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rebekah tucker

rebekah t.

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An inhibitory postsynaptic potential: A is produced by an increases in permeability of the postsynaptic cell to K+. B occurs when a ligand-gated ion channel opens and allows Cl- ions to flow into the postsynaptic cell C is a small depolarization in a postsynaptic cell. D can be summed with other IPSPs to trigger an action potential in the postsynaptic cell. E is a graded potential

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Ammonium chloride gas has dielectric constant of \( \varepsilon_{r}=1.0083 \) at \( 0^{\circ} \mathrm{C} \) and \( \varepsilon_{r}=1.0049 \) at \( 100^{\circ} \mathrm{C} \). The number of molecules per unit volume is \( 2.7 \times 10^{23} / \mathrm{m}^{3} \) at \( 0^{\circ} \mathrm{C} \). Calculate the permanent dipole moment of the ammonium chloride. (a) \( 2.13 \times 10^{-22} \mathrm{C}-m \) (b) \( 4.12 \times 10^{-27} \mathrm{C}-\mathrm{m} \) (c) \( 6.85 \times 10^{-30} \mathrm{C}-\mathrm{m} \) (d) \( 7.85 \times 10^{-35} \mathrm{C}-\mathrm{m} \)

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CHEM 320 Sept 16 2024 NAME Problem(s) of the Week 3: Due Monday Sept 23rd at the beginning of class (20 pts) Note there is a second problem on the next page. (There will not be an assigned problem next week) 1. A 2.50 g sample of bronze (an alloy which contains copper) was dissolved in sulfuric acid. Cu (s) + 2 H$_2$SO$_4$ (aq) $\rightarrow$ Cu$^{2+}$ (aq) + SO$_4^{2-}$ (aq) + SO$_2$ (g) + 2 H$_2$O (l) The Cu$^{2+}$ formed in the reaction was mixed with KI to form Cul 2Cu$^{2+}$ (aq) + 5I$^-$ (aq) $\rightarrow$ 2Cul (s) + I$_3^-$ (aq) The triiodide (I$_3^-$) formed in this reaction was then titrated with S$_2$O$_3^{2-}$ I$_3^-$ (aq) + 2 S$_2$O$_3^{2-}$ (aq) $\rightarrow$ 3I$^-$ (aq) + S$_4$O$_6^{2-}$ (aq) If 31.5 mL of 1.00 M S$_2$O$_3^{2-}$ solution was consumed in the titration, what was the percent by weight of copper in the original sample of bronze?

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PARIETAL CELLS SECRETE THE HORMONE GASTRIN INTO THE BLOOD IN RESPONSE TO PROTEIN PRODUCTS IN THE STOMACH. O TRUE O FALSE

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You wish to distill 2000 kg moles/hr of a saturated liquid feed. The feed is 0.056 mole fraction propane, 0.321 n- butane, 0.482 n-pentane, and the remainder n-hexane. The column operates at 101.3kPa. The column has a total condenser and a partial reboiler. The reflux ratio is 3.5 and is a saturated liquid. 99.4% recovery of propane is desired in the distillate and 99.7% n-butane in the bottoms. 2.1 Draw a column and label with your knowns. 2.2 Use the DePriester chart to find the order of volatilities and define the light key, heavy key, and non-key(s). 2.3 Write all possible equations and list unknowns (degree of freedom analysis). 2.4 Find the flow rates for D and B, and the molar composition of D and B.

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3. Let f(x) = 3 + 3x - 1. Use the Mean Value Theorem of a continuous function in a closed interval to show that f(x) = 0 only has a root in (-∞, a + b) if f(x) > 3, 4 if x = 3. Find a and b such that f is continuous at 4. 4. Let f(x) = b - ax if x < 3, x = 3. 5. lim x→1-

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(a) Find $\frac{d^2y}{dx^2}$ in terms of $t$ for $x = t^3 + 5t$, $y = t^2$. $\frac{d^2y}{dx^2} = \frac{-6t^2 + 10}{(3t^2 + 5)^2}$

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Graphing Activity Name & Lab Section: Use these data to produce a graph that effectively conveys the information. Then answer the questions below. Time after eating (hours) Blood glucose level in person A (mg/dL) Blood glucose level in person B (mg/dL) 0.5 170 180 1.0 155 195 1.5 140 230 2.0 135 245 2.5 140 235 3.0 135 225 4.0 130 200 What type of graph did you decide to make? Why did you choose that type? What is the independent variable? Why? What is the dependent variable? Why?

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Question 9 9. In the short run, a profit maximizing perfectly competitive firm will always: Obe efficient in allocation Obe efficient in production always have economic profits Obe heavily regulated by the government 10

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2. Determine an expression for the height of the cylinder below, and state any restrictions. [6 marks] $r = \frac{2x^2 - x - 15}{x^2 - 2x - 3}$ $h = ?$ $V = \frac{6\pi x^2 - 17\pi x + 5\pi}{3x^2 + 2x - 1}$

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