MOGCK CHEM Chemistry 20 Summative #2 Review (Gases) o C = K kpa = mmhg 300kPa = atm 45.0 psi= kpa
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1 Name: Chemistry 20 Summative #2 Review (Gases) Date: 1. Sketch a graph illustrating Boyle s Law Sketch a graph illustrating Charles Law V V P T 2. Convert the following using o C = K atm = kpa = 760 mmhg 1.0 psi = 6.9 kpa K = o C o C = K 222 K = o C 200 kpa = mmhg 300kPa = atm 45.0 psi= kpa 3. What is SATP? The temperature is o C and K. 4. What is STP? The temperature is o C and K. The pressure is kpa The pressure is kpa GAS LAWS - Combined (P 1 V 1 T 2 = P 2 V 2 T 1 ) and Ideal (PV = nrt) 5. A 10.0 L propane tank on a BBQ gas at 25.0 o C has a pressure of 150 kpa if the temperature drops to 25.0 what is the new pressure? 6. A hot air balloon has a volume of 345 L at SATP, what is the new volume when the balloon is at 1000 m above the surface where the pressure is 80.0 kpa and 8.0 o C. 7. A helium balloon at 22.0 o C aand 100 kpa has a volume of 5.55 L. Calculate the volume of the balloon after it rises 10 km up into the atmosphere where the temperature is 36.0 o C and the outside air pressure is 28.0 kpa. 8. A 1.00 L container of CO 2 (g) in Mr. Urlacher s prep room is pressurized to 1100 kpa at 20.0 o C. What volume of gas would fill the room when the pressure in the room is 100 kpa at 20.0 o C? 9. Freon (CFC) is used in many air conditioners. If 500 ml of freon at 1.50 atm and 24.0 o C is compressed to 250 ml at 3.50 atm what is the final temperature of the gas. (K and o C) 10. One teaspoon of baking soda produces about 0.13 g of carbon dioxide during baking. What volume of gas is produced in a cake while baking at a temperature of 200 o C and a pressure of 100 kpa? 1
2 11. What is the mass of He (g) that fills a hot air balloon with volume of 1100 L and a pressure of kpa and a temperature of 10.0 o C? 12. What volume would 5.00 g of methane occupy at STP? 13. What volume would 5.00 g of methane occupy at SATP 14. A BBQ propane tank holds 20 lbs of propane (20 lbs = 9.08 kg). If the tank was opened what volume would the gas take up at SATP? 15. What is the pressure exerted on a compressor when a 5.00 L tank of is filled with 29.6 g of oxygen at 25 o C? 16. A 200 L propane tank is used to heat a home. The tank can be filled to a maximum pressure of 800 kpa at 30 o C. What mass of gas can be added to the tank.? 17. At a vehicle manufacturing factory a technician adds g of a gas into each headlight bulb. The bulbs contain ml of gas at 150 kpa and 25 o C. Calculate the molar mass of this gas. What kind of gas is placed in vehicle headlights? 18. A plant uses 9.86 L (17.5 g) of this gas per day at SATP? What is the molar mass of the gas? Identify the gas? 19. A company that produces natural gas creates kg of polluting gas per day. The volume of this gas at kpa and 20.0 o C is L. What is the molar mass of the gas and what is its identity. 20. Design an experiment to test one of the gas laws (Boyles, Charles, or Ideal). Assume you have only everyday materials available to you, such as a punp, a pressure guage, a pail with lid, hot plate, scale, measuring tape, measuring cup or graduated cylinder, a balloon, and a thermometer. Problem: How can we test Law? Hypothesis: Variables - M R C Materials used (from list above) Procedure (step by step) Observation Chart Analysis formulae to be used 21. At a pressure of 95.0kPa a sample of gas has a volume of 415.0mL. What is the volume of the gas at 110kPa? 22. A sample of oxygen has a volume of 15.0L at 125kPa. What will the volume of the oxygen gas be at a pressure of 75kPa? 2
3 23. A sample of gas has a volume of 1.73L at a pressure of 860mmHg. What must the pressure be on this sample for the volume to change to 2.40L? 24. A sample of oxygen has a volume of 315mL at STP. What is the volume of the gas at 35 o C? 25. At 23 o C, a sample of hydrogen gas has a volume of 29.00L. To what temperature must this gas be heated to change the volume to 64.00L? L of chlorine gas at 109kPa and 23 o C is changed to 84.0kPa and 40.0 o C. What is the new volume? 27. A gas sample has a volume of 35.0L at 790mmHg and 22.0 o C, What is the volume at STP (745mmHg)? 28. A sample of fluorine gas with a volume of 45.0L at STP is changed to 117kPa and 30.0 o C. What is the new volume of the gas? 29. Find the molar mass of the following molecules: a. NO 3 - b. CH 3 COOH c. PbSO 4 d. Al 2 (SO 4 ) 3 e. (NH 4 ) 3 PO 4 3
4 30. Calculate the mass of each of the following: a mol of CO 2 at STP b mol of Ni(OH) Calculate the number of moles of the following: a kg of CuS b. 4046mg of Au at STP 32. Calculate the volume of g of butane gas C 4 H 10 at o C and kPa? 33. What is the 0.475g of an ideal gas has a volume of 450mL at 175kPa and 15.0 o C. What is its molar mass? 34. Explain how you change Celsius to Kelvin. 35. Explain the difference between SATP and STP. 36. Describe the difference between real and ideal gases 37. Explain the Kinetic Molecular Theory and its applications to this unit. 4
5 1. Complete the following table. Chemistry 20 Summative #2 Review (Stoich) Atom Group # Valence Electrons # Valence Orbitals Lewis Diagram # Lone Pairs # Bonding Electrons Br Ga Ca P H RXN TYPE BALANCED CHEMICAL EQUATION 2. NaCl (aq) + Br 2 (l) à NaBr (aq) + Cl 2 (aq) 3. Ca(NO 3 ) 2 (aq) + KOH (aq) à KNO 3 (s) + Ca(OH) 2(s) 4. C 4 H 10(g) + O 2 (g) à CO 2 (g) + H 2 O (g) 5. F 2 (aq) + P 4 (s) à PF 3 (aq) 6. H 3 PO 4 (aq) + NaOH (aq) à Na 3 PO 4 (aq) + HOH (l) 7. Cr 2 O 3 (s) à Cr (s) + O 2 (g) 8. Fe (s) + HCl (aq) à FeCl 3 (aq) + H 2 (g) 9. CH 3 CH 3 (g) + Br 2 (aq) à CH 2 Br CH 3 + HBr (g) 5
6 10. Write balanced chemical equations for the following reactions. Include states and reaction type. If you CANNOT balance the reaction you probably did not write the proper chemical formula. A. zinc is added to aqueous tin (II) chloride to form zinc chloride and tin. B. Propane is burned in a barbeque using oxygen and making carbon dioxide and water vapor. C. When heated copper (II) sulfate pentahydrate form copper (II) sulfate and water D. acetic acid is added to a solution of barium hydroxide to produce barium acetate and water (write water as HOH (l) it is easier to balance with hydroxide) E. A solution of lead (II) nitrate is added to a solution of sodium chloride F. 2,2 dimethyl decane (l) is burned. G. Al (s) is added to excess copper (II) nitrate solution. H. 3 hexyne (l) is added to excess fluorine (aq). The product is a liquid. I. butanoic acid (l) is added to ethanol to form a solid ester J. When hydrogen is added to an open flame it produces a pop sound. 6
7 11. What is the limiting and excess reagent in a chemical reactions? g of lithium is added to 10.0 g of nitrogen what mass of product will be produced? Which substance is the limiting reagent? Which substance is in excess? ml of mol/l Ba(OH) 2 (s) is added to 50.0 ml of mol/l Ga(CH 3 COO) 3 (aq). Which substance is the limiting reagent? Which substance is in excess? 14. What mass of lead (II) nitrate is required to react with excess potassium iodide to produce 4.26 g of lead (II) iodide? 15. What is the concentration of 25.0 ml of NaOH (aq) used to neutralize an acid spill when ml of mol/l HCl (aq)? 16. What volume of hydrogen gas is produced at SATP when a 1.68 g of magnesium is totally dissolved in excess nitric acid? 17. Sulphur is burned by reacting with oxygen to form a dangerous gas SO 2 (g). In a combustion furnace 2.20 kg of sulfur is burned. What volume of oxygen is required at 560 kpa and 450 o C? 18. What is the concentration of 30.0 ml Na 2 CO 3 when it is neutralized by 250 ml of mol/l H 3 BO 3 (aq)? 19. A 50.0 g candle (C 25 H 52 (s) ) is burned until there are 16.0 g left. What volume of carbon dioxide is produced at 18.2 o C and 99.5 kpa? 7
8 g of benzoic acid are added to excess methanol. What mass of ester will be created? 21. Calculate the concentration of hydrochloric acid using bromothymol blue as an indictor Titration of 25.0 ml of HCl (aq) with mol/l Na 2 CO 3 (aq) TRIAL Final buret reading (ml) Initial buret reading (ml) Volume of Na 2 CO 3 (aq) added (ml) Color at endpoint blue green green green 22. The number of moles of ethane, C2H6, that can react with 9 moles of oxygen, O2, according to the equation 2C2H6(g) + 7O2 à 4CO2(g) + 6H2O(l) is: 23. How many grams of copper(ii)chloride is needed to react with 19.0g of iron, according to the following equation: 3CuCl2 + 2Fe à 3Cu + 2FeCl3 24. How many grams of ammonia is produced when 12.0g of nitrogen gas is reacted according to the following equation: 3H2 + N2 à 2NH3 25. Given the following BALANCED equation: 4NH3 + 5O2 à 6H2O + 4NO If 2.30moles of ammonia (NH3) are consumed, how many moles of NO are produced? 26. Consider the following BALANCED equation: 2NaOH(s) + CO2(g) à Na2CO3(s) + H2O(l) Assuming that there is an excess of carbon dioxide, what is the mass of sodium hydroxide that is needed to produce 22.0g of sodium carbonate? 8
9 27. When the reaction Al2(SO4)3 + CaCl2 à AlCl3 + CaSO4 is balanced, using simplest whole numbers, the quantity of calcium chloride used is 28. Consider the following BALANCED equation: 2C2H6(g) + 7O2(g) à 4CO2(g) + 6H2O(l) What volume of C2H6 at STP is required to produce 8.0g of water? 29. Consider the following BALANCED equation: 2C2H6(g) + 7O2(g) à 4CO2(g) + 6H2O(l) What mass of oxygen is required to react completely with 16.2L of C2H6 at STP? g of cadmium reacts with 0.790g of sulphur to produce cadmium sulphide as shown by Cd(s) + S(s) à CdS(s) What is the limiting reagent? 31. Consider the BALANCED equation: 2KClO3(s) + 3S(s) à 2KCl(s) + 3SO2(g) If 29.4g of potassium chlorate were to react with 7.2g of sulphur, what is the mass of potassium chloride that is formed? The following 3 questions (32-34) refer to the info below. 30.0g of potassium is reacted with 12.0g of nitrogen, according to the following BALANCED equation: 6K + N2 à 2K3N 32. Which chemical is the limiting reagent? 33. How much excess is there for the other chemical? 34. How many grams of potassium nitride can be produced? 9
10 The following 3 questions (35-37) refer to the info below. 20.0g of potassium is reacted with 11.0g of nitrogen, according to the following BALANCED equation: 6K + N2 à 2K3N 35. Which chemical is the limiting reagent? 36. How much excess if there for the other chemical? 37. How many grams of potassium nitride can be produced? Use the following reaction for questions CH 3 NO 2 (l) + 3O 2 (g)à 4CO 2 (g) + 6H 2 O(l) + 2N 2 (g) 38. What mass of H2O is produced when 22.7g of CH3NO2 is burned? 39. What combined volume of gas at STP is produced if 3.36g of CH3NO2 is burned? 40. What volume of O2 at STP is required to produce 2.78g of CO2? 41. What mass of N2 is produced when 0.490g of CO2 is produced? Use the following reaction for questions A 8.79mL sample of H3PO4 is titrated with 97.8mL of 0.789M of NaOH. 2NaOH + H3PO4 à Na2HPO4 + 2H2O 42. What is the molar concentration of pure H3PO4? 43. Calculate the density of pure H3PO4? 10
11 Use the following information for questions : Before analyzing a fertilizer sample containing NH4NO3, a chemist makes a test solution by dissolving 66.3g of pure NH4NO3 and diluting it to 150.0mL. If the chemist wishes to carry out the titration reaction NH4NO3(aq) + NaOH(aq) à NH3(g) + H2O(l) + NaNO3(aq) Such that the reaction requires 43.0mL of NaOH when 19.5mL of solution is titrated, 44. What is the molarity of the NaOH she should use? 45. What volume of NH3 at STP would be produced? Use the following reaction for question FeO + 2C + O2 à 2Fe + 2CO2 46. A 13.4g FeO sample has a 56.0% yield. What mass of Fe can the sample produce? 47. A 33.9g FeO sample produces 85.8g of Fe. What is the % yield of FeO? 48. A 460.4g FeO pure sample produces 324.8g of Fe. What is the % yield of the reaction? 49. What mass of FeO with a yield of 56.8% is needed to make 34.9g of solid iron? 11
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