OC userin Chemistry·6 Dec 201793. Write equations for the half-reactions that occur in the electrol- ysis of a mixture of molten potassium bromide and molten lith- ium bromide.
OC userin Chemistry·4 Dec 201797. The desorption (leaving of the surface) of a single molecular layer of n-butane from a single crystal of aluminum oxide is found to be first order with a rate constant of 0.128/s at 150 K. a. What is the half-life of the desorption reaction? b. If the surface is initially completely covered with n-butane at 150 K, how long will it take for 25% of the molecules to desorb (leave the surface)? For 50% to desorb? c. If the surface is initially completely covered, what fraction will remain covered after 10 s? After 20 s?
OC userin Chemistry·4 Dec 2017102. What mass of aluminum metal can be produced per hour in the electrolysis of a molten aluminum salt by a current of 25 A?
OC userin Chemistry·1 Dec 20171. What is Brownian motion? How is it related to the development of the idea that matter is particulate?
OC userin Chemistry·30 Nov 2017109. Consider the stack of pennies in the previous problem. How much money in dollars) would this represent? If this money were equally distributed among the world's population of 7.0 billion people, how much would each person receive? Would each per son be a millionaire? A billionaire? A trillionaire?
OC userin Chemistry·2 Dec 201793. Determine whether the two structures are isomers or the same molecule drawn in two different ways. a. CH3-CH=C0–CH, | CHG-0–0–CH3–CH, C. CH3-HC-CH-CH3 CH3 CH3 CH3 CHI-HC-CH=CH, CH3
OC userin Chemistry·29 Nov 201742. Which statements are inconsistent with Rutherford's nuclear theory as it was originally stated? Why? a. Since electrons are smaller than protons, and since a hydro- gen atom contains only one proton and one electron, it must follow that the volume of a hydrogen atom is mostly due to the proton. b. A nitrogen atom has seven protons in its nucleus and seven electrons outside of its nucleus. c. A phosphorus atom has 15 protons in its nucleus and 150 electrons outside of its nucleus. d. The majority of the mass of a fluorine atom is due to its nine electrons.
OC userin Chemistry·28 Nov 2017110. Which is more efficient, a butane lighter or an electric lighter (such as the ones traditionally found on the dashboard of auto- mobiles)? Explain.
OC userin Chemistry·28 Nov 201717. In a reaction mechanism, what is an elementary step? Write down the three most common elementary steps and the corre- sponding rate law for each one.
OC userin Chemistry·29 Nov 2017Q6. A reaction has AHpx = -255 kJ and ASix = 211J/K. Calculate AG xn at 55 °C. a) 11.9 X 10 kJ b) 69.5 X 10 kJ c) -267 kJ d) -324 kJ
OC userin Chemistry·25 Nov 201766. Determine whether each transition in the hydrogen atom corresponds to absorption or emission of energy. a. n-3-on=1 b. n = 22n = 4 C. n = 4 n = 3
OC userin Chemistry·27 Nov 2017Q1. Which property of carbon is related to its ability to form a large number of compounds? a) its tendency to form four covalent bonds b) its ability to form double and triple bonds c) its tendency to catenate d) all of the above