Chemistry concepts and calculations

1) The molarity of CS2 is 16.6 M. What is the density ofCS2? 2) If 20.0 mL of 0.

1) The molarity of CS2 is 16.6 M. What is the density ofCS2? 2) If 20.0 mL of 0.75 M HBr is diluted to a totalvolume of 90.0 mL, what is the molar concentration od the HBrin the r…

1) The most useful ore of aluminum is bauxite, in which Al is present as hydrate

1) The most useful ore of aluminum is bauxite, in which Al is present as hydrated oxides, Al2O3 * xH2O. The number of kilowatt-hours of electricity required to produce 3.00kg of a…

1) The numbers, 1.004 and 1.20, have (a) 4 and 3 and significant figures respect

1) The numbers, 1.004 and 1.20, have (a) 4 and 3 and significant figures respectively. (b) 4 and 2 2 and 4 (d) 1 and 2 2) The width, length, and height of a large, custom-made shi…

1) The numbers, 1.004 and 1.20, have (a) 4 and 3 and significant figures respect

1) The numbers, 1.004 and 1.20, have (a) 4 and 3 and significant figures respectively. (b) 4 and 2 2 and 4 (d) 1 and 2 2) The width, length, and height of a large, custom-made shi…

1) The numbers, 1.004 and 1.20, have.. a ignificant figures respectively (c) 2 a

1) The numbers, 1.004 and 1.20, have.. a ignificant figures respectively (c) 2 and (a) 4 and 3 (b) 4 and 2 (d) 1 and2 2) The width, length, and height of a large, custom-made ship…

1) The numbers, 1.004 and 1.20, have.. a ignificant figures respectively (c) 2 a

1) The numbers, 1.004 and 1.20, have.. a ignificant figures respectively (c) 2 and (a) 4 and 3 (b) 4 and 2 (d) 1 and2 2) The width, length, and height of a large, custom-made ship…

1) The octane rating of gasoline is a relationship of the burning efficiency of

1) The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). like most hydrocarbons, oct…

1) The octane rating of gasoline is a relationship of the burning efficiency of

1) The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). (Figure 1) Like most hydroc…

1) The order of IMFs vary as H-bonding >> dipole-dipole interactions > dispersio

1) The order of IMFs vary as H-bonding >> dipole-dipole interactions > dispersion forces. Ammonia, NH3 molecule can show all the three IMFs; however; (a) H-bonding is the…

1) The pKa for this amino acid\'s side chain is 12.5. At physiological pH (7.4),

1) The pKa for this amino acid's side chain is 12.5. At physiological pH (7.4), the strongest interaction for this side chain is therefore likely to be? a) Charge-charge (ionic) b…

1) The pKa of acetic acid at 25 oC is 4.75. What is the pH of a 10-3 M solution:

1) The pKa of acetic acid at 25 oC is 4.75. What is the pH of a 10-3 M solution: a) at 25 oC, b) at 50 oC? Show your work. (6 pts) 2) Which dissociation would proceed at 25 oC onc…

1) The pOH of a solution is related to pH using the formula pOH = 14.00 pH. If a

1) The pOH of a solution is related to pH using the formula pOH = 14.00 pH. If a solution has a pH of 7.74, what is the pOH at 25oC? 2) If an aqueous solution at 25oC has a hydrox…

1) The pOH of a solution is related to pH using the formula pOH = 14.00 pH. If a

1) The pOH of a solution is related to pH using the formula pOH = 14.00 pH. If a solution has a pH of 7.74, what is the pOH at 25oC? 2) If an aqueous solution at 25oC has a hydrox…

1) The phosphate ion (H3PO4) is a polyprotic acid with the following pKa values:

1) The phosphate ion (H3PO4) is a polyprotic acid with the following pKa values: pK1= 2.15, pK2= 7.2, pK3= 12.4. This buffering system is present in biological systems and is also…

1) The power company is considering installing a new plant using natural gas as

1) The power company is considering installing a new plant using natural gas as fuel to generate the same amount of energy. If the natural gas to be used has an energy capacity of…

1) The predominant isotope of gold, 197 79Au, has an experimentally determined e

1) The predominant isotope of gold, 197 79Au, has an experimentally determined exact mass of 196.967 amu. What is the total nuclear binding energy of gold in electronvolts per ato…

1) The quantity of antimony in a sample can be determined by an oxidation-reduct

1) The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 8.85-g sample of stibnite, an ore of antimony, is dissolve…

1) The radioactive nuclide 172 Ta undergoes first-order decay with a half-life o

1) The radioactive nuclide 172Ta undergoes first-order decay with a half-life of 36.8 min. If a quantity of 172Ta is produced, what fraction remains after 73.0 seconds? Question 3…

1) The rate-temperature relation is explained by the fact that an increase in te

1) The rate-temperature relation is explained by the fact that an increase in temperature is a) causes the volume to increase and collisions to be less frequent, b) causes the act…

1) The reactant concentration in a zero-order reaction was 0.100 M after 125 s a

1) The reactant concentration in a zero-order reaction was 0.100 M after 125 s and 4.00×102 M after 390 s . What is the rate constant for this reaction? Express your answer with t…

1) The reactant concentration in a zero-order reaction was 0.100 M after 125 s a

1) The reactant concentration in a zero-order reaction was 0.100 M after 125 s and 4.00×102 M after 390 s . What is the rate constant for this reaction? Express your answer with t…

1) The reaction I+ OCI.01-+ Cl. was studied in basic aqueous media. The data bel

1) The reaction I+ OCI.01-+ Cl. was studied in basic aqueous media. The data below was collected at 25°C. (None of the solutions initially contained OI or CI.) Initial Composition…

1) The reaction between sucrose and water to produce fructose and glucose is fir

1) The reaction between sucrose and water to produce fructose and glucose is first order overall. The data below shows the change in concentration of sucrose over time at 298 K. T…

1) The reaction for converting 2-phosphoglycerate to phosphoenolpyruvate as carr

1) The reaction for converting 2-phosphoglycerate to phosphoenolpyruvate as carried out by the enzyme enolase is shown in the second line. a) What kind of reaction overall is this…

1) The reaction shown below is an example of an E2 elimination (from Chem 301A).

1) The reaction shown below is an example of an E2 elimination (from Chem 301A). The reaction yields two products. Describe how you would differentiate the products using the list…

1) The reaction shown below is an example of an E2 elimination (from Chem 301A).

1) The reaction shown below is an example of an E2 elimination (from Chem 301A). The reaction yields two products. Describe how you would differentiate the products using the list…

1) The reaction shown below is responsible for creating 14 C in the atmosphere.

1) The reaction shown below is responsible for creating 14C in the atmosphere. What is the bombarding particle? Reaction: 14N + ________ = 14C + 1H proton alpha particle neutron e…

1) The reagent used in the determination of the N-terminal amino acid residue of

1) The reagent used in the determination of the N-terminal amino acid residue of a peptide is? A. carboxypeptidase. B. phenyl isothiocyanate. C. dicyclohexylcarbodiimide. D. ethyl…

1) The sign of ?G for a reaction is ______ if the reaction is spontaneous, _____

1) The sign of ?G for a reaction is ______ if the reaction is spontaneous, ________ if the reaction is at equilibrium, and ________ if the reaction is nonspontaneous. 2) For the r…

1) The small spherical planet called \"Glob\" has a mass of 7.72×10 18 kg and a

1) The small spherical planet called "Glob" has a mass of 7.72×1018 kg and a radius of 6.17×104 m. An astronaut on the surface of Glob throws a rock straight up. The rock reaches …

1) The specific heat of iron at 25* C is 0.107 cal/g. How much heat, in calories

1) The specific heat of iron at 25* C is 0.107 cal/g. How much heat, in calories, does it take to warm 585g of iron from 3.00*C to 37.0*C? 2) A kettle contains 18 gal of tap water…

1) The specific rotation, [] D , for (-)-malic acid is - 27 . What is the observ

1) The specific rotation, []D, for (-)-malic acid is -27. What is the observed rotation for a solution of 1.5 g of (-)-malic acid in 10 mL of water in a sample tube having a pathl…

1) The standard cell potential ( E o cell ) for the voltaic cell based on the re

1) The standard cell potential (Eocell) for the voltaic cell based on the reaction below is _____ V. Sn2+ (aq) + 2Fe3+ (aq) ------> 2Fe2+ (aq) + Sn4+ (aq) A) +0.617 B) +1.39 C)…

1) The standard emf for the cell using the overall cell reaction below is +0.48

1) The standard emf for the cell using the overall cell reaction below is +0.48 V: Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) The emf generated by the cell when [Ni2+] = 2.50 M and [Zn2+] …

1) The standard state (1 bar, 298 K) entropy of helium gas is S o =126 J K -1 mo

1) The standard state (1 bar, 298 K) entropy of helium gas is So=126 J K-1 mol-1. Treat helium as an ideal gas with CVm =3R/2, and calculate delta G (in J) for the reversible expa…

1) The substance diethylamine is a weak nitrogenous base like ammonia. Write a n

1) The substance diethylamine is a weak nitrogenous base like ammonia. Write a net ionic equation to show how diethylamine, (C2H5)2NH, behaves as a base in water. state is its s/l…

1) The table below shows the calibration data for the concentration determinatio

1) The table below shows the calibration data for the concentration determination of a newly developed instrument. Please carry out a linear regression manually based on least-squ…

1) The titration of a 25.0 mL sample of a base requires 23.6 mL of 0.100 M HCl.

1) The titration of a 25.0 mL sample of a base requires 23.6 mL of 0.100 M HCl. What is the concentration of the base assuming that it is mono-protic? 2) The titration of a 50.0 m…

1) The titration of a 25.0 mL sample of a base requires 23.6 mL of 0.100 M HCl.

1) The titration of a 25.0 mL sample of a base requires 23.6 mL of 0.100 M HCl. What is the concentration of the base assuming that it is mono-protic? 2) The titration of a 50.0 m…

1) The two most abundant gases in the atmosphere, N 2 and O 2 , react to a tiny

1)      The two most abundant gases in the atmosphere, N2 and O2, react to a tiny extent at 25oC in the presence of a catalyst. If the partial pressure of O2 is 0.210atm and the p…

1) The value of E o for the reaction A + B C is E o = 0.54V What is the value of

1) The value of Eo for the reaction A + B C is Eo = 0.54V What is the value of Eo for 3C 3A + 3B? 2) Using the reduction potentials table in the notes/book, which of the following…

1) The value of G° at 100.0°C for the formation of calcium chloride from its con

1) The value of G° at 100.0°C for the formation of calcium chloride from its constituent elements: Ca(s) + Cl2(g) CaCl2(s) is ________ kJ/mol. At 25.0°C for this reaction, H° is -…

1) The value of the Solubility Product Constant for lead phosphate is __________

1) The value of the Solubility Product Constant for lead phosphate is ____________ Write the reaction that corresponds to this Ksp value. _______(Aq,S,L) +_______(Aq,S,L) <----…

1) The vapor pressure of liquid heptane , C 7 H 16 , is 40.0 mm Hg at 295 K. A s

1) The vapor pressure of liquid heptane, C7H16, is 40.0 mm Hg at 295 K. A sample of C7H16 is placed in a closed, evacuated container of constant volume at a temperature of 450 K. …

1) There are two compounds of titanium and chlorine. Onecompound contains 31.04%

1) There are two compounds of titanium and chlorine. Onecompound contains 31.04% titanium by mass, and the second contains74.76% chlorine by mass. (a) What are the ratios of titan…

1) There are two naturally occurring types of copper, ^63Cu (62.92960 u) and ^65

1) There are two naturally occurring types of copper, ^63Cu (62.92960 u) and ^65Cu (64.92780 u). a) Given that the atomic weight of copper is 63.546 u, what are the natural abunda…

1) Thirty grams of silicon at 80.0°C is added to 70.0 mL of water at 20.0°C. Cal

1) Thirty grams of silicon at 80.0°C is added to 70.0 mL of water at 20.0°C. Calculate the final temperature after the two substances are mixed together. The specific heat of wate…

1) This series of reactions proceeds predominantly to the right as written. HC2H

1) This series of reactions proceeds predominantly to the right as written. HC2H3O2 + NH3 <===> NH4+ + C2H3O2- HBr + H2O <===> H3O+ + Br - NH4+ + OH- <===> NH3 +…

1) Three compounds that have been used as fuel in cars and racing cars are ethan

1) Three compounds that have been used as fuel in cars and racing cars are ethanol, nitromethane (CH3NO2, H°f = -105.65 kJ/mole), and gasoline. Using octane (H°f = - 208.24 kJ/mol…

1) Three groups of students collected data for three different buffer systems. A

1) Three groups of students collected data for three different buffer systems. All of the groups forgot to write which buffer system they were using in their notebook. a) Assuming…