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If you look at the periodic table the light usually have close to a 1:1 ratio of protons to neutrons. Starting with Scandium (atomic#21) they begin to deviate significantly. Now that you understand the idea of nuclear binding energy, explain why the larger atoms need an excess of neutrons compared to protons.
Prepare a 350- to 700-word paper in which you explain the importance of chemistry in your life and in society. Include the following information:
Suppose the exhaust from an automobile contains 1% by volume of carbon monoxide. Make the calculation at 25 degrees celsius at 1 atm. What is the concentration in %
Problem- Calculate the concentrations of all species in a 0.290 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
Xenon gas is released during a certain chemical reaction and pushes back the atmosphere with a change in volume of the vessel (it has a movable piston) from 2 to 20 Liters. Calculate the work done by this release of gas.
Problem- A digital watch battery draws 0.15 milliamperes of current, which is provided by a mercury battery whose net reaction is: HgO(s) + Zn(s) ? ZnO(s) + Hg(l)
Construct a multistep synthetic route from ethylbenzene to (2-bromoethyl)benzene (3 reagants used)
Problem- Part 1) phenyl ethene treated with kmno4, heat, h2o, oh-, and h3o+ would give what major organic product
how much energy is required to heat an iron nail with a mass of 7g from 25 degrees celcius until it becomes red hot at
A compound with empirical formula C 2 H 2 N dissolved its 0.0800 gram in 10.00 g of C 6 H 6 , freezing point of resulting solution= 4.99 degree celsius
Question- Using the recessed bond and protruding bonds, as well as two regular straight-line bonds, draw both mirror images of fluorochlorobromomethane.
Calculate the major product in the Williamson ether synthesis between 1-bromopentane and sodium 1-phenylethoxide. correct stereochemistry of the product must be shown in its with four bonds - with H - at the chirality center.
State the properties of copper that make it suitable to be used as wiring of electrical circuits
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