Chemistry question and answers for September 27, 2023
- Q Which of the followingare redox reactions ? Explain your answer on the basis of changesin oxidation number.1. CuSO4 + 2NaOH → Cu(OH) 2 + Na2SO42. 2Al +3MgSO4 → 3Mg +...
- Q Q. A polydisperse sample of PS is prepared by mixing threemonodisperse samples in the following proportions:A : 1 g, 10,000 molecular weight PSB : 2 g, 50,000 molecular weight PSC...
- Q a. A student weighs out 9.18 g ofCrSO4, transfers it to a500. mL volumetric flask, adds enough water todissolve the solid and then adds water to the 500mL mark on...
- Q A detergent containing an unknown concentration of phosphate isanalyzed using the standard addition method. Initially, thissolution emitted an instrumental signal of 4.78 μA. An aliquot of10.0 ml of 3.12 M...
- Q Order these chemical species by increasing pH of an 0.1M aqueoussolution of each. That is, imagine making an 0.1M solution of eachspecies. Select 1 next to the species that makes...
- Q BrO3- (aq) + 5Br- (aq) + 6H+ (aq)  → 3Br2 (l) + 3H2O(l)[BrO3-]0  [Br-]0  [H+]0  Initial Rate0.1000.1000.1008.00 E-40.2000.1000.1001.60 E-30.2000.2000.1003.20 E-30.1000.1000.2008.00 E-41. what is the rate law?2. what is the rate constant?3. what is the...
- Q How many joules will be required to convert 354.0 grams ofbenzene to vapor at 25 °C? (ΔH vap of benzene is 33.9 kJ.)
- Q Calculate the number of molecules present in each of thefollowing samples.4.75mmol of phosphine,4.75g of phosphine,1.25x10-2g of lead(II) acetate, †â€1025x10-2 moles of lead(II) acetate, †â€a sample of benzene, â€...
- Q 52.0 mL of 0.757 M hydrochloric acid is added to 12.1mL of potassium hydroxide, and the resulting solution is found tobe acidic.20.8 mL of 0.630 M calcium hydroxide is required...
- Q 56.7 mL of 1.18 M hydrochloric acid is added to 28.7mL of barium hydroxide, and the resulting solution is found to beacidic.21.3 mL of 1.27 M sodium hydroxide is required...
- Q A beaker with 135 mLmL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q After you synthesize a molecule, you are asked to determine yourproduct’s melting point and mass, collect its IR spectrum, andanalyze it by thin layer chromatography. Which of these experimentsgives you...
- Q When 40.0 mL of 0.580 M H2SO4 is added to 40.0 mL of 1.16 M KOHin a coffee-cup calorimeter at 23.50°C, the temperature rises to30.17°C. Calculate H of this reaction...
- Q Discuss ethanol as a transportation fuel.Identify at least three advantages and three disadvantages ofits use.Assess the government’s policy regarding ethanol and make arecommendation as to whether you feel use of...
- Q In which of the following pairs of properties are bothproperties chemical properties? (mark all that are correct)a) Has a density of 1.45 g/mL and is bright yellowb) Causes seizures in...
- Q The map of the lac operonis:Â Â Â Â POZYÂ Â The promoter (P) region is thestart site of transcription through the binding of RNA polymerasebefore actual mRNA production. Mutationally altered promoters(P-) cannot bind RNA polymerase....
- Q 1 ) What volume of 0.150 M hydrochloric acid reacts with excesslead (II) nitrate solution in order to yield 1.88 g lead ( II)chloride precipitate?2) Calculate the boiling point and...
- Q In the Fluorometric analysis of Quinine in TonicWater LabPipette 50 μL of the tonic water into the 10 mL flask and diluteto 10.00 mL with 0.05 M H2SO4. This will...
- Q Determine the concentrations you would use in order to find therate law for a given reaction.a.   Here is one set ofconditions – fill out the rest of the table with enough...
- Q The percentage composition by mass of a certain fuel is given asC 90%, H 3.5%, O 3% and remainder is incombustible. The fuel isburnt in air and the resulting dry...
- Q For 540.0mL of a buffer solution that is 0.165M inCH3CH2NH2 and 0.155M in CH3CH2NH3Cl, calculate the initialpH and the final pH after adding 0.020mol of HCl.
- Q For the following reaction,  9.45 gramsof  nitrogen monoxide are allowed toreact with  8.22 gramsof  oxygen gas .nitrogen monoxide(g)+  oxygen(g)   nitrogendioxide(g)What is the maximum mass of  nitrogendioxide that can beformed?   gramsWhat is the  FORMULA for thelimiting reagent?What mass of the...
- Q For the following reaction,  10.1grams of  nitrogen gas are allowed toreact with  5.97 gramsof  oxygen gas .nitrogen(g)+  oxygen(g)   nitrogenmonoxide(g)What is the maximum mass of  nitrogenmonoxide that can beformed?   gramsWhat is the  FORMULA for thelimiting reagent?What mass of the excess...
- Q 25.0mL sample of 0.170 M CH3NH2with 0.145 MM HBra) determine pH at equivalence pointb) determine the pHpH after adding 6.0 mLmL of acid beyond theequivalence point.given:Initial pH: 11.94volume of added...
- Q Name or write the formulas of the followingcompounds:NO_______________________Dichlorine monofluoride____________________NO2_______________________Chlorine Monofluoride____________________N2O_______________________Calcium fluoride____________________SO3_______________________Disulfur dichloride____________________SO2_______________________Disulfur tetrachloride____________________P4S3_______________________Sulfur Tetrafluoride____________________As2O5_______________________Sulfur trioxide____________________Ionic CompoundsName or write the formulas of the followingcompounds:Fe3P2_______________________Copper (II) iodide____________________Fe3N2_______________________Iron (II) sulfide____________________FeS_______________________Gold (III) chloride____________________FeO_______________________Vanadium (V)...
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