Chemistry question and answers for July 02, 2023
- Q A brine solution for cheese making contains 228.5 g of sodiumchloride (NaCl) in 500.0 mL of solution.(a) Calculate the molarity of sodium chloride in the brinesolution.(b) How many liters of...
- Q Calculate the mass and volume of 2.00 mmol of methyl salicylate,the theoretical yield of salicylic acid from that much methylsalicylate, and the minimum volume of water needed to recrystalizethat much...
- Q Calculate the pH of a 0.105 mol/L solution of carbonic acid.Answer is 3.668. How do I show my work for this question
- Q One way to remove magnesium (Mg2+) from water is toprecipitate it with a strong base such as sodium hydroxide (NaOH).Assuming the following unbalanced reaction describes theprocess. (a) Calculate the concentration...
- Q What is the difference between electron multiplier andphotoelectron multiplier? How does the pressure in MassSpectrometry affect the response of photoelectron multiplier? Howcould photoelectron multiplier be used in Mass Spectrometry?
- Q Predict the ΔHrxn for the following reaction: Rb(g) +Na+(g) → Rb+(g) + Na(g)ΔHrxn < 0 because the IE1 for Rb is lessthan the IE1 for NaΔHrxn > 0 because the...
- Q Calculate the vapor pressure at 80 C of a mixture of 35 mol % hexane and 65 mol % heptane. Calculate the mol fraction of each compound in the vapor...
- Q What is the difference between a toxic principle of a toxin andthe mode of action of a toxin? e.g. pyrrolizidine alkaloids
- Q A mixture of 0.47 mol of H2 and 3.59 mol of Cl2 in one-literflask is heated to 2800 oC. Calculate the equilibrium partialpressures of H2, Cl2 and HCl at equilibrium...
- Q Howmany isomers does Heptane, Hexane, Octane and Decane have? Draw outall isomers.
- Q Solutions of sodium carbonate and silver nitrate react to formsolid silver carbonate and a solution of sodium nitrate. A solutioncontaining 8.75 g of sodium carbonate is mixed with one containing6.00...
- Q 1. A chemist observed a gas being evolved in a chemical reactionand collected some of it for analysis. It was found to contain 80%carbon and 20% hydrogen. It was also...
- Q The distinctive odor of vinegar is due to acetic acid, HC2H3O2.Acetic acid reacts with sodium hydroxide in the following fashion:HC2H3O2(aq) + NaOH(aq)-> H2O(l) + NaC2H3O2(aq). If 2.52 mL ofvinegar requires...
- Q Explain why the preparation of nylon-6,10 occurs under milderconditions when decanedioyl dicholride is used instead ofdecanedioic acid
- Q Determine the percent ionization of a 0.014 M solution ofhypochlorous acid, HClO. The Ka for the acid is 3.5x10^–8.A) 3.5x10 ^–6 %B) 4.9x10^–9 %C) 7.0 x 10^–3 %D) 5.0 x10^–2...
- Q If you were given a 1000 mg/L stock solution of your metal and a100 mM solution of Na2EDTA, how much of each solution would youneed to make a 25 mL...
- Q Sketch the 5p and 4d orbitals
- Q Suppose 53.96g of COBr2 is placed in a 2.000L flask and heatedto 73.0degrees C. Calculate the molar concentrations of eachspecies at equilibrium. and calculate the percentage of theoriginal COBr2 that...
- Q Calculate the wave number corresponding to the most and leastenergetic spectral lines in the Lyman, Balmer and Paschen seriesfor the hydrogen atom.
- Q Describe how acid rain is formed. What types of industrialactivities contribute to acid rain formation? Are there options forremediation of lakes that have been “killed†by acid rain?
- Q A very old and tired , grey haired AP Chem instructor wanted todetermine the Ka of an unlabelled monoprotic acid in hisstockroom. He dissolved an unknown amount of acid in...
- Q Consider two solutions, one formed by adding 10 g of glucose(C6H12O6) to 1 L of water and the other formed by adding 10 g ofsucrose (C12H22O11) to 1 L of...
- Q Consider the voltaic cell Ag(s)|Ag+( 0.012 M )||Fe3+( 0.058 M),Fe2+( 0.044 M )|Pt(s)Part AWhat is Ecellinitially?Express your answer using three decimal places.Part B (multiple choice)As the cell operates, will  increase, decrease,...
- Q Use calculations to show what is the effect on the value of thewater of hydration should you fail to completely dry your compound.Explain your answer.
- Q Rate-study dataIn a study conducted at the same temperature, the following datafor reaction producing nitrosyl bromide were collected.TrialInitial [NO](M)Initial [Br2](M)Initial rate(M/s)10.1500.2404820.3000.24019130.3000.480383Part CWhat is the rate of the reaction when the...
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