Chemistry concepts and calculations
117302 questions • Page 393 / 2347
A chemist conducts an experiment to determine the rate of the following reaction
A chemist conducts an experiment to determine the rate of the following reaction: A2 (g) + B2 (g) 2AB (g) If the initial concentration of AB was 0.324 M and the concentration of A…
A chemist designs a galvanic cell that uses these two half-reactions: Answer the
A chemist designs a galvanic cell that uses these two half-reactions: Answer the following questions about this cell. Write a balanced equation for the half-reaction that happens …
A chemist designs a galvanic cell that uses these two half-reactions: half-react
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction MnO4(aq)+2H2O(,)+3e MnO2(s)+4OH (aq) Br2(l)+ 2e- 2 Br-(aq) standard reduction potential Ered = …
A chemist designs a galvanic cell that uses these two half-reactions: half-react
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential MnO2(s)+4 H + (aq)+2e- Mn2+(aq)+ 2H20(,) red = + 1.23 V Zn2+ (aq)+…
A chemist designs a galvanic cell that uses these two half-reactions: half-react
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential .23v rcd Cl,(g)2e 2CI (aq) red Answer the following questions abou…
A chemist does a reaction analysis on the following reaction: 2CO (g) + O2 (g) -
A chemist does a reaction analysis on the following reaction: 2CO (g) + O2 (g) --> 2CO2 (g) She collects the following data: Trial Initial Concentration CO (M) Initial Concentr…
A chemist doesn\'t add a sufficient quantity of barium chloride to reaction with
A chemist doesn't add a sufficient quantity of barium chloride to reaction with and precipitate the sulfate ions. As a result, would the experimental mass percentage of sulfate be…
A chemist forgets to initially dry a test tube to constant mass before dehydrati
A chemist forgets to initially dry a test tube to constant mass before dehydrating an unknown metal sulfate hydrate (assume the remainder of the experiment is performed properly).…
A chemist found a bottle of an unknown concentration of KOH solution sitting on
A chemist found a bottle of an unknown concentration of KOH solution sitting on the shelf in the lab. She found that the pH was 12.0. (a) Is the solution an acid or a base? How do…
A chemist found that a mixture of four components (Compounds A-D) could be separ
A chemist found that a mixture of four components (Compounds A-D) could be separated on a silica gel TLC plate using 10% diethyl ether in hexanes as the eluting solvent (see "orig…
A chemist found that a mixture of four components (Compounds A-D) could be separ
A chemist found that a mixture of four components (Compounds A-D) could be separated on a silica gel TLC plate using 10% diethyl ether in hexanes as the eluting solvent (see "orig…
A chemist introduced 0.027 mol of H 2 , 0.046 mol of I 2 , and 0.55 mol of HI in
A chemist introduced 0.027 mol of H2, 0.046 mol of I2, and 0.55 mol of HI into a 2.0 L container and heated it to 783 K. At this temperature, Kc = 46.0 for the reaction H2(g) + I2…
A chemist is arguing that sampling is not as important as analysis. His concern
A chemist is arguing that sampling is not as important as analysis. His concern is whetherthere is a need for a sampling course in an environmental curriculum. His main rationalei…
A chemist is beginning to prepare 100.0 mL of a solution to be labeled \"0.900%
A chemist is beginning to prepare 100.0 mL of a solution to be labeled "0.900% (wt/vol) sodium chloride." To prepare this solution, the chemist would: Question 4 options: a) weigh…
A chemist is commissioned to produce twenty pallets of aspirin: C_7 H_6 O_3 (sal
A chemist is commissioned to produce twenty pallets of aspirin: C_7 H_6 O_3 (salicylic acid) + C_4 H_6 O_3 (acetic anhydride) rightarrow C_9 H_8 O_4 (aspirin) + C_2 H_4 O_2 (aceti…
A chemist is commissioned to produce twenty pallets of aspirin: C_7H_6O_3 (salic
A chemist is commissioned to produce twenty pallets of aspirin: C_7H_6O_3 (salicylic acid) + C_4H_6O_3 (acetic anhydride) rightarrow C_9H_8O_4 (aspirin) + C_2H_4O_2 (acetic acid) …
A chemist is given a white solid that is suspected of being pure cocaine (molar
A chemist is given a white solid that is suspected of being pure cocaine (molar mass = 303.35 g/mol). When 1.22 g of the solid is dissolved in 15.60 g of benzene the freezing poin…
A chemist is planning to study a chemical equilibrium for which no measured expl
A chemist is planning to study a chemical equilibrium for which no measured explicit thermodynamic values are available. However, the reaction involves common chemical species. Wh…
A chemist is planning to study a chemical equilibrium for which no measured expl
A chemist is planning to study a chemical equilibrium for which no measured explicit thermodynamic values are available. However, the reaction involves common chemical species. Wh…
A chemist is studying the following equilibrium: 2Pb(NO3)2 (s) 2PbO (s) + 4
A chemist is studying the following equilibrium: 2Pb(NO3)2 (s) <--> 2PbO (s) + 4NO2(g) + O2 (g) He starts out with 10 g of Pb(NO3)2 and, at equilibrium, has 2.02 gof PbO. Th…
A chemist is tasked with determining the concentration of nickel for a water sam
A chemist is tasked with determining the concentration of nickel for a water sample drawn from a well next to a nickel mine. To analyze the sample using atomic absorbance spectros…
A chemist lot gets to initially dry a test tube to constant mass before dehydrat
A chemist lot gets to initially dry a test tube to constant mass before dehydrating an unknown metal sulfate hydrate (assume the remainder of the experiment is performed properly)…
A chemist measured the amount of calcium carbonate present in an antacid tablet
A chemist measured the amount of calcium carbonate present in an antacid tablet as follows. The tablet would not dissolve in water, but dissolve completely in 25.0mL of 0.500 M HC…
A chemist measures the energy change AH during the following reaction: 2H2O(l) ?
A chemist measures the energy change AH during the following reaction: 2H2O(l) ?2H2(g)+02(g) &H-572.; kJ Use the information to answer the following questions. 7-10 This react…
A chemist measures the energy change Delta H during the following reaction: 2H_2
A chemist measures the energy change Delta H during the following reaction: 2H_2I(l) rightarrow 2H_2(g) + O_2(g) Delta H = 572. kJ Use the information to answer the following ques…
A chemist measures the energy change DeltaH during the following reaction: 2NH3(
A chemist measures the energy change DeltaH during the following reaction: 2NH3(g) --> N2(g) + 3H2(g) DeltaH = 160. kJ A) Is the reaction ENDOthermic or EXOthermic? I chose END…
A chemist measures the enthalpy change H during the following reaction: C6H12O6
A chemist measures the enthalpy change H during the following reaction: C6H12O6 3CH4 + 3CO2 =H132.kJ Use this information to complete the table below. Round each of your answers…
A chemist must dilute 78. 9ml of 1.21m M aqueous magnesium fluoride solution unt
A chemist must dilute 78. 9ml of 1.21m M aqueous magnesium fluoride solution until the concentration falls to 1.00m M . He'll do this by adding distilled water to the solution unt…
A chemist must prepare 400.0 mL of hydrobromic acid solution with a pH of 0.90 a
A chemist must prepare 400.0 mL of hydrobromic acid solution with a pH of 0.90 at 25 °C He will do this in three steps: Fill a 400.0 mL volumetric flask about halfway with distill…
A chemist must prepare 60o.o mL of potassium hydroxide solution with a pH of 12.
A chemist must prepare 60o.o mL of potassium hydroxide solution with a pH of 12. O at 25 "e do thi n th Fall a 600.0 mL volumetric flask about halfway with distilled water. weigh …
A chemist needed some potassium nitrate, KNO3, for an experiment. Because there
A chemist needed some potassium nitrate, KNO3, for an experiment. Because there was none in her laboratory, she decided to make it from potassium iodide, KI and sodium nitrate, Na…
A chemist needs a pH 3.5 buffer. Should she use NaOH withformic acid (ka=1.8x10^
A chemist needs a pH 3.5 buffer. Should she use NaOH withformic acid (ka=1.8x10^-4) or with acetic acid (ka=1.8x10^-5)? why?What is the disadvantage of using the other acid? What …
A chemist needs to create a series of standard Cu2 (aq) solutions for an absorba
A chemist needs to create a series of standard Cu2 (aq) solutions for an absorbance experiment. For the first standard, he uses a pipet to transfer 20.00 mL of a 2.80 M Cu2 (aq) s…
A chemist needs to create a series of standard Cu2 (aq) solutions for an absorba
A chemist needs to create a series of standard Cu2 (aq) solutions for an absorbance experiment. For the first standard, he uses a pipet to transfer 10.00 mL of a 2.49 M Cu2 (aq) s…
A chemist needs to create a series of standard Cu^2+(aq) solutions for an absorb
A chemist needs to create a series of standard Cu^2+(aq) solutions for an absorbance experiment. For the first standard, he uses a pipet to transfer 10.00 mL of a 2.36 M Cu^2+(aq)…
A chemist needs to determine the concentration of a solution of nitric acid, HNO
A chemist needs to determine the concentration of a solution of nitric acid, HNO3. She puts 835 mL of the acid in a flask along with a few drops of indicator. She then slowly adds…
A chemist needs to determine the concentration of a solution of nitric acid, HNO
A chemist needs to determine the concentration of a solution of nitric acid, HNO_3. She puts 865 mL of the acid in a flask along with a few drops of indicator. She then slowly add…
A chemist needs to determine the concentration of a solution of nitric acid, HNO
A chemist needs to determine the concentration of a solution of nitric acid, HNO_3. She puts 865 mL of the acid in a flask along with a few drops of indicator. She then slowly add…
A chemist observed a gas being evolved in a chemical reaction and collected some
A chemist observed a gas being evolved in a chemical reaction and collected some of it for analysis. It contains 80% C and 20% H. It was also observe that 500 ml. of the gas at 0 …
A chemist observed a gas being evolved in a chemical reaction and collected some
A chemist observed a gas being evolved in a chemical reaction and collected some of it for analysis. It contains 80% C and 20% H. It was also observe that 500 ml. of the gas at 0 …
A chemist obtains 500.0 mL of a solution containing an unknown concentration of
A chemist obtains 500.0 mL of a solution containing an unknown concentration of calcium iodide. Cal_2- He pipets 20 mL of this solution into a 100 mL volumetric flask and dilutes …
A chemist obtains 500.0 mL of a solution containing an unknown concentration of
A chemist obtains 500.0 mL of a solution containing an unknown concentration of calcium iodide, CaI2. He pipets 15 mL of this solution into a 100 mL volumetric flask and dilutes t…
A chemist performed a reaction between a phenylmagnesium bromide, (0.571 g) and
A chemist performed a reaction between a phenylmagnesium bromide, (0.571 g) and benzophenone 0.4997 g. The acidified product of the reaction, ("product"), was extracted with other…
A chemist performed a titration experiment in order to determine the concentrati
A chemist performed a titration experiment in order to determine the concentration of a given aqueous solution of HCl (an acid). She pipeted 20.00 mL of the HCl solution into an E…
A chemist performed the reaction shown below. He then wanted to separate the mix
A chemist performed the reaction shown below. He then wanted to separate the mixture using column chromatography. In his protocol he used silica as the stationary phase and a mixt…
A chemist performed the reaction shown below. He then wanted to separate the mix
A chemist performed the reaction shown below. He then wanted to separate the mixture using column chromatography. In his protocol he used silica as the stationary phase and a mixt…
A chemist performed the reaction shown below. He then wanted to separate the mix
A chemist performed the reaction shown below. He then wanted to separate the mixture using column chromatography. In his protocol he used silica as the stationary phase and a mixt…
A chemist places 1.4142 g of Na 2 SO 4 in a 100 mL volumetric flask and adds wat
A chemist places 1.4142 g of Na2SO4 in a 100 mL volumetric flask and adds water to the mark. She then pipets 20 mL of the resulting solution into a 50 mL volumetric flask and adds…
A chemist places 2.1041 g of Na2SO4 in a 100 mL volumetric flask and adds water
A chemist places 2.1041 g of Na2SO4 in a 100 mL volumetric flask and adds water to the mark. She then pipets 10 mL of the resulting solution into a 50 mL volumetric flask and adds…
A chemist places 2.1041 g of Na2SO4 in a 100 mL volumetric flask and adds water
A chemist places 2.1041 g of Na2SO4 in a 100 mL volumetric flask and adds water to the mark. She then pipets 10 mL of the resulting solution into a 50 mL volumetric flask and adds…
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