Chemistry concepts and calculations

4. About the hybrid atomic orbitals it is correct to say that: a. are antibondin

4. About the hybrid atomic orbitals it is correct to say that: a. are antibonding b. are bonding c. they only form sigmay pi links d. they have a defined spatial orientation 9. Ch…

4. Above 882°C, titanium has a BCC crystal structure, with a = 0.332 nm. Below t

4. Above 882°C, titanium has a BCC crystal structure, with a = 0.332 nm. Below this temperture, titanium has a HCP structure, with a = 0.2978 nm and c = 0.4735 nm. Determine the p…

4. Acid-base reaction is a neutralization reaction. If 12.50 mL of 1.20 M NaOH s

4. Acid-base reaction is a neutralization reaction. If 12.50 mL of 1.20 M NaOH solution is used to neutralize 45.25 mL of HNO3 solution, calculate the concentration of the origina…

4. Aerosol cans carry a danger warning about incineration. If an “empty” can has

4. Aerosol cans carry a danger warning about incineration. If an “empty” can has enough gas left inside it to produce just 1 atm of pressure at 25 °C, and the can is heated in a c…

4. All of the equations below are r eactions that have AHm associated with them.

4. All of the equations below are r eactions that have AHm associated with them. Which, if any. also could be used to describe heats of formation? If they don't describe heats of …

4. All of the equations below are reactions that have AHram associated with them

4. All of the equations below are reactions that have AHram associated with them. Which, if any. also could be used to describe heats of formation? If they don't describe heats of…

4. All of the following should be considered in designing a relational database

4. All of the following should be considered in designing a relational database EXCEPT A. compliance with PNPI regulations. B. design for safety with redundant data. C. design you…

4. Aluminum sulfate (A12(S04)3) s an aluminum-based coagulant that is used durin

4. Aluminum sulfate (A12(S04)3) s an aluminum-based coagulant that is used during water and wastewater treatment to enhance removal of solids. You may assume that when aluminum su…

4. An IR spectrum has the following Potentially important absorptions: 3091, 306

4. An IR spectrum has the following Potentially important absorptions: 3091, 3067, 2963, 2921, 2252, 1603, 1499, 1455, 1416, 1078, 1031, 941, 735, 696 cm^ - 1. Indicate which Stru…

4. An average man (mass = 70 kg, specific heat - same as water) produces about 1

4. An average man (mass = 70 kg, specific heat - same as water) produces about 10^4 kJ of heat each day through metabolic activity. i) If he were an isolated system, what would hi…

4. An electron in a H atom can relax (go from an excited state to its ground sta

4. An electron in a H atom can relax (go from an excited state to its ground state) fromn 3 to either n 2 or n-1. Each transition releases a photon. (2 points each) a. Which trans…

4. An inflated balloon has a volume of 6.0 L at sea level (1.0 atm) and is allow

4. An inflated balloon has a volume of 6.0 L at sea level (1.0 atm) and is allowed to ascend until the pressure is 0.45 atm. During the ascent, the temperature drops from 22 °C to…

4. An unknown and constant number of protons are initially at rest and equally s

4. An unknown and constant number of protons are initially at rest and equally spaced along one straight line. That is, the distance between adjacent protons is constant. in case …

4. As a research chemist, you are interested in studying the extent and types of

4. As a research chemist, you are interested in studying the extent and types of interactions in aqueous salt solutions. As part of this study, you weigh three samples of NaCl and…

4. As we discussed in class, entropy can be viewed as measure of information. It

4. As we discussed in class, entropy can be viewed as measure of information. It is thus perhaps not surprising that entropy can be defined for pure data, such as neural spike tra…

4. As we discussed in class, entropy can be viewed as measure of information. It

4. As we discussed in class, entropy can be viewed as measure of information. It is thus perhaps not surprising that entropy can be defined for pure data, such as neural spike tra…

4. Ascorbic acid (Vitamin C) is a mono-anion at neutral pH. It is a powerful ant

4. Ascorbic acid (Vitamin C) is a mono-anion at neutral pH. It is a powerful antioxidant, which scavenges free radicals. It is oxidized in a single-electron oxidation to the mono-…

4. Ascorbic acid (Vitamin C) is a mono-anion at neutral pH. It is a powerful ant

4. Ascorbic acid (Vitamin C) is a mono-anion at neutral pH. It is a powerful antioxidant, which scavenges free radicals. It is oxidized in a single-electron oxidation to the mono-…

4. Assume the Earth is a sphere with radius of 6370 km. (a) If the atmospheric p

4. Assume the Earth is a sphere with radius of 6370 km. (a) If the atmospheric pressure is 1013.25 hPa and the average molecular weight of air is 28.96 kg/kmole, determine the num…

4. Assume you are characterizing an enzyme that catalyzes the following reaction

4. Assume you are characterizing an enzyme that catalyzes the following reaction, A <---->B + C By measuring equilibrium concentrations, you determine that Keq values for th…

4. At 25 °C, the values Keg and ASsurr for dissolving of sodium hydrogen carbona

4. At 25 °C, the values Keg and ASsurr for dissolving of sodium hydrogen carbonate are given: (S points each) K 1042 Use the above information to find the following thermodynamic …

4. At 25 °C, the values Keg and ASsurr for dissolving of sodium hydrogen carbona

4. At 25 °C, the values Keg and ASsurr for dissolving of sodium hydrogen carbonate are given: (S points each) K 1042 Use the above information to find the following thermodynamic …

4. At constant moles and pressure, calculate the effect of doubling the temperat

4. At constant moles and pressure, calculate the effect of doubling the temperature of the gas in 0C on the volume. Start with 1000C 5. Explain, as briefly as possible, how the pa…

4. At least one of the following reactions is not possible. Circle the impossibl

4. At least one of the following reactions is not possible. Circle the impossible reaction(s) and justify your choice. (3 points) a. ethanol and an oxidizing agent producing aceti…

4. Baking soda, sodium bicarbonate, NaHCOat is used to produce a \"rising action

4. Baking soda, sodium bicarbonate, NaHCOat is used to produce a "rising action" in the dough for baked goods. When mixed with an acidic material, such as lemon juice, a gas is gi…

4. Balance the following chemical reactions and then classify each according to

4. Balance the following chemical reactions and then classify each according to reaction type (i.e.: synthesis, decomposition, single/double displacement, etc.) (10 Marks) Type: T…

4. Base titration of glycine. An aqueous solution of glycine (0.1 M, 100 ml, pH

4. Base titration of glycine. An aqueous solution of glycine (0.1 M, 100 ml, pH = 1.72) was titrated with 2M NaOH. The pH was monitored and the results are shown in the graph belo…

4. Before approving your procedure, your advisor also wants to know how sensitiv

4. Before approving your procedure, your advisor also wants to know how sensitive the method is, or the lowest limit of phosphate concentration that can be measured this way. The …

4. Below are data from a calorimetric determination of AHwl for an unknown salt.

4. Below are data from a calorimetric determination of AHwl for an unknown salt. (Refer to part C of the procedure). Caleulate the enthalpy of solution per gram of salt, assuming …

4. Below are data from a calorimetric determination of AHwl for an unknown salt.

4. Below are data from a calorimetric determination of AHwl for an unknown salt. (Refer to part C of the procedure). Caleulate the enthalpy of solution per gram of salt, assuming …

4. Both Mg (H204(OH)2 and A1 (H20)3 (OH)3 can precipitate from solutions which c

4. Both Mg (H204(OH)2 and A1 (H20)3 (OH)3 can precipitate from solutions which con tain the individual cations when 1 M NH3 is added a) If you knew that your unknown solution was …

4. Buffer: A. If you are asked to a 0.1 M buffer of pH-5, which one will you cho

4. Buffer: A. If you are asked to a 0.1 M buffer of pH-5, which one will you chose from the following table?(5 pt) Answer Onionic Acid Table 4-7 Dissociation constant and pK, of s…

4. Buffer: A. If you are asked to a 0.1 M buffer of pH-5, which one will you cho

4. Buffer: A. If you are asked to a 0.1 M buffer of pH-5, which one will you chose from the following table?(5 pt) Answer Onionic Acid Table 4-7 Dissociation constant and pK, of s…

4. CHM 094 Basic Biological Chemistry 35. Which of the following is a type of se

4. CHM 094 Basic Biological Chemistry 35. Which of the following is a type of secondary structure? pleated sheet C. both a and b B.ahelix D. neither a nor b 36. What is the most i…

4. Calculale the number of aoos in the fol greatest number of atoms? 1 mol-622 x

4. Calculale the number of aoos in the fol greatest number of atoms? 1 mol-622 x 1O samples. Which sample contains the atoms a 100 g Pb b. 100 g Fe c. 100g Xe d 10.0g H e. 100 g F…

4. Calculale the number of aoos in the fol greatest number of atoms? 1 mol-622 x

4. Calculale the number of aoos in the fol greatest number of atoms? 1 mol-622 x 1O samples. Which sample contains the atoms a 100 g Pb b. 100 g Fe c. 100g Xe d 10.0g H e. 100 g F…

4. Calculate the density of ammonia gas, NHs, at 27 C and 635 torr mela 1.00 5.

4. Calculate the density of ammonia gas, NHs, at 27 C and 635 torr mela 1.00 5. A 1.00 liter container is evacuated until the pressure is 1.00 x 10 atm at 22°C. How ma molecules o…

4. Calculate the equilibrium concentration of Ag + (aq) in a solution that is in

4. Calculate the equilibrium concentration of Ag+ (aq) in a solution that is initially 0.150 M AgNO3 and 0.500 M KCN. The formation constant for [Ag(CN)2]- (aq) is Kf= 1.0 x 1021 …

4. Calculate the fraction of the appropriate Qn units for the following glasses.

4. Calculate the fraction of the appropriate Qn units for the following glasses. Indicate which types of units are present. Calculate the number of NBO per tetrahedra for the same…

4. Calculate the pH after 0.010 mol of gaseous HCl is added to 250.0 mL of each

4. Calculate the pH after 0.010 mol of gaseous HCl is added to 250.0 mL of each of the following buffered solutions. (Kb for NH3 = 1.76 x 10^5) a. 0.050 M NH3 and 0.15 M NH4Cl b. …

4. Calculate the pH after 0.010 mol of gaseous HCl is added to 250.0 mL of each

4. Calculate the pH after 0.010 mol of gaseous HCl is added to 250.0 mL of each of the following buffered solutions. (Kb for NH3 = 1.76 x 10^5) a. 0.050 M NH3 and 0.15 M NH4Cl b. …

4. Calculate the pH of a solution prepared by mixing 30.00 mL of a 0.15-M KOH so

4. Calculate the pH of a solution prepared by mixing 30.00 mL of a 0.15-M KOH solution with 50.00 mL of a .39-M HBr solution. Ã‚ 5. Ã‚ 45.0 mL of a 0.10-M formic acid (HCHO2, Ka=1…

4. Calculate the pH of the following solutions a. 0.25 M HF (pKa = 3.14) b. 0.65

4. Calculate the pH of the following solutions a. 0.25 M HF (pKa = 3.14) b. 0.65 M CH3NH2 (Kb = 4.38×10-4) c. 0. 50 M NH4Cl (Kb of NH3 = 1.8×10-5) d. 0.35 M NaF (Ka of HF = 7.2×10…

4. Calculate the percent ionization of 7.5×10 3 M butanoic acid ( Ka =1.5×10 5 )

4. Calculate the percent ionization of 7.5×103M butanoic acid (Ka=1.5×105) [A] 2.5 [B] 3.5 [C] 4.5 [D] 5.5 [E] 6.5 5. The Ka of benzoic acid is 6.30 x10-5. The pH of a buffer p…

4. Calculate the standard entropy change for: N 2 (g) + 3 H 2 (g) ® 2 NH 3 (g) a

4. Calculate the standard entropy change for: N2 (g) + 3 H2 (g) ® 2 NH3 (g) at 298 K. S° (J/molK) N2 (g) 210 H2 (g) …

4. Calculate the theoretical number of mL of 0.200 M HCl needed to completely ne

4. Calculate the theoretical number of mL of 0.200 M HCl needed to completely neutralizethe weak base in the 25.0 mL of buffer. From your graph, determine how many mL of 0.200 M H…

4. Calculate the theoretical yield of alum in grams a. First, show how to calcul

4. Calculate the theoretical yield of alum in grams a. First, show how to calculate the formula weight of alum. Be sure to include the mass of the 12 chemically bonded moles of wa…

4. Calculate the total change in work, w, and internal energy, AE, for each of t

4. Calculate the total change in work, w, and internal energy, AE, for each of the following processes For your answers enumerate the results for q, w, and E for each step. 5.00L …

4. Carbon dating is a method that has revolutionized many academic fields. It is

4. Carbon dating is a method that has revolutionized many academic fields. It is based on the fact that a small fraction of the carbon in CO2 and in the bodies of all living creat…

4. Carbon dioxide (CO2) can also bind to heme Heme (aq) + CO2(aq) Heme(CO2) (aq)

4. Carbon dioxide (CO2) can also bind to heme Heme (aq) + CO2(aq) Heme(CO2) (aq) K= .08 Since the binding of O2 to heme is higher than CO2 it can displace the CO2 and result in th…

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