Chemistry concepts and calculations

1. A solution is saturated in both nitrogen gas and potassium bromide at 75 0 C.

1.       A solution is saturated in both nitrogen gas and potassium bromide at 750C. When the solution is cooled to room temperature, what is most likely to happen? Why? (5 pts) a…

1. A solution of .050 M BaCl 2 and .025 M CaCl 2. K sp of BaSO 4 is 1.1 x 10 -10

1. A solution of .050 M BaCl2 and .025 M CaCl2. Ksp of BaSO4 is 1.1 x 10-10, and Ksp of CaSO4 is 2.4 x 10-5. a. What is the greatest concentration of SO42- that will precipitate o…

1. A solution of a weak acid was tested with the indicators used in this experim

1. A solution of a weak acid was tested with the indicators used in this experiment. The colors observed were as follows:          Methyl Violet          Violet           Thymol B…

1. A solution of ammonia is 2.0% ionized at 25.0 degrees celsius.What was the or

1. A solution of ammonia is 2.0% ionized at 25.0 degrees celsius.What was the original concentration ( in M) of the ammoniasolution? The Kb at 25.0 degrees celsius for ammonia is4…

1. A solution of magnesium hydroxide is prepared by dissolving 361.824 mg of Mg(

1. A solution of magnesium hydroxide is prepared by dissolving 361.824 mg of Mg(OH)2 in 273.5 mL of water. What is the equilibrium concentration of OH- in this solution? For magne…

1. A solution of nitrous acid, HNO2, was prepared by dissolving 1.93 g of HNO2 i

1. A solution of nitrous acid, HNO2, was prepared by dissolving 1.93 g of HNO2 in 500.0 mL of solution. If the equilibrium concentration of H+ in this solution is 7.85 x 10-3 M, w…

1. A solution of the sample to be analyzed has been made in a suitable solvent a

1. A solution of the sample to be analyzed has been made in a suitable solvent and wil l be provided for you. With this solution, a small spot is applied at a distance hear the bo…

1. A solution that contains 50 mg of a colored compound dissolved in 100 mL of a

1. A solution that contains 50 mg of a colored compound dissolved in 100 mL of a solvent absorbs half of the incident light at 500 nm when an aliquot is placed in a cuvette that h…

1. A solution that contains 50 mg of a colored compound dissolved in 100 mL of a

1. A solution that contains 50 mg of a colored compound dissolved in 100 mL of a solvent absorbs half of the incident light at 500 nm when an aliquot is placed in a cuvette that h…

1. A solution was prepared by adding 12.00 mL of 0.130 M KI, 3.00 mL of 0.130 M

1. A solution was prepared by adding 12.00 mL of 0.130 M KI, 3.00 mL of 0.130 M KNO3, 5 mL of 0.0100 M Na2S2O3, 1.00 mL of starch solution, and 15.00 mL of 0.130 M (NHa)2S20s. a. …

1. A standard monitor is the only output device that presents results to the use

1. A standard monitor is the only output device that presents results to the user. True/False Multiple Choices Static 2. ____________ follows closely behind the CPU and memory in …

1. A state has an energy = 76.5×1021 J and a degeneracy of 15. What is the free

1. A state has an energy  = 76.5×1021 J and a degeneracy of 15. What is the free energyof the state at 25C and at 150C? Express your answer in kJ/mol. 2. A molecule has a bond tha…

1. A steam turbine is an important component of an electricity generator. The tu

1. A steam turbine is an important component of an electricity generator. The turbine blade is usually made of nickel. From the following table of EMFs, list three coating materia…

1. A stock phenolphthalein solution was prepared by dissolving 0.050 g in a tota

1. A stock phenolphthalein solution was prepared by dissolving 0.050 g in a total volume of 100.0 ml. You place one drop (0.050 ml) of this stock solution into a flask and dilute …

1. A stock phenolphthalein solution was prepared by dissolving 0.050 g in a tota

1. A stock phenolphthalein solution was prepared by dissolving 0.050 g in a total volume of 100.0 ml. You place one drop (0.050 ml) of this stock solution into a flask and dilute …

1. A stone is thrown into a pond. What happens to the amplitude of the resulting

1. A stone is thrown into a pond. What happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? Explain. 2. An athlete of …

1. A stream flowing at 10.0 m3/sec has a tributary flowing into it at 5 m3/sec,

1. A stream flowing at 10.0 m3/sec has a tributary flowing into it at 5 m3/sec, The ferric chloride concentration above the juncture is 10 mg/l and the tributary concentration is …

1. A student attempted to identify an unknown compound by the method used in thi

1. A student attempted to identify an unknown compound by the method used in this experiment. She found that when she heated a sample weighing 0.5032 g, the mass dropped to 02663 …

1. A student attempts to identify an unknown compound by the method used in this

1. A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5032 g the mass barely changed, dro…

1. A student attempts to identify an unknown compound by the method used in this

1. A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5015 g the mass went down appreciab…

1. A student attempts to identify an unknown compound by the method used in this

1. A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.4862 g the mass barely changed, dro…

1. A student carried out a dehydration experiment using MgSO4. nH20. The student

1. A student carried out a dehydration experiment using MgSO4. nH20. The student placed an evaporating dish which contained 3.8457 g of MgSO4. nH20 in an oven at 110 °C. At this t…

1. A student carried out a dehydration experiment using MgSO4. nH20. The student

1. A student carried out a dehydration experiment using MgSO4. nH20. The student placed an evaporating dish which contained 3.8457 g of MgSO4. nH20 in an oven at 110 °C. At this t…

1. A student carried out a dehydration experiment using MgSO4. nH20. The student

1. A student carried out a dehydration experiment using MgSO4. nH20. The student placed an evaporating dish which contained 3.8457 g of MgSO4. nH20 in an oven at 110 °C. At this t…

1. A student carried out a dehydration experiment using MgSO4. nH20. The student

1. A student carried out a dehydration experiment using MgSO4. nH20. The student placed an evaporating dish which contained 3.8457 g of MgSO4. nH20 in an oven at 110 °C. At this t…

1. A student carried out a simple distillation on a compound known to boil at 12

1. A student carried out a simple distillation on a compound known to boil at 1240C and reported an observed boiling point of 1160-1170C. Gas chromatographic assay of the product …

1. A student claims that a given unknown is a carboxylic acid because the sample

1. A student claims that a given unknown is a carboxylic acid because the sample dissolves in water, 10% NaOH, and 10% NaNCO3. Critique this conclusion. 2. Explain how solubility …

1. A student conducts an investigation to determine the heat of neutralization w

1. A student conducts an investigation to determine the heat of neutralization when 60.0 mL of 0.500 M sulfuric acid is reacted with 50.0 mL of 1.00 M sodium hydroxide. The follow…

1. A student determined percent of cr in a sample of an unknown chloride gravime

1. A student determined percent of cr in a sample of an unknown chloride gravimetrically by He dissolving 0.907 g of solid unknown in water, adding excess of AgNO3 and precipitati…

1. A student determined the absorption spectrum of a 0.1049M standard solution a

1. A student determined the absorption spectrum of a 0.1049M standard solution and then repeated the process for a solution of the same solute but with an unknown concentration (u…

1. A student determined the calorimeter constant of the calorimeter, using the p

1. A student determined the calorimeter constant of the calorimeter, using the procedure described in this module. The student added 50.00 mL of cold water to 50,00 mL of heated d…

1. A student determined the calorimeter constant of the calorimeter, using the p

1. A student determined the calorimeter constant of the calorimeter, using the procedure described in this module. The student added 50.00 mL of cold water to 50.00 ml of heated, …

1. A student determined the calorimeter constant of the calorimeter, using the p

1. A student determined the calorimeter constant of the calorimeter, using the procedure described in this module. The student added 50.00 mL of cold water to 50.00 ml of heated, …

1. A student determined the freezing point of pure t -butyl alcohol by following

1. A student determined the freezing point of pure t-butyl alcohol by following the procedure given in this experiment. Because of an experimental error, the freezing point temper…

1. A student determines the iron(II) content of a solution by first precipitatin

1. A student determines the iron(II) content of a solution by first precipitating it as iron(II) hydroxide, and then decomposing the hydroxide to iron(II) oxide by heating. How ma…

1. A student determines the molar mass of acetone, CHCOCH, by the method used in

1. A student determines the molar mass of acetone, CHCOCH, by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 1.0°…

1. A student has drawn the following thermogram for two different reactions (4 p

1. A student has drawn the following thermogram for two different reactions (4 points) Which thermogram represents an endothermic reaction? two represents a reaction with H -57.2 …

1. A student is asked to standardize a solution of sodium hydroxide . He weighs

1. A student is asked to standardize a solution of sodium hydroxide. He weighs out 1.08 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 20.…

1. A student is given a buffer that contains [HA] and [A- ]. The student is give

1. A student is given a buffer that contains [HA] and [A- ]. The student is given the concentration of [HA] and need to solve for the concentration of [A- ]. Should they titrate w…

1. A student is given a sample of a blue nickel sulfate hydrate. She weighs the

1. A student is given a sample of a blue nickel sulfate hydrate. She weighs the sample in a dry covered cru- cible and obtains a mass of 23.711 g for the crucible, cover, and samp…

1. A student is making up a buffer solution to perform an experiment on an enzym

1. A student is making up a buffer solution to perform an experiment on an enzyme. She starts with an aqueous acetic acid solution in which the following equilibrium is establishe…

1. A student measured the length, width and height of a metal block to be 2.52 i

1. A student measured the length, width and height of a metal block to be 2.52 inches by 3.25 inches by 0.69 inches. The mass was then determined to be 1.051 kg. What is the densi…

1. A student measures the conductivity of an H2CO3 solution and determines it to

1. A student measures the conductivity of an H2CO3 solution and determines it to be a weak electrolyte. The student incorrectly lists the species in solution as H+, CO3-2. Give th…

1. A student measures the potential of a cell made up with 1 M CuSO4 in one solu

1. A student measures the potential of a cell made up with 1 M CuSO4 in one solution reservoir and 1 M ZnSO4 in other. There is a metallic copper (Cu^0) electrode in the CuSO4 and…

1. A student mixes 5.00 mL 2.00 X 10~3 M Fe(NO3)3 with 5.00 mL 2.00 X 10-3 M KSC

1. A student mixes 5.00 mL 2.00 X 10~3 M Fe(NO3)3 with 5.00 mL 2.00 X 10-3 M KSCN. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 1.20 X 10-4 M. Find Kc…

1. A student mixes 5.00 mL 2.00 X 10~3 M Fe(NO3)3 with 5.00 mL 2.00 X 10-3 M KSC

1. A student mixes 5.00 mL 2.00 X 10~3 M Fe(NO3)3 with 5.00 mL 2.00 X 10-3 M KSCN. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 1.20 X 10-4 M. Find Kc…

1. A student mixes 5.00 mL 2.00 X 10~3 M Fe(NO3)3 with 5.00 mL 2.00 X 10-3 M KSC

1. A student mixes 5.00 mL 2.00 X 10~3 M Fe(NO3)3 with 5.00 mL 2.00 X 10-3 M KSCN. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 1.20 X 10-4 M. Find Kc…

1. A student mixes 5.00 mL of 2.00 x 10-3 M Fe(NO3)3 with 5.00 mL of 2.00 x 10-3

1. A student mixes 5.00 mL of 2.00 x 10-3 M Fe(NO3)3 with 5.00 mL of 2.00 x 10-3 M KSCN. She finds that in the equilibrium mixture the of concentration of FeSCN2+ is 1.40 x 10-4 M…

1. A student must prepare 500.0 mL of a solution containing 0.999 g of solid CuS

1. A student must prepare 500.0 mL of a solution containing 0.999 g of solid CuSO Which of the following statements are FALSE regarding the proper procedure to prepare this soluti…

1. A student needs to prepare a solution that is 5:1 of acid to base. The acid c

1. A student needs to prepare a solution that is 5:1 of acid to base. The acid concentration is 0.20M, what should the molarity of the base be to guarantee the 5:1 ratio? 2. You n…