Chemistry concepts and calculations

1) a 50 ML solution of NaOH was titrated with 39.7 mL of .9781 M HCL. what is th

1) a 50 ML solution of NaOH was titrated with 39.7 mL of .9781 M HCL. what is the concentration of the NaOH solution 2)Twenty-five ML of .100 M lactic acid (ka=1.4×10^-4) is titra…

1) a 50 ML solution of NaOH was titrated with 39.7 mL of .9781 M HCL. what is th

1) a 50 ML solution of NaOH was titrated with 39.7 mL of .9781 M HCL. what is the concentration of the NaOH solution 2)Twenty-five ML of .100 M lactic acid (ka=1.4×10^-4) is titra…

1) a 50.0 ml sample of a 1.00 M solution of CuSO4 is mixedwith 50.0 ml of 2.00 M

1) a 50.0 ml sample of a 1.00 M solution of CuSO4 is mixedwith 50.0 ml of 2.00 M KOH in a calorimeter. the temperature ofboth solutions was 20.2 C before mixing and 26.3C after mi…

1) a buffer is prepared with 0.15 M CH3COO- and 0.57 M CH3COOH. What is the PH?

1) a buffer is prepared with 0.15 M CH3COO- and 0.57 M CH3COOH. What is the PH? The ka for CH3COOH is 1.75x 10^-5 2) a buffer is prepared with 0.27 M NH4+ and 0.17 M NH3. What is …

1) a compound with a formula weight of 630, consists of 32.79% sodium , 13.02% A

1) a compound with a formula weight of 630, consists of 32.79% sodium , 13.02% Al, and the rest flourine. what is the empirical and molecular formula 2) a compund weighing 5.325 g…

1) a piece of metal weighing 5.10 g at a temperature of 48.6 Cwas placed in a ca

1) a piece of metal weighing 5.10 g at a temperature of 48.6 Cwas placed in a calorimeter into 20.00 ml of water at 22.1 C, andthe final equilibrium temperature was found to be 28…

1) a small amount of the salt C6H5CO2Na (sodium benzoate) is dissolved in water.

1) a small amount of the salt C6H5CO2Na (sodium benzoate) is dissolved in water. the pH of the resutlng solution is 8.6. a) write a balanced equation for the rxn which occurs when…

1) a student who was in a hurry to complete this experiment didn\'t completely d

1) a student who was in a hurry to complete this experiment didn't completely dry the crystalline product before the final weighing. how would this error affect the calculated per…

1) a student who was in a hurry to complete this experiment didn\'t completely d

1) a student who was in a hurry to complete this experiment didn't completely dry the crystalline product before the final weighing. how would this error affect the calculated per…

1) a student who was in a hurry to complete this experiment didn\'t completely d

1) a student who was in a hurry to complete this experiment didn't completely dry the crystalline product before the final weighing. how would this error affect the calculated per…

1) a student who was in a hurry to complete this experiment didn\'t completely d

1) a student who was in a hurry to complete this experiment didn't completely dry the crystalline product before the final weighing. how would this error affect the calculated per…

1) a) In what way can natural gas production cause groundwater pollution? b) Mer

1) a) In what way can natural gas production cause groundwater pollution? b) Mercury is emitted as a result of what energy source? 2) Give an example of one pesticide, what it was…

1) a) In your own words, describe the chemical properties (concepts) that Mendel

1) a) In your own words, describe the chemical properties (concepts) that Mendeleev originally created the periodic table to represent? b) In contrast to the original representati…

1) a) Which of the solvents, ethylacetate (pKa = 21), tetrahydrofuran (pKa = 38)

1) a) Which of the solvents, ethylacetate (pKa = 21), tetrahydrofuran (pKa = 38), or methanol (pKa =16), would be the best choice for a reaction involving the base((CH3)2CH)2NLi (…

1) a) write balanced molecular and net ionic equations for the neutrilization of

1) a) write balanced molecular and net ionic equations for the neutrilization of NaOH by KHP( mol. WT= 204.23). Khp is an abbreviation for potassium hydrogen phthalate, KHC8H4O4,a…

1) a- 27.67; produced b- 27.67; consumed c- 304.0; consumed d- 304.0; produced e

1) a- 27.67; produced b- 27.67; consumed c- 304.0; consumed d- 304.0; produced e- 110.7; consumed 2)   Consider the reaction shown: N2 + O2 ? 2 NO ?H = 43.2 kcal When 50.0 g of N2…

1) a- 27.67; produced b- 27.67; consumed c- 304.0; consumed d- 304.0; produced e

1) a- 27.67; produced b- 27.67; consumed c- 304.0; consumed d- 304.0; produced e- 110.7; consumed 2)   Consider the reaction shown: N2 + O2 ? 2 NO ?H = 43.2 kcal When 50.0 g of N2…

1) a. What is the entropy change if two mole of liquid water is heated from 20 C

1) a. What is the entropy change if two mole of liquid water is heated from 20 C to 100 C under constant pressure? Cp=75.5 J/mol*K over this temperature interval. b. Calculate (de…

1) a. What is the entropy change if two mole of liquid water is heated from 20 C

1) a. What is the entropy change if two mole of liquid water is heated from 20 C to 100 C under constant pressure? Cp=75.5 J/mol*K over this temperature interval. b. Calculate (de…

1) a. What is the flow rate P of brine in kg/h b. What is the total flow of wate

1) a. What is the flow rate P of brine in kg/h b. What is the total flow of water leaving all of the evaporators Wtotal in kg/h c. What is the flow of water W2 in kg/h d. What is …

1) a. What is the molar concentration (i.e., molarity) of sucrose (C12H22O11) if

1) a. What is the molar concentration (i.e., molarity) of sucrose (C12H22O11) if 150.0 g is dissolved in 250.0 mL of solution? b.What is the molar concentration of methanol (CH3OH…

1) a.Combination Reaction: Hydrochloric acid solution and zinc metal b.Decomposi

1) a.Combination Reaction: Hydrochloric acid solution and zinc metal b.Decomposition Reaction: Solid sodium carbonate and carbon dioxide c.Single replacement: lithium metal and wa…

1) all atoms of a given element have the same..... atomic mass? number of neutro

1) all atoms of a given element have the same..... atomic mass? number of neutrons? atomic number? number of nucleons? mass number? 2) nuclei below the belt of stability can raise…

1) and 2) 3) and 4) Note: 0.400g NaCl Conductivity at 12,000 uS/cm Based on your

1) and 2) 3) and 4) Note: 0.400g NaCl Conductivity at 12,000 uS/cm Based on your current understanding, draw molecular-level views of what happens when the following solids are ad…

1) and 2) 3) and 4) Note: 0.400g NaCl Conductivity at 12,000 uS/cm Based on your

1) and 2) 3) and 4) Note: 0.400g NaCl Conductivity at 12,000 uS/cm Based on your current understanding, draw molecular-level views of what happens when the following solids are ad…

1) answer to question #16. I think there are two methyl groups but I am unsure.

1) answer to question #16.  I think there are two methyl groups but I am unsure. 2)how many methylene groups are there?  I think the answer is 1 methylene group 3)based on the H N…

1) based on microwave heating which compound would heat most rapidly A) 1-propan

1) based on microwave heating which compound would heat most rapidly A) 1-propanol b) 1-bromopropane c) hexane 2) based on microwave heating which compound would heat most rapidly…

1) based on microwave heating which compound would heat most rapidly A) 1-propan

1) based on microwave heating which compound would heat most rapidly A) 1-propanol b) 1-bromopropane c) hexane 2) based on microwave heating which compound would heat most rapidly…

1) because lone pair are larger than boding pair, lonepair-lone pair interations

1) because lone pair are larger than boding pair, lonepair-lone pair interations are greater than lone pair-bonding pairinteractions, which are in turn larger than bonding pair-bo…

1) calcium hydroxide, which reacts with carbon dioxide to formcalcium carbonate,

1) calcium hydroxide, which reacts with carbon dioxide to formcalcium carbonate, was used by the anceint romans as mortar instore structure. the reaction for this process is Ca(OH…

1) calculate how long it takes for 201Ti, with half life of 73.0 h, to decrease

1)  calculate how long it takes for 201Ti, with half life of 73.0 h, to decrease from 888 to 111 counts/ minutes 2) calculate the percent(%) by mass of a solution that contains 1.…

1) calculate percent composition of P in Iron(II) phosphate (Fe3(PO4)2). 2) calc

1) calculate percent composition of P in Iron(II) phosphate (Fe3(PO4)2). 2) calculate the wave length in (nm) for electromagnetic radiation that has a frequency equivalent to 9.84…

1) calculate the concentration of H2SO4 for the initial solution from your resul

1) calculate the concentration of H2SO4 for the initial solution from your results for part B and C. which result, B andor C, is likely to be precise. explain? 2) There is an inhe…

1) calculate the density of 0 2 at STP (a) using theideal-gas law and (b) using

1) calculate the density of 02 at STP (a) using theideal-gas law and (b) using the molar volume and molar mass of02. how do the densities compare? 2) consider in firgure 1: a gas …

1) calculate the molar solubility of AgCl at 25C in: a) pure water and b) 2.0 M

1) calculate the molar solubility of AgCl at 25C in: a) pure water and b) 2.0 M NH3 2) calculate the solubility in g/L of AgBr in a) pure water and 0.01 M NaBr. 3) if 2.5 g of cop…

1) can you determine the molecular formula if a substance from its percent compo

1) can you determine the molecular formula if a substance from its percent composition. 2) given that zinc chloride has a formula weight of 136.28amu. what is its formula? 3) Can …

1) compare the results of the benedicts test and iodine-potassium iodide test on

1) compare the results of the benedicts test and iodine-potassium iodide test on hydrolyzed and unhydrolyzed starch solution. Explain 2) explain why sucrose reacts rapdily with se…

1) complete and balance the following: Mg + O2 --- Zn + HCL --- Zn + Cu 2+ ----

1) complete and balance the following:    Mg + O2 ---    Zn + HCL ---    Zn + Cu 2+ ---- 2) balance the following reactions and identify the speciesthat have been oxidized and the…

1) consider the reariaus al the equabrikn lomitant at this a mlinare o S02 with

1) consider the reariaus al the equabrikn lomitant at this a mlinare o S02 with presure atml and 02 a catalyst is afded the follamma reaction take place and the yalem at all macta…

1) could the separation in this experiment have been done in adifferent order? f

1) could the separation in this experiment have been done in adifferent order? for example, if the mixture were the firstextracted with water and then the extract and the insolubl…

1) create a class and write the following methods: a) int firstDigit(int n), ret

1) create a class and write the following methods:                   a) int firstDigit(int n), returning the first digit of the argument                   a) int lasstDigit(int n)…

1) describe how you could determine the specific heat of ametal by using the app

1) describe how you could determine the specific heat of ametal by using the apparatus and technique in this experiment 2) if the specific heat of methanol is 2.51 J/kg, how manyj…

1) formula write the name. If you see a Complete the following naming table. If

1) formula write the name. If you see a Complete the following naming table. If you seea name write the correct formula: (12 pts) Name Name MnO4 HF (g) a( id KBr Barium oxlate Met…

1) from k is the rate of the forward reaction initially greater than or less tha

1) from k is the rate of the forward reaction initially greater than or less than that of the reverse reaction during the kinetic phase? 2)identify how a system will re- establish…

1) give Lewis\'s description of acids and bases. Draw any amine. How does Lewis

1) give Lewis's description of acids and bases. Draw any amine. How does Lewis explain part of this functional group's chemistry. The amine is also the functional group in all the…

1) give Lewis\'s description of acids and bases. Draw any amine. How does Lewis

1) give Lewis's description of acids and bases. Draw any amine. How does Lewis explain part of this functional group's chemistry. The amine is also the functional group in all the…

1) how is comparing the intensity of color of you\'re unknown to the intensity o

1) how is comparing the intensity of color of you're unknown to the intensity of color of the stock solutions related to what the spectrophotometer does? 2) why are using a specif…

1) how many atoms of N are there in 30.0g of NH4NO3? 2) The density of CCL4 (l)

1) how many atoms of N are there in 30.0g of NH4NO3? 2) The density of CCL4 (l) is 1.59g/mL. How many molecules areCCl4 are there in 2.50 L of CCl4? 3) If 1.35 L of diborane gas h…

1) how many miligrans of potassium dichromate heptahydrate are needed to prepare

1) how many miligrans of potassium dichromate heptahydrate are needed to prepare 50 mL of 0.250M aqueous solution that is 2.87 M? describe the procedure for making this solution. …

1) how might the radius affect the electron affinity? 2) how might the Z* affect

1) how might the radius affect the electron affinity? 2) how might the Z* affect the electron affinity? 3) explain the reason for the general trend in electron affinity across a p…