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Hulls of ships and, in general, other parts of boats can be protected using a "sacrificial metal". Zinc or magnesium may be used for this purpose. The zinc or magnesium piece is placed in direct contact with the steel hull. Explain the chemical process that protects the hull of the ship.
The student failed to read the barometric pressure at the time of the experiment. When she read the pressure the next day for use in her calculations, it was .50 in. Hg higher thatn it had been during the experiment.
Illustrate that the rate at which shaft work is obtained or needed for a reversible change of state in a closed system at constant entropy as well as pressure is equal to the rate of change of enthalpy of the system.
calculate the concentration of an NaOH solution if 25.0ml of the solution is needed to neutralize 17.5ml of a 0.419M HCL solution
A 4.50 g sample of LiCl at 25 degrees Celsius dissolves in 25.0 mL of water also at 25.0 degrees Celsius. The final equilibrium temperature of the resulting solution is 60.8 degrees Celsius. What is the enthalpy of solution, delta H solution, of L..
Calculate the heat of the reaction. (Use the equation Q = s . m .?T where s is the specific heat, m is the mass of solution and ?T is the change in temperature)
chlorine reacts with pentane to form a varietyof products. draw the mechanism for the formation of 2-chloropentane.
Which is a redox reaction. identify reducing and oxidizing agents. a) CH4 burns in oxygen to produce carbon dioxide and H2O. b) copper metal forms copper (I) oxide on exposure to air. c) iron rusts to form Fe2O3.
A weak acid is placed in a beaker of pure water. At equilibrium, HA has a concentration of .05 M and it conjugate base has a concentration of .01 M, as well as [H3O+]. What is the % ionization? And the Ka value?
A protein may contain several cysteines, which may pair together to form disulfide bonds. If there is an even number n of cysteines, n/2 disulfide boons an form. Explain how many different disulfide pairing arrangements are possible
Ascorbic acid is titrated with 23.1 mL of 0.5 M KIO3. How many moles of ascorbic acid are present?
Calculate the equilibrium constant Kc
Explain how the formation of a soap ‘micelle' helps remove dirt and oil in an aqueous environment.
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