Inorganic Chemistry Questions

4 Use Hess s Law to determine the AH for the reaction shown below based on the information that follows 10 pts 2 Al s 3 Cl g 2 AICI s 2 Al s 6 HCl aq H g Cl g HCl g AICI s AH 2 AICI aq 3 H g AH 1049 kJ 2 HCl g AH 1845 kJ HCI aq AH 74 8 kJ AICI aq AH 323 kJ

The electrodeposition of scandium can be used to isolate the solid rare earth metal through the following reduction reaction Sc aq 3e Sc s What mass of Sc s can be produced in 75 min using a current of 2 24 A Choose the closest answer Relevant data 1 ampere A 1 coulomb per second Faraday s constant F 96 485 coulombs per mole of electrons Atomic weight of Sc 44 96 03 61 g 04 70 g 01 57 g 02 28 g

Explain how lipids make a cell membrane impenetrable to ionic and polar substances

Q Explain what are namomaterials and why their properties are different from micro and macro structures

10 Name the enzyme that catalyzes the following reaction LACTOSE 89 WATER 1 name of enzyme G G

6 Predict what would happen to the pH if a Weak acid was added to water b Weak base was added to water Strong acid was added to water d Strong base was added to water Weak acid was added to buffered solution f Weak base was added to buffered solution g Strong acid was added to buffered solution e h Strong acid was added to buffered solution

8 Which gland secretes enzymes into small intestine 9 Give one example of commercial use of enzyme

Fill in the blank Ethanol can readily be prepared from a reaction between water and in the presence of a small amount of sulfuric acid Oglucose O sucrose O ethanal O ethane

2 Balance the following redox reactions in a basic solution using the oxidation number method B I Mn 2 02 2 H Mn H O 1 2

Complete the following table Molarity Name of solute sodium hydroxide potassium sulfate sodium chloride iron II nitrate hydrochloric acid ammonium chloride Dilution Initial concentration 6 00 M 4 50 M 3 50 M 6 50 M Formula of solute 0 200 L 350 mL 0 450 L Initial volume Final 450 mL Molarity 250 mL 1 60 M 0 950 M 1 20 M 1 20 M 0 900 M Volume of solution 0 500 L 2 40 M 275 mL concentration 2 30 M 450 mL 750 mL Moles of solute 1 20 L 0 45 mol 0 23 mol Final volume Complete all the following blanks correctly please 1 65 mol 800 mL 0 850 L Grams of solute 167 g 84 0 g Volume of water added 400 mL 0 550 L

Chemistry Describe the production of FeSi 15 using smelting including key process parameters and reaction

6 What role do enzymes play in digestion 7 Name the enzyme present in the stomach What type of biological molecule does it wor

What is the function of proteins in the cell membrane

Zero point energy for a particle in the infinite potential well one dimensional box problem arises because Group of answer choices the energy at which the particle escapes the box is arbitrarily set at 0 with all of the bound state energies negative in value the 1 D box starts at the O point namely x 0 due to the Heisenberg Uncertainty Principle the particle cannot be at rest with a momentum of 0 and a kinetic energy of 0 since there is some certainty in the position it must be inside the box which means there must be some uncertainty in the momentum the lowest energy state has 0 energy Duh

Collecting Data from the Posted Virtual Lab Video Unknown Liquid Determination 1 Mass of dry flask foil and rubber band g 2 Temperature of boiling water C 3 Mass of dry flask foil rubber band and vapor g 4 Volume of 125 mL flask L 5 Atmospheric pressure atm Calculations 1 Amount of vapor nvapor mol 2 Mass of vapor mvapor g S Trial 1 776849 96F 17 950 139ml 76 cm 3 Molar mass of compound g mol 4 Average molar mass g mol 5 Standard deviation of molar mass Show calculations for trial 1 here for full credit Trial 2

D 5x104 J of heat are added 35 kg of water initially at 12 C What is the water s final temperature

A person has a 0 61L sample of nitrogen gas at 28 44 C and a pressure of 25 00atm If the sample is reacted with excess hydrogen gas according to the reaction below what mass in grams of ammonia NH3 is likely to form Reaction N2 g 3H2 g 2NH3 g

I for each shown 1 H C CH CH F 2 H 2 0 3 H N The following draw a resonance structure more stable than the one 2 Rank the following H c N 8 CH3 NH in order of stability Put an x on any non viable H C11 CH H o N 6 CH3 N 0 CH3 N 0 7 CH3

7 How important are buffers to the proper functioning of cells

A reaction produces 3 45mol of oxygen gas If the pressure in the room is 1 25atm and the temperature if 427 74 C what volume of oxygen gas was produced in liters Reaction 6CO2 g 6H O g C6H12O6 1 902 g

1 When an enzyme is exposed to an unfavorable pH the activity level a Increases b decreases c stays the same

160 5 mol of an ideal gas is at 1 47 atm at 47 70 C what is the volume of the ga

3 What would you expect to see if catalase that has been exposed to suboptimal conditions is placed with hydrogen peroxide

How does adding a catalyst affect the rate of a reaction It slows down the reaction by decreasing the activation energy It slows down the reaction by increasing activation energy It speeds up the reaction by decreasing the activation energy It speeds up the reaction by increasing activation energy Next

For each of the following statements determine if it describes nuclear fission nuclear fusion or both 15 takes place in stars 16 used for energy via nuclear power plants 17 unstable atomic nuclei become more stable via this reaction 18 involves a larger nuclei breaking into smaller particles A Fission O O O O B Fusion O O O C Both Fission Fusion O O O O

4 Complete the following sentences using the words active or inactive Bubbling of hydrogen peroxide in the presence of catalase indicates that the enzyme is Lack of bubbling of hydrogen peroxide in the presence of catalase indicates that the enzyme is

In the laboratory you dissolve 24 0 g of potassium carbonate in a volumetric flask and add water to a total volume of 250 mL What is the molarity of the solution What is the concentration of the potassium cation M What is the concentration of the carbonate anion M M

2 Consider the following balanced thermochemical equation for the decomposition of sulf trioxide 2SO3 g 2S s 302 g a Is this an exothermic or endothermic reaction b What is AHrrn for the reverse reaction IL AHran ata with oveose S2 790 4 kJ

1 When you place catalase with hydrogen peroxide what do you expect to see

4 What is an enzyme substrate complex 5 In which system of our body do enzymes work outside cells

Which of the following statements is false When the central atoms of oxoacids holds the same number of oxygen atoms the acid strength increases from bottom to top within a group When the central atoms of oxoacids holds the same number of oxygen atoms the acid strength increases from left to right within a period The strengths of binary acids decrease from top to bottom within the same group For a given central atom the acid strength of an oxoacid increases as the number of oxygens on the central atom increases O The strengths of binary acids increase from left to right within the same period

14 How much faster is the hydrogen peroxide degradation when it is catalyzed by catalase

Indicate whether the following processes are exothermic or endothermic Process CO2 CO2 g C3Hs g 502 g 3CO2 g 4H 0 C6H12O6 s 6C s 6H2 g 302 9 H O H O s Exothermic Endothermic

6 Two compounds of nitrogen nitrogen tetroxide N O and hydrazine N H4 are used as rocket fuels When the two compounds are mixed they ignite spontaneously and produce nitrogen gas and water Balance the following equation for the reaction III a N O4 1 N g H O g b If 8 00 g nitrogen tetroxide and 4 00 g hydrazine are mixed determine the following quantities 1 limiting reactant N H 1 2 mass of product N 3 mass of excess reactant

8 Consider the reaction Br Ch 2BrCl Keq 244 What are the equilibrium concentrations of each reactant and product if a 1 0 D container initially contained 3 14 mole each of Br2 and 12 Show all calculations 9 Write the Keq expression 1 X 15 62 45623 4 2 49 05 2 2

32 Identify the missing particle X in the following nuclear reaction 23994Pu 4 He X OA 235 6Cm B 24392 Cm C 24392U OD 23592U OE None of the above

How does increasing surface area of the reactants affect the rate of a reaction increases reaction rate O does not affect reaction rate decreases reaction rate not enough information provided to answer

Iron metal reacts with a copper sulfate solution CuSO4 aq Which of the following would result in the highest rate of reaction Iron powder in 1 M CuSO4 aq A solid piece of iron in 2 M CuSO4 aq Iron powder in 2 M CuSO4 aq O A solid piece of iron in 1 M CuSO4 aq Review

Use the standard enthalpies of formation to calculate the AH in kJ mol of isopropanol combustion 2 C3H8O 1 9 O g 6 CO g 8 H O g AH kJ mol 318 1 Formula Bromine Br g Br HBr g Calcium Ca s CaO s CaCO3 s Carbon C s graphite C s diamond CO g CO g CH g CH OH C H g C H4 g C H6 g C H5OH C3H g C3H6O I acetone AH kJ mol 111 9 0 36 3 0 634 9 1207 6 0 1 88 110 5 393 5 74 6 238 6 227 4 52 4 84 68 277 6 103 85 248 4 Formula C3H8O I isopropanol C6H6 C6H12O6 s glucose C12H22011 s sucrose Chlorine Cl g Cl g HCI g Fluorine F g F g HF g Hydrogen H g H g Nitrogen N g NH3 g NH4NO3 s NO g N O g 49 1 1273 3 2226 1 121 3 0 92 3 79 38 0 273 3 218 0 0 0 45 9 365 6 91 3 81 6 Formula Oxygen O g 03 g H O g H O Silver Ag s AgCl s Sodium Na s Na g NaCl s Na CO3 s NaHCO3 s Sulfur Sg s rhombic Sg s monoclinic SO g SO g H SO4 1 AH kJ mol 0 142 7 241 8 285 8 127 0 0 107 5 411 2 1130 7 950 8 0 0 3 296 8 395 7 814 0

Consider again the titration of HC H3O2 with NaOH Let s say that you need to add 0 383 moles of NaOH in order for the indicator dye to change color How many moles of HC H3O2 must you have had to start

Pick the odd one out O Ethanol Hexane Ooil Carbon tetrachloride

PH 3 9 orange pH 1 Brown bH 4 6 bright green pH 2 7 Pink pH 3 3 dark green PH 1 5 light Blue pH 3 0 purple Acid Red Base Blve Copp 4 001 M solution of HCl 7 pH of 7 1 34 10th Solution of HCL t is neutral 7 L of a solution containing olg of HCL pH 1 1 Yellow Round answers to tenths b A 09 M solution of H Bares 7 A pH 7 com 8 8 7 L of a solution containing 1 1 g of nitric acid 9 1 5L of a solution containing 5 bg of HI 10 7351 of a solution containing

9 The equilibrium constant is given for one of the reactions below Determine the value of the missing Kc 2SO2 g O2 g 2 SO3 g SO3 g 1 2 O2 g SO2 g Kc 1 7 x 106 Kc 22 a 3 4 102 b 8 5 12503 2502 02 KC 2 1 T 7x c 1 3 x 103 d 7 7 x 10 4 e 8 5x10

35 In what way is 14C nucleus changed to 14N nucleus by this decay 14Cle 14N A In the above reaction a proton is converted to a neutron B In the above reaction a neutron is converted to a proton O C In the above reaction a positron is converted to an alpha particle D There is no change in the nucleus because the mass remains 14 E None of the above is true

How many moles is 9010 of H O 1 00 18 02 0 500

Water Which would be best for thermally insulating not transferring heat Glass Substance Elements Lead Gold Silver Copper Iron Aluminum Compounds Ethanol Water Materials Glass Pyrex Granite Sand At 298 K Specific Heat Capacity Cs J g C 0 128 0 128 0 235 0 385 0 449 0 903 2 42 4 18 0 75 0 79 0 84

Consider the titration of H3C6H5O7 with NaOH Let s say that you need to add 0 04 mole of NaOH in order for the indicator dye to change color How many moles of H3C6H5O7 must you have had to start Report answer to the correct sig figs Do not provide units

c Catalysts speed up chemical reactions by lowering the activation energy of reactions Enzymes act as catalysts in your body Explain specifically in what way the enzyme lowers the energy of activation for the reaction shown above What is the enzyme doing that results in it being a catalyst lowering the activation energy and making the reaction go faster

Give the expression for the Ksp for the following Ksp O A Ca 2 CO32 CaCO3 B CaCO3 Ca CO3 O C CaCO3 OD Ca CO3 CaCO3 s Ca 2 CC

Molecule H Quantum Calculated Amax nm Energy kJ mole Woodward Fieser Difference Calculated Amax nm Energy kJ mole