Final CHM1045 Review Exam 1 3 and quizzes 1 8 questions 1 Name or give formula for the following A Mn2 SO3 3 B Aluminum Chromate C SrHCO3 D P2F5 E Chlorous Acid F Chromium VI Acetate 2 What is your weight in milligrams 3 A compound is found to have the following composition 17 9 C 47 8 O and 34 3 Na and a molar mass of 134 g mol Give the molecular formula of the compound 4 Complete the following table P N 0 E Element 52 6 Cr 81 1 Br 5 How many moles of oxygen atoms are there in 19 8g of iron III phosphite 6 How much does 5 50 x 1025 molecules of sulfur dioxide weigh 7 The masses of the three isotopes of a new element saintssatium St are listed below with their relative natural abundances This is a highly volatile element capable of producing foul odors What is the average atomic mass of saintssatium Isotope 24St 25St 26St Abundance 78 990 10 000 11 010 Mass amu 23 985042 24 985837 25 982593 8 Answer the following questions about the reaction below A P4 5 O2 2 P2O5 B How many oxygen atoms are in one molecule of diphosphorus C How many moles of oxygen are needed to react with 0 50 mol of P4 pentoxide D If 4 0 mol of P4 is placed in a reaction vessel with 18 2 mol of oxygen which is the limiting reagent 9 What mass of antimony chloride can be produced from 2 45 g of chlorine according to the unbalanced reaction below Yes that means you need to balance it A Sb Cl2 SbCl3 10 23 5 g of sodium hydroxide react with 65 75 g of barium nitrate according to the reaction below and yields 8 4744 g of barium hydroxide Molar masses are given below the equation A 2 NaOH Ba NO3 2 Ba OH 2 2NaNO3 molar masses 40 0 261 3 171 3 85 0 B What is the limiting reagent C What is the theoretical yield D What is the percent yield True False 1 Rutherford s scattering experiment showed that matter was mostly empty space 2 Rutherford s scattering experiment showed that the path of alpha particles passing through matter can be deflected or even reflected by the electrons 3 The solubility of sugar in water is an example of a chemical change 4 The density of mercury is an example of a chemical property 5 The flammability of methane is an example of a physical property 6 All solids have a greater density than their corresponding liquid phases 7 Animals release negligible quantities of carbon dioxide to the atmosphere 8 Isotopes may be separated by chemical change Bonus Calculate the molar mass of calcium nitrate tetrahydrate 1 Choose the solution that has the greatest number of ions per liter of solution a 3 M NaOH b 2 5g AgCl in 500 0 mL of water c 2 M Fe2 SO4 3 d 5 0 g K3PO4 in 1 0 L of water e 2 5 M FeCl2 2 10 3 g of potassium sulfate are dissolved in enough water to produce 750mL of solution Calculate the concentration of all ions in solution 3 Describe how you prepare 1 25L of a 1 75M sodium bromide solution 4 Write the molecular and net ionic equations for the precipitation reaction between ammonium hydroxide and chromium III nitrate 5 What is the concentration of acetic acid in solution of 24 88 mL of a 0 1200 M sodium hydroxide solution is required to neutralize 50 00 mL of the acid 6 What mass of precipitate is formed when 125 mL of 0 30 M barium chloride is mixed with 445 mL of 0 15 M potassium sulfate 7 For the following reaction MnO4 Fe OH 2 MnO2 Fe3 a Identify the oxidizing agent What is being reduced 8 Write the oxidation and reduction half reactions for the following disproportionate reaction Label each half reaction i Cl2 2OH ClO Cl H2O b Oxidation c Reduction 9 A sample of air occupies 2 6 L at 3 2 atm and 15 C At what temperature would it occupy 1 5 L at a pressure of 5 5 atm 10 What volume of CO2 measured at 25 C and 2500 torr is produced from the combustion of 25 g of propane a C3H8 5O2 3CO2 4H2O 11 Calculate the molar mass of a gas if 1 259 g occupies 786 mL at 25 C and 780 torr 12 In the Van der Waals equation below circle the term that corrects for the attractive forces between the gas particles P an2 v2 V nb nRT 13 How many strong acids are listed HCl HI H2S H3PO4 HNO3 H2CO3 a Answer True False 1 The density is a physical property that can be used to identify a gas 2 Neon has a higher rate of diffusion than oxygen 3 At 375 K nitrogen molecules are moving faster than argon atoms 4 In a 50 50 mixture of hydrogen and helium at 298K helium exerts the greater pressure 5 The average kinetic energy of a sample of gas particles is proportional to their Kelvin temperature 6 At a given temp a standard bell curve represents the distribution of particle speeds in a sample of gas 7 The chemical potential of a system is related to the height of the desktop 8 Energy may be transferred from the system to the surroundings by heat and work but not from the surroundings to the system 1 125 mL of a 0 50 M Na2SO4 solution at 25 2 C is mixed with 50 mL of a 1 25 M barium chloride solution at the same temperature in an FSU thermos The final temperature is 27 6 C What is the enthalpy of reaction per mole of precipitate formed Be sure to include the sign for the enthalpy 2 From the following heats of reaction H 572 kJ a 2 H2 g O2 g 2 H2O l H 92 kJ b N2O5 g H2O l 2 HNO3 l c N2 g 3 O2 g H2 g 2 HNO l H 348 kJ Calculate the heat of reaction for 2 N2 g 5 O2 g 2 N2O5 g 3 Calculate the enthalpy reaction for the following reaction using standard enthalpies of formation found on the last page 2 CH2 g 3 O2 g 2 CO g 4 H2O l 4 You are the Science officer on the Enterprise and you detect a mysterious energy that has a wavelength of 32 nm and a frequency of 2 1 x 1015 s 1 Is this stuff electromagnetic radiation Why or Why not 5 Calculate the wavelength of a photon that is associated with an electron relaxing from the n 4 energy level to the n 3 energy level in hydrogen Is this process absorption or emission Circle one 6 Below is the mathematical description of the Heisenberg Uncertainty principle x mv h 4 a What is the term x b What does this equation mean 7 How many electrons …
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