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Problem 1 (10 pts.) A polypeptide can exist in either helix or random coil forms. The...
just ignore the last sentence 15. The unfolded random-coil peptide SESYINPDGTWTVH can fold into either an...
just ignore the last sentence
15. The unfolded random-coil peptide SESYINPDGTWTVH can fold into either an α-helix structure with a value of ΔΙ folding of-175 kJ/mol or into a β-hairpin structure with a ΔΗ。lding of-199 kJ/mol. What is the value of AHuxy for the helix-to-hairpin conformational transition? Drawing pictures like the one I drew on the first day of class may help.
Proteins are polymers of amino acids that can exist in ordered structures stabilized by a variety...
Proteins are polymers of amino acids that can exist in ordered structures stabilized by a variety of molecular interactions. However, when certain conditions are changed, the compact structure of a polypeptide chain may collapse into a random coil. This structural change may be regarded as a phase transition occurring at a characteristic transition temperature, the melting temperature, Tm, which increases with the strength and number of intermolecular interactions in the chain. A thermodynamic treatment allows predictions to be made of...
Problem 2: (10 pts) A 30-kg iron block at initial temperature 200°C and a 40-kg copper...
Problem 2: (10 pts) A 30-kg iron block at initial temperature 200°C and a 40-kg copper block at initial temperature 100°C are dropped into a very large lake at 20°C. Thermal equilibrium is established after a while as a result of heat transfer between the blocks and lake water. Both blocks have constant specific heats, i.e. Ciron = 0.45 kJ/kg. K and Ccopper = 0.386 kJ/kg. K. Hint: The very large lake can be treated as a heat reservoir and...
All work and answers should be written on your own paper. 1. (6 Pts) Write the...
All work and answers should be written on your own paper. 1. (6 Pts) Write the equilibrium expression, Kc, for the following reactions. a. 2 SO2(g) + O2(g) = 2 SO3(g) b. Cl(g) + O3(g) = CIO(g) + O2(g) c. 4 KO2() + 2 H2O(g) = 4 KOH(s) + 3 O2(g) 2. (6 Pts) Write the equilibrium expression, Kr, for the reactions in problem 1. 3. (8 Pts) At 127°C, Kc = 2.6 x 10- for the reaction: 2 NH3(g)...
1. (14 pts) Consider the following unbalanced gas-phase exothermic reaction, N2 + O2 = NO2 This...
1. (14 pts) Consider the following unbalanced gas-phase exothermic reaction, N2 + O2 = NO2 This is a reaction involved in the production of smog. The heat of formation of NO2 from the elements is A He = 33.18 kJ/mol. This is an endothermic process. The 4, Gof NO2 is 51.31 kJ/mol. a) Balance the reaction. b) Calculate the equilibrium constant at room temperature (300 K). c) If we assume that in our atmosphere the partial pressure of oxygen is...
2.67 When nitroglycerin explodes, the chemical reaction that occurs can be assumed to be CzH5N309(1) =...
2.67 When nitroglycerin explodes, the chemical reaction that occurs can be assumed to be CzH5N309(1) = 3CO2(g) + H2O(g) + {N2(g) + 102(g) (a) Calculate ArHº and AU° for this reaction at 298 K, given that the enthalpy of formation of liquid nitroglycerin is -372.4kJ mol-1.(b) Consider 0.20 mol of nitroglycerin at 25°C completely filling a constant-volume cell of 0.030 L. Calculate the maximum temperature and pressure that would be gener- ated by the explosion of the nitroglycerin if the...
at must be the equilibrium concentration of Question 1 (5 pts). A. If the equilibrium concentration...
at must be the equilibrium concentration of Question 1 (5 pts). A. If the equilibrium concentration of Ce is 0.00010 M, what must be the oqu Cod in the solution? K (Ce (CO)) -59% 10%. (Answer: 3.9 x 10M] B. If the concentration of Ca?" of the solution in 1A is in will some CaCO, begin to precipitate? K (Caco) -1.3 x 10". (Hint: What is the the association of Caland Co, at these concentrations and how does that compare...
1 picture- problem 2 other pictures- phase diagrams for problem 1. Draw a phase diagram for...
1 picture- problem
2 other pictures- phase diagrams for problem
1. Draw a phase diagram for a binary eutectic alloy with solid solubility, naming and describing the significance of the main features. The binary alloy system of metals A and B contains two intermediate (intermetallic) phases A B and AB2 of narrow composition range, each of which forms by a peritectic reaction A cutectic point also exists, at 85at% B. The melting point of A is higher than that of...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
Problem 1 A country (”Home”) is populated with 300 workers who produce either food (F) and/or...
Problem 1
A country (”Home”) is populated with 300 workers who produce
either food (F) and/or clothing (C). Each food worker produces 6
units of food and each clothing worker produces 3 units of
clothing. The preferences of the consumers over food and clothing
are represented by the utility function: u(DF ,
DC) = (DF ) 2/3 (DC)
1/3
1) Assuming that at the optimum, consumers set their marginal
rate of substitution, MRSDF ,DC , to the relative price,
i.e.,...
just ignore the last sentence
15. The unfolded random-coil peptide SESYINPDGTWTVH can fold into either an α-helix structure with a value of ΔΙ folding of-175 kJ/mol or into a β-hairpin structure with a ΔΗ。lding of-199 kJ/mol. What is the value of AHuxy for the helix-to-hairpin conformational transition? Drawing pictures like the one I drew on the first day of class may help.
Proteins are polymers of amino acids that can exist in ordered structures stabilized by a variety of molecular interactions. However, when certain conditions are changed, the compact structure of a polypeptide chain may collapse into a random coil. This structural change may be regarded as a phase transition occurring at a characteristic transition temperature, the melting temperature, Tm, which increases with the strength and number of intermolecular interactions in the chain. A thermodynamic treatment allows predictions to be made of...
Problem 2: (10 pts) A 30-kg iron block at initial temperature 200°C and a 40-kg copper block at initial temperature 100°C are dropped into a very large lake at 20°C. Thermal equilibrium is established after a while as a result of heat transfer between the blocks and lake water. Both blocks have constant specific heats, i.e. Ciron = 0.45 kJ/kg. K and Ccopper = 0.386 kJ/kg. K. Hint: The very large lake can be treated as a heat reservoir and...
All work and answers should be written on your own paper. 1. (6 Pts) Write the equilibrium expression, Kc, for the following reactions. a. 2 SO2(g) + O2(g) = 2 SO3(g) b. Cl(g) + O3(g) = CIO(g) + O2(g) c. 4 KO2() + 2 H2O(g) = 4 KOH(s) + 3 O2(g) 2. (6 Pts) Write the equilibrium expression, Kr, for the reactions in problem 1. 3. (8 Pts) At 127°C, Kc = 2.6 x 10- for the reaction: 2 NH3(g)...
1. (14 pts) Consider the following unbalanced gas-phase exothermic reaction, N2 + O2 = NO2 This is a reaction involved in the production of smog. The heat of formation of NO2 from the elements is A He = 33.18 kJ/mol. This is an endothermic process. The 4, Gof NO2 is 51.31 kJ/mol. a) Balance the reaction. b) Calculate the equilibrium constant at room temperature (300 K). c) If we assume that in our atmosphere the partial pressure of oxygen is...
2.67 When nitroglycerin explodes, the chemical reaction that occurs can be assumed to be CzH5N309(1) = 3CO2(g) + H2O(g) + {N2(g) + 102(g) (a) Calculate ArHº and AU° for this reaction at 298 K, given that the enthalpy of formation of liquid nitroglycerin is -372.4kJ mol-1.(b) Consider 0.20 mol of nitroglycerin at 25°C completely filling a constant-volume cell of 0.030 L. Calculate the maximum temperature and pressure that would be gener- ated by the explosion of the nitroglycerin if the...
at must be the equilibrium concentration of Question 1 (5 pts). A. If the equilibrium concentration of Ce is 0.00010 M, what must be the oqu Cod in the solution? K (Ce (CO)) -59% 10%. (Answer: 3.9 x 10M] B. If the concentration of Ca?" of the solution in 1A is in will some CaCO, begin to precipitate? K (Caco) -1.3 x 10". (Hint: What is the the association of Caland Co, at these concentrations and how does that compare...
1 picture- problem
2 other pictures- phase diagrams for problem
1. Draw a phase diagram for a binary eutectic alloy with solid solubility, naming and describing the significance of the main features. The binary alloy system of metals A and B contains two intermediate (intermetallic) phases A B and AB2 of narrow composition range, each of which forms by a peritectic reaction A cutectic point also exists, at 85at% B. The melting point of A is higher than that of...
.85-120 Thermodynamics Tutorial 3 Problem 1. An inventor claims to have invented 4 engines, each of which operates between constant-temperature reservoirs of 400 and 300 K. Consider the 1st and 2nd laws of thermodynamics to evaluate the engines. For each engine, state and explain why it does or doesn't violate the 1st and 2nd Laws of Thermo. 1st law hint: Think quantity of work. 2nd Law hint: Think process efficiency. Engine 1 2 3 4 QH (J) 200 500 600...
Problem 1
A country (”Home”) is populated with 300 workers who produce
either food (F) and/or clothing (C). Each food worker produces 6
units of food and each clothing worker produces 3 units of
clothing. The preferences of the consumers over food and clothing
are represented by the utility function: u(DF ,
DC) = (DF ) 2/3 (DC)
1/3
1) Assuming that at the optimum, consumers set their marginal
rate of substitution, MRSDF ,DC , to the relative price,
i.e.,...
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