Chemistry question and answers for July 31, 2023
- Q 1)The predominant isotope of gold, 197 79Au, has an experimentallydetermined exact mass of 196.967 amu. What is the total nuclearbinding energy of gold in electronvolts per atom?Express your answer to...
- Q Â NH4CIO4 is the solid rocket fuel used by the U.S Space Shuttle. It reacts with itself to produce nitrogen gas (N2), chlorine gas (Cl2), oxygen gas (O2), water, and a...
- Q A pycnometer is a device used to measure densities.You are in the lab and need to measure the density of an unknownsolid. The pycnometer is weighed empty and once again...
- Q Calculate the [H+] and [OH-] of each of the following solutions.0.010 M HCl 0.010 M H2SeO4 0.025 M KOH 0.020 M Ba(OH)2
- Q 1)Choose all of the statements below that would changethe volume of gas depicted in Cylinder A to that of CylinderB.aâ–¡ Increase the pressure by a factor of 6 whileholding the...
- Q What is the difference between the virial equation ofstate and the SRK equation of state? When would you use one versusthe other?
- Q In your previous studies last semester, you encounteredreactions went to completion and were written A + B → C + D. Youare now learning about reactions that achieve equilibrium and...
- Q How can X-Ray Diffraction characterize the structure ormolecular structure of a polymer?
- Q A mixer used to prepare 1000 kg of 8 wt% sodium hydroxide (NaOH)solution. The feeds to the mixer are 10 mol% sodium hydroxidesolution in water and pure water. What are...
- Q Consider the following 50.00 mL of 0.300 M acetic acid (HC2H3O2)was titrated with 0.200 M potassium hydroxide (KOH).HC2H3O2 + KOH H2O + C2H3O2-K+A. Calculate the pH of the solution when...
- Q How will the following situations affect your final calculationof molarity of HC2H3O2? (higher, lower, unaffected. be specific) A)You wash the sides of the flask with deionized water to remove anyvinegar...
- Q calculate the change in pH when 3.00 ml of 0.1 M HCLis added to 100 ml of a buffer solution that is 0.1 M in NH3 and0.1 M in NH4Cl.Calculate...
- Q Calculate the wavelength of each of the following frequencies ofelectromagnetic radiationA) 104.8 MHz (typical frequency for FM radio broadcasting)B)1100 kHz (typical frequency for AM radio broadcasting)C) 835.6 MHz (common frequency...
- Q What are three main differences between High Performance LiquidChromatography and Gas Chromatography?
- Q Two methods were used to measure fluorescence emission of a dyeand following data were obtained;Method1Method2Mean13.8313.54Standard deviation0.2880.375# of measurements66A) Are the std. deviations are significantly different?B) Are the means are significantly...
- Q multiple choice QA mixture of N2, O2, and Ar has molefractions of 0.25, 0.65, and 0.10, respectively. What is thepressure of N2 if the total pressure of the mixture is3.9...
- Q During the purging steps in the Schlenk line experiment, whydoes the chemist close the nitrogen before opening the vacuum? Whatgas is being evacuated?
- Q A 0.035 mol sample of a weak acid, HA, is dissolved in 601 mL ofwater and titrated with 0.41 M NaOH. After 33 mL of the NaOHsolution has been added,the...
- Q Part ADetermine the [OH−] of a solution that is 0.140 M in CO3.Express your answer using two significant figures.Part BDetermine pH of this solution.Express your answer to two decimal places.
- Q Describe the appearance of:Silver nitrate testCommercial 1- bromobutane: unheated? and heated?Commercial t-butly chloride: unheated? and heated?Sodium iodide testCommercial 1- bromobutane: unheated? and heated?Commercial t-butly chloride: unheated? and heated?
- Q predict the signs of delta G, delta H, delta S, of the systemfor the following processesa)Ammonia melts at -60 degrees Celciusb) ammonia melts at -77 Celcius (normal melting point ofAmmonia)c)...
- Q Assume you dissolve 0.235 g of the weak acid benzoic acid,C6H5CO2H, in enough water to make 3.00 ✕ 102 mL of solution andthen titrate the solution with 0.128 M NaOH.C6H5CO2H(aq)...
- Q Tia has a sample of pure gold (Au). She weighed the sample andthe result was 12.6 grams. Tia wants to determine the number ofatoms in the sample. Calculate the number...
- Q How would I separate and purify 2 out of 3 of: 50% o-toluicacid, 40% fluorene, and 10% 1,4-dibromobenzene, using any of thefollowing: 1M NaOH, 6M NaOH, 1M HCl, 1M NaHCO3,...
- Q The decomposition of ozone into oxygen is believed to occur bythe following mechanism:O3Â Â <-->Â Â O2 +OÂ Â Â Â Â Â fast, equilibriumO +Â Â O3 --> 2O2Â Â Â Â Â Â slowThe rate constant for the overall rate law...
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