Extra Credit: Ritalin (or methylphenidate) has a mechanism of action similar to this other drug we’ve discussed this semester: .

1. A specialized cell type in a specialized environment mediates both auditory and vestibular senses. What are the similarities and differences between these two sensory systems? Your answer should include: (4 pts) i) the frequency ranges covered by the two senses with a mechanistic (physical) explanation for the reasons for the non-overlapping ranges; (4 pts) ii) the mechanical, ionic and synaptic mechanism(s) mediating the transduction of physical forces to afferent action potential frequency; (4 pts) iii) identifying which of the two systems uses cell-based, active amplification, with an explanation of the mechanical, ionic, neuronal and synaptic mechanisms mediating that amplification; and (4 pts) iv) the biochemical mechanisms, including ion channels and other proteins, of adaptation that occurs in this cell type. 2. (4 pts) Sound localization in barn owls relies on two interaural differences. i) What anatomical dimension of the owl’s head determines the sound frequency below which only interaural time differences (ITD) can enable sound localization? and ii) For a large animal (like an elephant), what would you expect that critical frequency to be (higher or lower) compared to that of the owl? Briefly explain.  

Consider the following reaction: 2HI(g)  ⇌   I2(g) +  H2(g) A 10.0L reactor initially containing 2.5mol HI is allowed to reach equilibrium. The equilibrium mixture shows that the concentration of I2 is 0.023M. Build a RICE table and  calculate Kc Enter your answer (3 pts). After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment (2 pts). ⚠️Work required for credit.

This law established the requirement for “full and open competition” means that all responsible sources may submit proposals or bids.

Consider the following equilibrium:            N2(g) + 3 H2(g) ⇌ 2 NH3(g) The following concentrations were measured at equilibrium: [N2] = 0.100 M, [H2] = 0.200 M and [NH3] = 2.36 x 10-1 M for the following reaction at 350oC Calculate the equilibrium constant. Enter your answer (3 pts). After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment (2 pts). ⚠️Work required for credit.

Consider the following reaction: I2(g) +  H2(g)  ⇌   2HI(g) A closed system initially containing 1.00 × 10–3 M H2 and 2.00×10–3 M I2 at 500oC is allowed to reach equilibrium. The equilibrium mixture shows that the concentration of HI is 1.90 × 10–3 M. Build a RICE table and  calculate Kc Enter your answer (3 pts). After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment (2 pts). ⚠️Work required for credit.

The Ka of lactic acid, CH3CH(OH)CO2H, a weak monoprotic acid found in the blood after strenuous exercise, is 1.36 × 10-4. Build a RICE table or write the correct expression for Ka and calculate the pH of 0.222 M solution of lactic acid. Enter your answer (3 pts). After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment (3 pts). ⚠️Work required for credit.  

The Ka of hypochlorous acid (HClO) is 3.00×10-8 Build a RICE table or write the correct expression for Ka and calculate the pH of 0.0200M solution of hypochlorous acid. Enter your answer (3 pts). After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment (3 pts). ⚠️Work required for credit.

Determine the molarity of HI when the following reaction reaches equilibrium. Other equilibrium concentrations are found to be as follows: [HCl] = 1.6 × 10-3 M, [Cl2] = 0.0012 M. The value of Kc for this reaction is 2.8 × 1031. 2HI(g) + Cl2(g) ⇌ 2 HCl(g) + I2(s) Enter your answer. After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment. ⚠️Work required for credit.

The Ka of acetic acid (CH3COOH) is 1.8×10-5 Build a RICE table or write the correct expression for Ka and calculate the pH of 0.70M aqueous solution of acetic acid. Enter your answer (3 pts). After submitting this exam, upload your matching work in the Midterm 2: Required Work, Partial Credit, and Extra Credit assignment (3 pts). ⚠️Work required for credit.