Numerade

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1. Butane. Obtain the difference in energy $ (\Delta \mathrm{E}, \mathrm{kJ} / \mathrm{mol}) $ between gauche and anti forms of butane, and the fraction butane existing in the gauche form as follows: a) Draw butane, adjusting the angle around the central C-C bond so that it is roughly in the anti conformation (methyls at $ 180^{\circ} $ ), then minimise - the MMFF energy is displayed in the box below the minimize button. Rotate by hand to the gauche (methyls at $ 60^{\circ} $ ), minimise again, then calculate $ \Delta \mathrm{E}=\mathrm{E}_{\text {gauche }}-\mathrm{E}_{\text {anti. }} $ [1] \[ \Delta \mathrm{E}=-17.9651-21.2379=-39.203 \mathrm{KJ} / \mathrm{mol} \] b) Use the Boltzmann distribution $ \left(N_{i} / N_{T O T}=\exp \left(-\Delta G_{i} / R T\right)\right) $ to calculate what fraction of butane molecules exist in the gauche form at room temperature (use $ \mathrm{R}=8.314 $, $ \mathrm{T}=300 \mathrm{~K} $ ). Assume that the calculated energy difference $ \Delta \mathrm{E} $ can be used directly in the Boltzmann factor, i.e. $ \Delta \mathrm{E}=\Delta \mathrm{G} $. [1]

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Buss believes that the environment shaped both physical and ____ development. Multiple Choice infant—but only infant— psychological physiological adolescent—but only adolescent—

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Hematocrit (Hct) is a measure of the percentage of whole blood occupied by? Explain

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Which phrase reflects a basic ability available only to a formal operational thinker? "Speaking from experience, I ..." "Hypothetically speaking..." "Realistically speaking ..." "Speaking on behalf of others, I ..."

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Surge pricing allows Uber to increase the supply of drivers when demand is high. Select one: O True O False

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According to Broadbent's Filter Model, the filter identifies physical characteristics of the attended message; this would NOT include: a. the meaning. b. tone of voice. c. speaker's gender d. speaker's accent

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7. In general, "new classical" economists: A. stress the importance of federal budget deficits in economic instability. B. advocate active use of monetary policy to stabilize the economy when it does not self-correct itself when instability occurs. C. emphasize tax cuts as a means of increasing aggregate demand. D. believe that, if left alone, the economy self-corrects instability.

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or antibodies reacting to the body's own cells or 2. The disease causes neuromuscular junctions to not work properly, resulting in weakness. 3. In MS the myelin sheath of nerve fibers deteriorates, causing neuromuscular issues. 4. In CKD kidney disease and eventually death ensue. 5. In RA recurring inflammation in skeletal joints causes pain and a lack of mobility. 1. Autoimmune diseases are usually the result of either molecules.

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Problem 2. (a) Determine the magnitude of force F and the angle \theta that produces a clockwise moment of 800 lb-ft about A. (b) What is the magnitude and direction of the moment created by this force F about B?

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1. The internal energy U, of an amount of gas is given by the equation, U = 0.01PV', where P is in kPa and V¹ is in m³. The gas undergoes a mechanically reversible process from an initial state at 10,000 kPa and 280 K. During the process, V' is constant and equal to 0.3 m³ and P increases by 50%. Determine the values of Q and ?H in kJ for the process. 2. (A) One cubic meter of an ideal gas at 600 K and 1000 kPa expands to 5 times its initial volume through a mechanically reversible, adiabatic process. If $C_P$ = 21 J/mol/K and is temperature independent, find the final temperature, pressure and work done by the gas. (B) If the same change in properties occurs, but via an adiabatic irreversible process in which the expansion is against a restraining pressure of 100 kPa, again calculate the final temperature, pressure and work done by the gas.

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