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Chemistry Questions and Answers October 24, 2019

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Calculate the charge (in coulombs) carried by 100 nanomoles of calcium ions.

Calculate the heat released when 68.0 g of steam at 124C is converted to water at 45C.

Calculate the net energy change in kilo joules per mole that takes place on formation of MgF 2 (s) from the elements: Mg(s)+F2(g)MgF2(s) The following information is needed: Heat of sublimation for Mg(s)= 147.7 kJ/mol Eea for F(g)= 328 kJ/mol Bond dissociation energy for F2(g)= 158 kJ/mol Ei1 for Mg(g)= 737.7 kJ/mol Electrostatic interactions in

Calculate the number of milliliters of 0.753 M KOH required to precipitate all of
the Pb2* ions in 135 mL of 0.775 M Pb(NO3)2 solution as Pb(OH)2. The equation for the reaction is: Pb(NO3)2(aq) + 2 KOH(

the Pb2 ions in 135 mL of 0.775 M Pb(NO3)2 solution as Pb(OH)2. The equation for the reaction is Pb(NO3)2(aq) 2 KOH(aq) Pb(OH)2(s) 2 KNO3(aq)
the Pb2* ions in 135 mL of 0.775 M Pb(NO3)2 solution as Pb(OH)2. The equation for the reaction is: Pb(NO3)2(aq) + 2 KOH(

Calculate the number of moles of HCl(g) that must be added to 1.0 L of 1.000 M NaC2H3O2 to produce a solution buffered at each pH. (Ka for HC2H3O2 = 1.800x10^-5) a) pH = pKa b) pH = 3.92 c) pH = 5.49

Given: Concentration of Na2S2O3 is 0.1979 M Concentration of KIO3 is 0.1201 M Volume of 0.5 M of KI is 0.01 L Volume of 1.0 M HCL is 0.01 L Volume of KIO3 = 0.005 L Average Volume of Na2S2O3 is 0.0184 L (2.1) IO3 (aq) + I (aq) + H (aq) ----> I2(aq) + H2O(l) (2.2) mole of I total = mole of IO3- +mole of I- (2.3) I2(aq) + 2S2O3 (aq) ----> S4O6

The purpose of this lab is to experimentally determine the equilibrium constant, Kc. for the following chemical reaction:
Fe*imageimage

LabQuest 20 3. Calculate the initial concentration of SCN, based on its dilution by Fe(NO3)3 and water KSCN mL SCNli total ml (0.0020 M) In Test Tube 1, SCN(2 mL10 mL)(0.0020 M) 0.00040 M. Calculate this for the other three test tubes. 4. FeSCN2Jeq is calculated using the formula Aeg X Astd x FeSCNstd FeSCN2 Jeq where Aeq and Asd are the
Fe*imageimage

Complete and balance the molecular equation, including phases, for the reaction of aqueous bromide, CrBr2, and aqueous sodium carbonate, Na2COs CrBr2(aq) + Na2CO3(aq)

Complete the reaction schemes below by drawing the major product or products in the
boxes provided. Include proper stereochemistry. If more than one enantiomer is produced, add

boxes provided. Include proper stereochemistry. If more than one enantiomer is produced, add enant. in the box. 10 1. , 2. ,,, NaOH HBr BrH2O , H2 Pt 1) Hg(OAc),, H20 2) NaBH4 Br2 Brz, MEOH
boxes provided. Include proper stereochemistry. If more than one enantiomer is produced, add

Consider each pair of bases, and select which one is more basic. You may want to draw their conjugate acids, and think about which one is a stronger acid.
OH CEC:

(a) (c) CC H (d) OH CEN
OH CEC:

Consider the double replacement between calcium sulfate (CaSO4) and Sodium Iodide (Nal). If 34.7g of Calcium sulfate and 58.3 g of sodium Iodide are placed in a reaction vessel , how many grams of each product are produced. A) write the balance equation B)If you use up all the calcium sulfate, how many moles of calcium iodide will get

Consider the following data showing the initial rate of a reaction (A?products) at several different concentrations of A. [A](M) Initial Rate (M/s) 0.15 0.009 0.30 0.018 0.60 0.037 1.Estimate the value of the rate constant, k . Express your answer using two significant figures.