detail? 5 7 uio iwal volüme and (10%) An ideal gas expands from initial volume f
ID: 592637 • Letter: D
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detail? 5 7
uio iwal volüme and (10%) An ideal gas expands from initial volume from Vi to final volume Vr Calculate the changes U, Q and W for the gas (in terms of n, T, V and V). (a) If the expansion is free expansion (b) If the expansion is adiabatic, and starts at temperature To. (c) If the expansion is isothermal at temperature To- 3. (5%) (5%) (5%) 4. Consider a perfect gas contained in a cylinder and separated by a frictionless adiabatic piston into two sections A and B. All changes in B are isothermal; that is, a thermostat surrounds B to keep its temperature constant. There is 2.0 mol of the gas in each section. Initially Ta-1,-300 K, pa = 2.0 L. Heat is added to Section A and the piston moves to the right reversibly until the final volume of Section B is 1.0 L. Calculate ASA and ASB (10%) 5 The chemical shift of the CH3 protons in acetaldehyde (ethanal) is -2.20 and that of the CHO is the difference in local magnetic field between the two regions of the molecule 6. Sketch the form of an AMX NMR spectrum, where A, M, and X are protons with distinctly different Cotton consists of the polymer cellulose, which is a linear chain of glucose molecules. The chains are proton is 9.80. What (10%) when the applied field is (a) 1.5 T, and (b) 15T. chemical shift and JAM>Jax>x held together by hydrogen bonding. When a cotton shirt is ironed, it is first moistened, and then (10%) (1096) heated under pressure. Explain this process. . The diffusion coefficient of CCl4 in heptanes at 25 °C is 3.17x10 m'/s Derive the rate law for the decomposition. of ozone in the feaction 203 302(8) on the basis o the following proposed mechanism: for a CCl4 molecules to have a root mean square displacepment of 5.0 DiJExplanation / Answer
Answer 7- Cotton has hydrogen bonding in between the molecules of glucose and it is a strong force. This leads to electrostatic attractions between the fibre molecules, thus locking them up together and leasing to creases and wrinkles. When clothes are ironed, the heat gives energy to the fibres to settle flat. The moistening of cloth imparts elasticity and acts as a lubricant. When ironed, the moisture evaporates and the clothes are arranged neat.
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