Chemistry question and answers for October 04, 2023
- Q Calculate the pH at 25°C of a 0.73M solution of potassiumcyanide KCN . Note that hydrocyanic acid HCN is a weak acid with apKa of 9.21 .
- Q One mole of an ideal gas (CP = 5R/2) in a closedpiston/cylinder is compressedfrom Ti = 298 K, Pi = 0.1 MPa to Pf = 0.25 MPa by thefollowing pathways....
- Q Based on gas chromatography results, predict the approximateretention times that probably would be obtained for the followingcompounds, and explain your predictions. (Compare the boilingpoints and intermolecular forces for each compound.)3-Methyl-2-butanone...
- Q An aqueous solution contains a mixture of .175 M HF(Ka = 7.2 x 10-4) and .250 M HNO2(Ka = 4.0 x 10-4). Calculate the pH of thissolution (express your pH...
- Q In a constant-pressure calorimeter, 60.0 mL of 0.320 M Ba(OH)2was added to 60.0 mL of 0.640 M HCl. The reaction caused thetemperature of the solution to rise from 21.70 °C...
- Q What is the molar solubility of iron(III) hydroxide (Ksp = 2.5 x10-39) in water at 25
- Q Thedensity of an aqueous solution containing 15.0% ethanol (C2H5OH) bymass is 0.974 g/mL.A) calculate the molality of this solution. B) calculate thesolutions molarity.C) what volume of the solution would contain...
- Q How does adding a solute to a pure solvent change the freezingpoint? Does it increase or decrease and why does it do this? Is thechange in the freezing point of...
- Q Be able to state the purpose of the glycerol 3-phosphate andmalate-aspartate shuttles. Be able to state why the glycerol3-phosphate shuttle is considered to less efficient than themalate-aspartate shuttle in promoting...
- Q Asparaginase catalzyes the following reaction:Asparagine + H2O → aspartate + NH4+The enzyme has been isolated from two different organisms.Asparaginase A has a KM for asparagine of 10 μM and a...
- Q 1.) The following reaction was carried out in a 2.50L reactionvessel at 1100 K:C(s)+H2O(g)?CO(g)+H2(g)If during the course of the reaction, the vessel is found tocontain 5.50mol of C, 15.8mol of...
- Q Name two different chemicals we have discussed or read aboutthat we have added to the carbon cycle at levels that did not existnaturally.a. Which functional group class does each chemical...
- Q write the reaction that is happening in the hydrogen generatorin symbols, including all states and balance (used zinc, HCl, andH20)Write the reaction that is happening in the oxygen generator insymbols,...
- Q balance the following equation, and identify the oxidizing andreducing agents.Express your answer as a chemical equation.Identify all of the phases in your answer.MnO-4(aq)+CH3OH(aq)=-Mn2+(aq)+HCO2H(aq)(acidic solution)
- Q (a) The interhalogen molecule bromine monofluoride, BrF, has abond length of 176 pm and a dipole moment of 1.42 D. Calculate theabsolute electrical charge (in coulombs) on either end of...
- Q A 215 g block of copper at 505.0°C is plunged into 1.000 kg ofwater (T = 23.4 °C) in an insulated container. What will be thefinal equilibrium T in °C...
- Q The normal freezing point of water(H2O) is 0.00 °C andits Kfp value is 1.86 °C/m. Anonvolatile, nonelectrolyte that dissolves inwater is sucrose .How many grams of sucrose,C12H22O11(342.3 g/mol), must be...
- Q Your boss wants you to make some buffers using the acetic acid /acetate buffering system. You find 0.100 M stock solutions of Naacetate and acetic acid on the shelf. Use...
- Q - The cube length is 3.23 cm. What is the volume of the cube? _ml- How many significant figures should be in the calculatedvolume?- The measured mass of the cube...
- Q The electric usage of LED is 8 watts and incandescent bulbs takeup 40 watts. The lifetime of LED bulbs is 25 000 hours and thelifetime for incandescent bulb is 2500...
- Q An unknown compound has a formula of CxHyOz. You burn .1523g ofthe compound and isolate .3718g of CO2 and .1522 g of H2O. What isthe empirical formula of the compound?...
- Q 1.What mass of water is needed to dissolve 43.5 g of copper (II)chloride to prepare a 0.521 molal solution?2. Calculate the boiling point of a solution made from 224 gof...
- Q From an initial mix of: 2 mol Cl2, 1 mol Br2, 1 mol I2, 1 molCl−, 1 mol Br−, & 5 mol I−; the total quantity ofBr2  present after all possible...
- Q A mixture of 0.750 mol H2 and 0.750 mol I2was placed in a 1.00 L flask at 430°C. The equilibrium constantKc for the reaction is 54.3 at this temperature.Calculate the...
- Q Make a qual scheme flow chart for the following Ions: Ag+, Mn2+,Cu2+, Fe3+, Ni2+, Pb2+, Ba2+, Al
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