (10 points) Name the following compounds. Na2Cr2O7 TiCl3 SF4 K2O2 13. (10 points) Write the formula for calcium thiocyanate aluminum permanganate ammonium nitrite 14. a. (5 points) A regular sized marshmallow is 38.1 mm tall, occupies an area of 7.51 cm2, and has a mass of 7.2 grams. If a layer of marshmallows was spread over an area the size of the state of Texas (268,601 square miles), how many moles of marshmallows would this be. Some conversions factors you might need: 1 mile = 1.609 km; 16 oz = 1 lb, 454 g = 1 lb; 12 in = 1 ft; 1 in = 2.54 cm] SHOW ALL WORK LOGICALLY AND CLEARLY. b. (3 points) How many bags of marshmallows would one have to purchase, if each bag contains 10 oz (ounces)? c. If each marshmallow covering Texas was turned into a carbon atoms, how many grams of carbon would this be? (3 points)