Chemistry concepts and calculations

1. a.) Below is a reaction from a demonstration we did early in the semester in

1. a.) Below is a reaction from a demonstration we did early in the semester in which we put Li(s) into water and saw the pH increase , H 2 (g) evolve , and the reaction catch fir…

1. a.) Lauryl alcohol, C 12 H 25 OH, is prepared from coconut oil and used to ma

1. a.)Lauryl alcohol, C12H25OH, is prepared from coconut oil and used to make sodium lauryl sulfate, a synthetic detergent. What is the molality of lauryl alcohol in a solution of…

1. a.) Would boric acid, B(OH) 3 , be more soluble in ethanol (C 2 H 5 OH) or in

1. a.) Would boric acid, B(OH)3, be more soluble in ethanol (C2H5OH) or in benzene (C6H6)? Explain your answer. b.) Which of the following ions in each pair would be expected to h…

1. acid catalyzed hydrolysis of esters is usually better than base catalyzed hyd

1. acid catalyzed hydrolysis of esters is usually better than base catalyzed hydrolysis. True or False.............2. Borane selectively reduces a carboxylic acid while it leaves …

1. acid catalyzed hydrolysis of esters is usually better than base catalyzed hyd

1. acid catalyzed hydrolysis of esters is usually better than base catalyzed hydrolysis. True or False.............2. Borane selectively reduces a carboxylic acid while it leaves …

1. assume that you weigh 0.4000g of sample that is pure NaCl andsubject it to th

1. assume that you weigh 0.4000g of sample that is pure NaCl andsubject it to the procedure described in this lab. How many molesAg+ added in step                 3(please read at…

1. at 2257 K and 1.00 atm total pressure, water is 1.77 per cent decomposed at e

1. at 2257 K and 1.00 atm total pressure, water is 1.77 per cent decomposed at equilibrium by way of the reaction 2 H20(g) = 2 H2(g) + 02(g). Calculate (a) K, (b) rG, and (c) rG a…

1. at 25 C a saturated solution of a metal hydroxide, M (OH)2, has a pH of 9.0.

1. at 25 C a saturated solution of a metal hydroxide, M (OH)2, has a pH of 9.0. What is the value of the solubility product constant, Ksp, Of M(OH)2 (s) at 25 C? a) 5.0*10-28 b) 1…

1. at 34.9 degrees Celsius, the vapor pressure of ethanol is 115torr. Calculate

1. at 34.9 degrees Celsius, the vapor pressure of ethanol is 115torr. Calculate the temperature (in Celsius) required to increasethe vapor pressure of ethanol to 760 torr, given t…

1. at gure 2 in ONS What does this the ure section. the the layers the separator

1. at gure 2 in ONS What does this the ure section. the the layers the separatory say about the relative densities of the water and the funnel. 2. What gives tea its brownish colo…

1. barium nitrate reacts with magnesium sulfate 2, calcium reacts with water 3.

1. barium nitrate reacts with magnesium sulfate 2, calcium reacts with water 3. ammonium nitrate reacts with sodium carbonate 4. Heptane (C7H16) bums in air Do the following two q…

1. based on the curve shown, what is the value of the equivalence point? 2. how

1. based on the curve shown, what is the value of the equivalence point? 2. how many ml did it require to reach this value? 3. What is the pKa of the acid? 4. Is this an SB/SA, WA…

1. based on the curve shown, what is the value of the equivalence point? 2. how

1. based on the curve shown, what is the value of the equivalence point? 2. how many ml did it require to reach this value? 3. What is the pKa of the acid? 4. Is this an SB/SA, WA…

1. cL, Km and cm3 are metric units that measure the following..? 2. A small flas

1. cL, Km and cm3 are metric units that measure the following..? 2. A small flask weighs 135.75 grams. When is filled completely with ethyl alchol, it weighs 178.07g. When the fla…

1. calculate the heat evolved when 75.0 ml of a 2.00M hcl reacts with 37.5 ml of

1. calculate the heat evolved when 75.0 ml of a 2.00M hcl reacts with 37.5 ml of a 4.00M naoh if the temperature rises from 20.0°c to 37.9°c (remember you are calculating this by …

1. calculate the kilojoules of heat produced by the reaction, assuming that no e

1. calculate the kilojoules of heat produced by the reaction, assuming that no energy left the calorimeter. The specific heat of the solution is 3.96 J/g-°C (include the mass of t…

1. calculate the volume of 0.50 M NaOH needed to saturate 100.0 ml of 0.50 M Zn(

1. calculate the volume of 0.50 M NaOH needed to saturate 100.0 ml of 0.50 M Zn(NO3)2 with Zn(OH)2 2. Assuming a 75% recovery of the volume from the first filtration, what volume …

1. can ice be melted merely by applying pressure? how about dry ice? Explain you

1. can ice be melted merely by applying pressure? how about dry ice? Explain your answers. 2. explain how the solid liquid line in the phase diagram of water differs in character …

1. classify following reactions (from your previous experiments) into one of the

1. classify following reactions (from your previous experiments) into one of the each of the four types listed below: 3Mg (s) + N2(g) --->Mg3N2(s) 2 KClO3(S) ---> 2 KCl(s) +…

1. compare how the three solutions react to the addition of an acid. 2. compare

1. compare how the three solutions react to the addition of an acid. 2. compare how the three solutions react to the addition of a base. 3. compare how the three solutions react t…

1. compare the change in ph when equal volumes of STRONG ACID are added to a mix

1. compare the change in ph when equal volumes of STRONG ACID are added to a mixture of a weak ACID and its conjugate base compared to when added to deionized water. 2. compare th…

1. consider a crystallization of sulfanilamide in which 10ml of hot 95% ethyl al

1. consider a crystallization of sulfanilamide in which 10ml of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanilamide. After the solid has dissolved, the solution is co…

1. consider an aqueous solution that is 0.310M in the salt, potassium benzoate,

1. consider an aqueous solution that is 0.310M in the salt, potassium benzoate, K+ c6h5coo-. ka for benzoic acid , c6h5cooh is 6.5x10^-5 a. what is the initial concentration of th…

1. consider an aqueous solution that is 0.310M in the salt, potassium benzoate,

1. consider an aqueous solution that is 0.310M in the salt, potassium benzoate, K+ c6h5coo-. ka for benzoic acid , c6h5cooh is 6.5x10^-5 a. what is the initial concentration of th…

1. consider the following sequence of integer keys to be hashed into a has table

1. consider the following sequence of integer keys to be hashed into a has table (size is 7) using the hash function H(key)= key module tablesize (or H(key) = key/ tablesize) 11,5…

1. describe 3 properties of good extraction solvents 2. After separating layers

1.describe 3 properties of good extraction solvents 2. After separating layers in an extraction, it is necessary to dry the organic layer with a substance that absorbs water. expl…

1. determine the binding energy per nucleon of an mg-24 nucleus. the mg-24 nucle

1. determine the binding energy per nucleon of an mg-24 nucleus. the mg-24 nucleus has a mass of 24.3056. A proton has a mass of 1.00728 amu, a nuetron has a mass of 1.008665 amu,…

1. during extraction, the ether layer was washed with 2.0 mL saturated aqueous s

1. during extraction, the ether layer was washed with 2.0 mL saturated aqueous sodium chloride. Briefly explain the purpose of this step. 2. Following the saturated, NaCl wash, a …

1. enter the net ionic equation, including phases, for the reaction of AgNO3(aq)

1. enter the net ionic equation, including phases, for the reaction of AgNO3(aq) and KCI(aq). 2. 76.0 mL of a 1.50 M solution is diluted to a total volume of 288 mL. A 144-mL port…

1. explain the difference between heat of neutralization and enthalpy of neutral

1. explain the difference between heat of neutralization and enthalpy of neutralization. 2. You mix 50.0 mL of a weak monoprotic acid with 50.0 mL of NaOH solution in a coffee cup…

1. explain why the elimination reaction in acetone promotes an E2 mechanism whil

1. explain why the elimination reaction in acetone promotes an E2 mechanism while water promotes and E1 mechanism? 2. which product is more thermodynamically stable, the E or Z is…

1. give the name of an amino acid that has a side chain that can form an ionic b

1. give the name of an amino acid that has a side chain that can form an ionic bond with the side chain of aspartic acid. if this is not possible, write"not possible". 2. give the…

1. how is the top loading balances and the analytical balances varied in costruc

1. how is the top loading balances and the analytical balances varied in costruction? 2.why is it important to use the same balance throught the entire experiment? 3. why is the a…

1. how many mL of a 45.0% (m/v) solution of NaCl would you need in order to have

1. how many mL of a 45.0% (m/v) solution of NaCl would you need in order to have 12.0 g of NaCl? 2. A bottle of wine contains 750.0 mL of wine. If the wine is 12.00% (v/v) alcohol…

1. how many millilitersof CHCL3 are needed to prepare a 2.5% v/v solution in 500

1. how many millilitersof CHCL3 are needed to prepare a 2.5% v/v solution in 500 mL ofmethanol? 2.If a 250 mL solution of ethanol in water is prepared with 4mL of absolute ethanol…

1. hown many grams of Mg must react with HCl in order to produce 80.0 mL of hydr

1. hown many grams of Mg must react with HCl in order to produce 80.0 mL of hydrogen gas at STP? 2. when dertermining the pressure of dry hydrogen gas, explain how the measured at…

1. if the recommended adult dose of penicillin is 0.01 g/kg, How many 150 tablet

1. if the recommended adult dose of penicillin is 0.01 g/kg, How many 150 tablets would a 32 Ib child have to take to receive the same dosage 2. Which measurement represents the l…

1. if you had used 1.30 Kearns of barium chloride instead of calcium chloride, a

1. if you had used 1.30 Kearns of barium chloride instead of calcium chloride, and 1.20 grams of the Na2CO3, what would he the theoretical yield of barium carbonate? (Write and ba…

1. in a 1x10-6 M solution of Ba(oH)2. Rank the species in order of most concentr

1. in a 1x10-6 M solution of Ba(oH)2. Rank the species in order of most concentrated to least Ba OH. H20. Hao. Ba(OH) 2. How would you classify the difference in pH of 0.1 M of HN…

1. in this lab you will be mixing hexane with aqueous solution. which layer will

1. in this lab you will be mixing hexane with aqueous solution. which layer will be the water layer top or bottom? Explain what property allows you to determine this. 2. Write a b…

1. in what context do the terms hydrophobic and hydrophilic relate to the soulub

1. in what context do the terms hydrophobic and hydrophilic relate to the soulubilites of substance in water? 2. in each of the following pairs of compounds which compound is like…

1. lodine, , is more soluble in dichloromethane, CH CE, than in water because, A

1. lodine, , is more soluble in dichloromethane, CH CE, than in water because, A Both iodine and dichloromethane have strong ion-dipole interactions. B) The dipole-dipole forces i…

1. mass of covered crucible 2. mass of covered crucible + hydrate 3. mass of cov

1. mass of covered crucible 2. mass of covered crucible + hydrate 3. mass of covered crucible + residue, after heating CALCULATIONS FROM DATA 4. mass of sample (hydrate): (line 2-…

1. message confidentiality 2. message integrity 3. message authentication 4. non

1. message confidentiality 2. message integrity 3. message authentication 4. non-repudiation The 4 services are related in the sense that one services often implies/provides anoth…

1. metal commonly forms +3 ions. it\'s chloride has a molar mass of 162.2 g.mol^

1. metal commonly forms +3 ions. it's chloride has a molar mass of 162.2 g.mol^-1. what is the metal? 2. What is the empirical formula of compound that is 25.9% nitrogen and 74.1%…

1. michaelis menten equation for the chymotrypsin catalysed hydrolysis of peptid

1. michaelis menten equation for the chymotrypsin catalysed hydrolysis of peptide bond is V = Vmax[S]/(Km+[S]) Where Km = K-1+K2/ K1 From the equation of Km it is clear that the M…

1. mix 2.5 Ml cyclohexanone, 7.5g of KMnO4, 65 ml H2o in a round bottom flask. U

1. mix 2.5 Ml cyclohexanone, 7.5g of KMnO4, 65 ml H2o in a round bottom flask. Use steam bath and heat to 30 degree C. 2. Add 1 ml of 3M NaOH solution, stirring with glass rod. Wh…

1. n- butanol has the chemical formula C4H9OH. Since n- butanol has a larger mol

1. n- butanol has the chemical formula C4H9OH. Since n- butanol has a larger molar mass than ethanol, n-butanol: a. will experiment stronger intermolecular forces and have a highe…

1. one difference between friedel-crafts alkylation and acylation is that a stoi

1. one difference between friedel-crafts alkylation and acylation is that a stoichiometric mount of AlCl3 is required for the acylation reaction. Explain 5. predict the reaction p…

1. oxidation reduction reactions a. the zn-cu system oxidation half equation: re

1. oxidation reduction reactions a. the zn-cu system oxidation half equation: reduction half equation: net equation: prediction of spontaneity: comparison of predicted spontaneity…