UConn CHEM 1127Q - reviewfinalf14 (4 pages)

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University Of Connecticut
Course:
Chem 1127q - General Chemistry
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REVIEW Chapters 1 9 A Consider the metal sodium 1 How many grams are there in 0 100 mole 2 How many atoms are there in 1 00 g 3 How many moles are there in 3 76 g 4 Compare sodium to potassium and magnesium with respect to a Atomic radius b Ionization energy c electronegativity 5 Compare Na to Na with respect to size 6 Write the electron configuration and orbital diagram for sodium 7 Sodium D line has a wavelength of 589 nm Calculate a Its frequency b E in kJ mol B When sodium is added to water d 1 00 g mL the following reaction occurs 2Na s 2H2O 2Na aq 2OH aq H2 g 1 How many grams of sodium will react with 10 0 mL of water 2 Five grams of sodium are added to 25 00 mL of water at 20 C Assume 100 yield for the next 4 questions a d a What is the limiting reactant b How many grams of H2 are produced c What are the masses of the reactants after the reaction is complete d What is the molarity of Na produced What is the molarity of OH produced e If only 0 100 g of H2 is produced what is the percent yield f What volume of H2 will be produced at 20 C if the gas is collected over water vp 17 54 mm Hg The barometric pressure is 754 6 mm Hg g What is the mass of a gas that will effuse times as fast as H2 3 Calculate H for the reaction 4 If 1 00 g of sodium and an excess of water reacted how much heat will be evolved 5 If the reaction is done in a bomb calorimeter heat capacity 9 33 kJ C using 2 50 g of sodium and an excess of water what is the final temperature of the system if its initial temperature is 20 00 C C Write balanced net ionic equations using smallest number coefficients to represent the reactions between aqueous solutions of the following compounds 1 Sulfuric acid and sodium hydroxide 2 Sodium hydroxide and iron III nitrate 3 Hypochlorous acid and potassium hydroxide 4 Ammonia and perchloric acid 5 Sulfite ions in a basic solution with solid cobalt III hydroxide to give sulfate ions and solid cobalt II hydroxide 6 Dichromate ions in an acidic solution with iodide ions to form chromium III ions and triodide I3 ions D Consider the reaction between aqueous solutions of scandium III chloride and silver I sulfate 1 How many mL of 0 0750 M silver sulfate is required to react completely with 200 0 mL of 0 120 M scandium III chloride 2 How many grams of precipitate can be theoretically obtained E Consider water at 20 C Its density is 1 00 g mL its vapor pressure at 20 C is 17 54 mm Hg Five grams are poured into a 20 0 L flask 1 Would all the water vaporize 2 If not how much would vaporize 3 Calculate the heat of vaporization for water F Substance Y has a vapor pressure of 120 mm Hg at 25 C 1 It is put into a 20 0 L tank at 25 C The pressure in the tank is measured to be 100 mm Hg at the same temperature What phase s of Y is are in the tank 2 Substance Y is transferred without loss of contents at the same temperature to a 10 0 L tank What is the pressure in the tank after equilibrium is reached What phase s of Y is are in this tank 3 If 0 0100 mol of substance Y are put into 2 00 L tank at 25 C what phase s of Y is are in the tank after equilibrium G An unknown substance X has a vapor pressure of 158 mm Hg at 25 C Its normal boiling point is 73 C Its triple point is 5 C 70 mm Hg The density of the solid is 1 12 g cm3 while that of the liquid is 0 98 g cm3 Its critical temperature is 100 C while its critical pressure is 1534 mm Hg 1 Draw the phase diagram for X 2 label the solid liquid and gas regions 3 Label the triple point with the letter A 4 Label the critical point with the letter B 5 Draw a solid arrow across the curve crossed when X melts 6 Draw a dashed arrow across the curve crossed when X sublimes 7 Draw a crooked arrow across the curve crossed when X condenses 8 Calculate Hvap of X Do not use the critical point or the triple point in your calculations ANSWERS A 1 2 30 g 2 2 62 x 1022 atoms 3 0 163 mol 4 a Na K Na Mg 5 Na Na b Na K Na Mg c Na K Na Mg 6 1s2 2s2 2p6 3s1 1s 7 a 5 09 x 10 14 s 2s 1 2p 3s b 203 1 kJ mol B 1 12 8 g 2 a Na b 0 220 g d Na OH 10 3 M e 45 5 c Na 0 00 g H2O 21 08 g f 2 70 L g 32 0 g mL 3 368 6 kJ 4 8 01 kJ 5 22 15 C C 1 H aq OH aq H2O 2 OH aq Fe3 aq Fe OH 3 s 3 HC O aq OH aq C O aq H2O 4 NH3 aq H aq NH4 aq 5 SO32 aq 2Co OH 3 s SO42 aq 2Co OH 2 s H2O 6 Cr2O72 aq 9I aq 14H aq 2Cr3 aq 3I3 aq 7H2O D 1 4 80 x 102 mL 2 103 g E 1 no 2 0 344 g 3 42 8 kJ mol F 1 gas 2 120 mm Hg liquid and gas 3 gas G 1 7 see below 8 28 0 kJ mol


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