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Explain the particle in a one dimensional box is sometimes used as a model for pi electrons in a conjugated bond system.
a) Determine the first 3 energy levels for a pi electron in 1, 3 butadiene. Presume a carbon carbon-bond length of 1.25x10-10 m and presume that the box is hard and consists of the three carbon carbon-bonds plus and additional length of 1.39x10-10 m at each end.
how are the empirical and molecular formulas of a compound related? what is the empirical formula of compounds ethyne
Hydrogen gas is bubbled into a solution of barium hydroxide that has sulfur in it. The unbalanced chemical equation for the reaction that takes place is:
a metal m can readily form the m cation. a nonmetal x is a gas at room temperature and can easily form the x- anion.
Fumaric acid, which occurs in many plants, contains 41.4% C, 3.47% H, and 55.1% O by mass. A 0.5 mol sample of this compound has a mass of 58.0 g.
D-maltose is a disaccharide and D means the OH on the second to last carbon to the bottom is on the Right and L means left how do we draw a structure of D-maltose or alpa-D-maltose
the molar mass of corn oil is 890gmole. how many moles and how many grams of sodium hydroxide are required to react
85.0 mL of H2O is initially at room temperature (22. 0C). A chilled steel rod at 2.0 C is placed in the water. If the final temperature of the system is 21. 0C
The activation energy for the diffusion of car- bon in chromium is 111,000 J/mol. Calculate the diffusion coefficient at 1100 K (827??C), given that D at 1400 K (1127??C) is 6.25 ?? 10??11 m2/s.
Dibenzalacetone has two carbon-carbon double bonds. How many geometric isomers are possible? Draw all possible geometric isomers of the product and look up their melting points.
using a sample of a compound containing only oxygen and chlorine reacts with an excess of h2 gas to give 0.206 g
Propanoic acid, HC3H5O2, ionizes in water and has a Ka=1.34x10^-5. What is value of Kb for the propanoate ion
calculate the pH change that takes place when a 100mL of (a) 0.0500M NaOH and (b) 0.0500M HCl is added to 400mL of a buffer solution prepared by mixing 0.200M NH3
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