Chemistry concepts and calculations

1) Silver nitrate reacts with barium chloride to form silver chloride and barium

1) Silver nitrate reacts with barium chloride to form silver chloride and barium nitrate a) Write and balance the chemical equation for this reaction b) If 7.5 moles of barium nit…

1) Single-mode optical fiber typically supports transmission over longer distanc

1) Single-mode optical fiber typically supports transmission over longer distances between repeaters than multi-mode optical fiber. a) True b) False 2) A modem converts digital da…

1) Sketch what the Michaelis-Menten hyperbolic plot and the Lineweaver-Burk reci

1) Sketch what the Michaelis-Menten hyperbolic plot and the Lineweaver-Burk reciprocal plot would look like for an enzyme with and without a competitive inhibitor. Plot with and w…

1) Solid ammonium sulfide is slowly added to 75.0mL of a 0.0542M calcium acetate

1) Solid ammonium sulfide is slowly added to 75.0mL of a 0.0542M calcium acetate solution. The concentration of sulfide ion required to just initiate precipitation is _____ M. 2) …

1) Solution # 9 contains 5 mL Fe(NO3)3 and 3mL NaSCN in total volume of 10 mL. P

1) Solution # 9 contains 5 mL Fe(NO3)3 and 3mL NaSCN in total volume of 10 mL. Percent transmittance of the solution is 17.8. 2) A student plots a graph of absorbance on the y axi…

1) Solve the following problems dealing with the periodic table and its elements

1) Solve the following problems dealing with the periodic table and its elements. a) Which letter of the alphabet is the most common first letter in the symbol of the elements? Ho…

1) Sort the phrases pertaining to pure substances and mixtures as either true or

1) Sort the phrases pertaining to pure substances and mixtures as either true or false. Note: If any part of this question is answered incorrectly, a single red X will appear indi…

1) State the purpose of the experiment and background. 2) General description of

1) State the purpose of the experiment and background. 2) General description of the experiment, remember to use past tense. Determination of Sodium percarbonate concentration by …

1) Strong base is dissolved in 675 mL of 0.200 M weak acid (Ka = 4.10 times 10-5

1) Strong base is dissolved in 675 mL of 0.200 M weak acid (Ka = 4.10 times 10-5) to make a buffer with a pH of 4.17. Assume that the volume remains constant when the base is adde…

1) Substance A and B react to form B and C by the following reaction. The initia

1) Substance A and B react to form B and C by the following reaction. The initial rate of reaction is 2.0 M/s. What is the initial rate of change of A, B, C and D? A+3B?2C+3D 2) N…

1) Suggest how a physical string with negligible mass could possibly be used to

1) Suggest how a physical string with negligible mass could possibly be used to help us understand electric or magnetic fields. You can answer this with equations and/or words. Re…

1) Suppose a reaction involve two species, and is first order in the first speci

1) Suppose a reaction involve two species, and is first order in the first species and second order in the second species. In the rate equation, what are the units of the rate con…

1) Suppose that substance A2,B2,C2 are oxidizing agents. You are given the follo

1) Suppose that substance A2,B2,C2 are oxidizing agents. You are given the following facts:A2 is green, B2 is yellow and C2 is red. The three substance undergo reactions in which …

1) Suppose that the diffusion current in a polarogram for reduction of Cd2+ at a

1) Suppose that the diffusion current in a polarogram for reduction of Cd2+ at a mercury electrode is 19 µA. If the solution contains 25 mL of 0.50 mM Cd2+, what percentage of Cd2…

1) Suppose we start with a 1.00 g sample of a radioactive element. After 4.00 ye

1) Suppose we start with a 1.00 g sample of a radioactive element. After 4.00 years, 0.908 g remains. What is the half-life of this element in years? 4.05 3.63 28.80 41.60 4.40 2)…

1) Suppose you have 1 liter of a solution thats 60% hydrogen chloride (HCl), i.e

1) Suppose you have 1 liter of a solution thats 60% hydrogen chloride (HCl), i.e. a 50 % solution of hydrochloric acid. Calculate the amount of pure water you have to add to get t…

1) Suppose you take a shower on a hot day. Describe the sign of the heat that le

1) Suppose you take a shower on a hot day. Describe the sign of the heat that leaves your body as you step out of a warm shower. Next describe the temperature difference inside an…

1) Suppose you were given the job to write a Java class to run a stoplight to co

1) Suppose you were given the job to write a Java class to run a stoplight to control traffic at an intersection. The state of the stoplight is the color of the light currently be…

1) Table A. Standardization of the 0.02 M KMnO 4 solution with Fe(NH 4 ) 2 (SO 4

1) Table A. Standardization of the 0.02 M KMnO4 solution with Fe(NH4)2(SO4)2 · 6H2O. (Molecular weight of the ferrous sulfate hexahydrate is 392.16 g/mol). If you weigh out 1.66 g…

1) Table A. Standardization of the 0.02 M KMnO 4 solution with Fe(NH 4 ) 2 (SO 4

1) Table A. Standardization of the 0.02 M KMnO4 solution with Fe(NH4)2(SO4)2 · 6H2O. (Molecular weight of the ferrous sulfate hexahydrate is 392.16 g/mol). If you weigh out 1.66 g…

1) Telomeres are repetitive sequences at the end of each chromosome required: to

1) Telomeres are repetitive sequences at the end of each chromosome required: to allow for filling of the 3’ overhang at the end of a newly synthesized strand of DNA to facilitate…

1) Tetrachloromethane will be the final product , reaction proceedes by substitu

1) Tetrachloromethane will be the final product , reaction proceedes by substitution. If chlorine would not have been enough then chloromethane, dichloromethane, tri-, tetra- all …

1) The Cannizzaro reaction involves oxidation of an alcohol to a carboxylic acid

1) The Cannizzaro reaction involves oxidation of an alcohol to a carboxylic acid, yet the reaction is achieved with NaOH, which is not an oxidizing agent. Explain why the oxidatio…

1) The Class class is at the top of the Java inheritance hierarchy. Select one:

1) The Class class is at the top of the Java inheritance hierarchy. Select one: True False The Class class is at the top of the Java inheritance hierarchy. Select one: True False …

1) The EPA\'s secondary standards for contaminants that may cause cosmetic or ae

1) The EPA's secondary standards for contaminants that may cause cosmetic or aesthetic effects in drinking water suggest an upper limit of 250 mg/L for sulfate ion. If 2.81×104 li…

1) The EPA\'s secondary standards for contaminants that may cause cosmetic or ae

1) The EPA's secondary standards for contaminants that may cause cosmetic or aesthetic effects in drinking water suggest an upper limit of 250 mg/L for sulfate ion. If 2.81×104 li…

1) The Michaelis-Menten constant Is * O related to the molecular weight of the e

1) The Michaelis-Menten constant Is * O related to the molecular weight of the enzyme O a measure of the resistance of the 0 a reflection of the percentage of O a measure of how t…

1) The Michaelis-Menten constant Is * O related to the molecular weight of the e

1) The Michaelis-Menten constant Is * O related to the molecular weight of the enzyme O a measure of the resistance of the 0 a reflection of the percentage of O a measure of how t…

1) The NO2 cation reacts as an electrophile in this reaction; draw an electron-p

1) The NO2 cation reacts as an electrophile in this reaction; draw an electron-pushing mechanism showing how this cation is formed in situ by reaction of sulfuric acid with nitric…

1) The Reaction has a K c = 1.0*10 -15 at 672 K. At equilibrium, a) Only product

1) The Reaction has a Kc = 1.0*10-15 at 672 K. At equilibrium, a) Only products exist b) only reactants exist c) reactants predominate substantially 2) A 0.10 M solution of HI wil…

1) The Young\'s modulus for steel is 20.7 x 1010 N/m2. How much will a 2 mm diam

1) The Young's modulus for steel is 20.7 x 1010 N/m2. How much will a 2 mm diameter wire, 16 cm long, be strained (answer in meters) when it supports a load of 450 N? 2) A pressur…

1) The ____________________ quantum numbers are associated with the energy of an

1) The ____________________ quantum numbers are associated with the energy of an electron in a many-electron atom? a) l and ml b) n and ml c) n, l, and ml d) n and ms e) n and ml …

1) The absorbance of a 20 mM sample reads 1.5 using a 1 cmcell. What is the mola

1) The absorbance of a 20 mM sample reads 1.5 using a 1 cmcell. What is the molar absorptivity of the sample. 2a) If the sample concentration is reduced by 20%, what is thenew abs…

1) The absorbance of a cationic iron(II) sample solution was measured in a spect

1) The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample …

1) The acid-dissociation constant for benzic acid (C6H5COOH) is 6.3 x 10^-5. Cal

1) The acid-dissociation constant for benzic acid (C6H5COOH) is 6.3 x 10^-5. Calculate the concentrations of H3O+, C6H5COO-, and C6H5COOH in the solution if the initial concentrat…

1) The air in a bicycle tire is bubbled through water and collected at 25°C. If

1) The air in a bicycle tire is bubbled through water and collected at 25°C. If the total volume of gas collected is 5.50 L at a temperature of 25°C and a pressure of 751 torr, ho…

1) The ancient Greek philosophers were probably the first to consider the behavi

1) The ancient Greek philosophers were probably the first to consider the behavior of matter in an organized fashion. Which is the major distinction between the "Greek philosopher…

1) The atomic masses of ^203Tl and ^205Tl are 202.972336 and 204.974410 amu, res

1) The atomic masses of ^203Tl and ^205Tl are 202.972336 and 204.974410 amu, respectively. The average atomic mass of thallium is 204.383 amu. Calculate the natural abundances of …

1) The atomic masses of ^203Tl and ^205Tl are 202.972336 and 204.974410 amu, res

1) The atomic masses of ^203Tl and ^205Tl are 202.972336 and 204.974410 amu, respectively. The average atomic mass of thallium is 204.383 amu. Calculate the natural abundances of …

1) The average atomic mass of naturally occurring silicon is 28.0855 amu. Silico

1) The average atomic mass of naturally occurring silicon is 28.0855 amu. Silicon has three naturally occurring isotopes (Si-28,Si-29 and Si-30). The mass and natural abundance of…

1) The average human body contains 5.70 L of blood with a Fe2+ concentration of

1) The average human body contains 5.70 L of blood with a Fe2+ concentration of 2.60×105 M . If a person ingests 12.0 mL of 16.0 mM NaCN, what percentage of iron(II) in the blood …

1) The balanced chemical equation for the reaction is given as Hg 2 (NO 3 ) 2 (a

1) The balanced chemical equation for the reaction is given as Hg2(NO3)2 (aq) + 2 KCl (aq) ------> 2 KNO3 (aq) + Hg2Cl2(s) The reactants and products except Hg2Cl2 are aqueous …

1) The boiling point of water H 2 O is 100.0 °C at 1 atmosphere. A nonvolatile,

1) The boiling point of water H2O is 100.0°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is glucose . How many grams of glucose, C6H12O6 (180.2 g/mol), …

1) The boiling point of water H 2 O is 100.00 °C at 1 atmosphere. A nonvolatile,

1) The boiling point of water H2O is 100.00°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is urea. If 14.23 grams of urea, CH4N2O (60.10 g/mol), are dis…

1) The boiling point of water/ H 2 O is 100.00 °C at 1 atmosphere. If 14.23 gram

1) The boiling point of water/H2O is 100.00 °C at 1 atmosphere. If 14.23 grams of aluminum acetate, (204.1 g/mol), are dissolved in 293.7 grams of water ...The molality of the sol…

1) The cathode reaction is: ALSO, please choose FROM or TO for the following! In

1) The cathode reaction is: ALSO, please choose FROM or TO for the following! In the external circuit, electrons migrate _____(from/to) the Pb|Pb2+ electrode _____(from/to) the I-…

1) The chemical reaction is as follow Mg(s) + N2(g) + 3O2(g) ---> Mg(NO3)2(s) 2)

1) The chemical reaction is as follow Mg(s) + N2(g) + 3O2(g) ---> Mg(NO3)2(s) 2) rearrange the three data equations to yield the above reaction when added together, the first e…

1) The combustion of ethanol prodces carbon dioxide and water. After 4.62 mL of

1) The combustion of ethanol prodces carbon dioxide and water. After 4.62 mL of ethanol (0.789g/mL) was allowed to burn in the presence of 15.55g of oxygen gas, 3.72mL of water (1…

1) The combustion reaction for benzoic acid C6H5CO2H(s) + 15 2 O2(g) 7 CO2(g) +

1) The combustion reaction for benzoic acid C6H5CO2H(s) + 15 2 O2(g) 7 CO2(g) + 3 H2O() has H 0 = 771.2 kcal/mole. Use Hess’s Law to calculate H0 f for benzoic acid. Answer in uni…

1) The composition of the infant body, in terms of water content (by percent tot

1) The composition of the infant body, in terms of water content (by percent total mass), and fat content (by percent total mass), changes dramatically in the firt year of life. T…