Chemistry question and answers for July 19, 2023
- Q A diver breathes a helium and oxygen mixture with an oxygen molefraction of 0.052. What must the total pressure be for the partialpressure of oxygen to be 0.22 atm ?
- Q Rank the following in order of increasing polarity: CH2Cl2,CF2Cl2, CH2Br2, CBr4
- Q Calculate the pH of a solution prepared by mixing a) 25.0 mL of0.512 M NaOH and 34.0 mL of 0.187 M HCl b) 46.0 mL of 0.235 M KOHand 50.0...
- Q 1)Calculate the solubility (in grams per 1.00×102mL of solution)of magnesium hydroxide in a solution buffered at pH = 12.2)How does this compare to the solubility of Mg(OH)2 in purewater?Show work...
- Q Both myoglobin and hemoglobin exhibit cooperative binding tooxygentrue or falseTropocollagen is a double helix of two left handed polypeptidechainstrue or falseF actin is a polymer of G actin monomers and...
- Q Calculate the mass of water produced when 3.8 x 103 grams ofC6H12O6 are reacted with excess oxygen gas (O2). Assume theproducts are those expected for a typical hydrocarbon combustion,CO2 and...
- Q constract the titration curve of pCa versus Volume of EDTA for50.00 ml of 0.00500 M Ca+ titrated with 0.0100 M EDTA in a solutionbuffered to ph 10.0a) in the pre-equivalent...
- Q The pKb values for the dibasic base B are:pKb1= 2.10pKb2= 7.70Calculate the pH at each of the following points in the titrationof 50.0 mL of a 0.75 M B(aq) with...
- Q A solution was prepared by weighing out 6.20 grams of sodiumbenzoate, NaC7H5O2 along with 2.25 grams of benzoic acid, HC7H5O2,and was dissolved in 750.0 mL of water. What is the...
- Q A.) An ideal gaseous reaction (which is a hypothetical gaseousreaction that conforms to the laws governing gas behavior) occursat a constant pressure of 35.0 atm and releases 73.8 kJ of...
- Q write and label the half-reactions for the reduction ofI3- (aq) byS2O32- (aq)
- Q In gluconeogenesis, what are it's thermodynamics and enzymaticregulations?
- Q 1.) Explain why the first derivative of the titration curve canbe used to identify the equivalence point of an acid-base titration(or equivalence points for polyprotic acids).2.)Â Â Explain the effect of pKa...
- Q 63. Ethylene, C2H4, used to make polyethylene plastics, can bemade from ethane, C2H6, one of the components of natural gas. Theheat of reaction for the decomposition of ethane gas into...
- Q Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammoniagas, NH3, according to the equation3H2(g)+N2(g)→2NH3(g)a. How many grams of H2 are needed to produce 11.70 g ofNH3?b. How many...
- Q 1) If the pI for a particular amino acid is 7.5, at which pHwill the net charge on the molecule be zero?2) Calculate the pH of 0.00756 M HNO3.3) The...
- Q what is the purpose of the trap that is used during a vacuumdistillation performed with an aspirator?
- Q experment (Nylon-6,6)1- 5-7 sentences for result .2- 5-7 sentences for the conclusion
- Q two procedures:1. a microscale cis-trans isomerization of an alkene2. a miscroscale addition of bromine to fumaric acidFor each procedure:a. predict which alkene will predominate at equilibrium (pleaseexplain)b. predict the stereochemistry...
- Q 1.) What other D aldohexose gives the same alditol asD-talose?2.) A. The aldaric acid of D-talose is the sameas the aldaric acid of which sugar? (Choices: L-allose, D-altrose,L-galactose, L-glucose, L-gulose,...
- Q Imagine that you are in chemistry lab and need to make 1.00 L ofa solution with a pH of 2.50.You have in front of you100 mL of 7.00×10−2M HCl,100 mL...
- Q The following equation represents the decomposition of a genericdiatomic element in its standard state.1/2 X2 (g) = X (g)Assume that the standard molar Gibbs energy of formation of X(g)is 5.40...
- Q Silver ion, Ag+, can be recovered from photographic solutions byadsorbing onto an ion exchange resin (Langmuir adsorption)Ag+ +Ex↔ Ag-Ex logKL =12.30(where Ex represents an adsorbing site on the resin). Accordingto...
- Q A water initially contains 50mg/L of Mg2+. The pH of the wateris increased until the concentration of hydroxide ion is 0.0005 M.Calculate the concentration (mg/L) of magnesium ion in this...
- Q Determine the molar solubility (S) of Ag2CO3 in a bufferedsolution with a pH of 3.255 using the systematic treatment ofequilibrium. Ksp(Ag2CO3) = 8.46 × 10–12; Ka1(H2CO3) = 4.45 × 10–7;Ka2(H2CO3)...
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