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Compute the escape velocity the minimum initial velocity that will take an object to infinity from the surface of a planet of radius R. Explain what is the value for (a) the Earth, R = 6.37 Mm, g = 9.81 m s-2, (b) Mars, R = 3.38 Mm, mMars/mEarth = 0.108. Explain at what temperatures do H2, He, and O2 molecules have mean speeds equal to their escape speeds? Define what proportion of the molecules has enough speed to escape when the temperature is (a) 240 K, (b) 1500 K? Computations of this kind are very important in considering the composition of planetary atmospheres. Require to know Newton's law of universal gravitation F= Gmm'/ r2, noting that G is different from g. In solving this problem you will need to calculate some integrals that cannot be solved analytically.
Explain how you arrived at this conclusions. Write a balance chemical equation for the reaction that occurs when sodium cyanide dissolves in water.
Show the mechanism for each step of the following reaction scheme- 3-methyl-1-pentene in CH2Cl2 treated with HBr, then NaOH, 1/3 mol equivalent of BH3?tHF and then H2O2/NaOH
for the gas phase reaction 2 no2 f2 -gt 2no2f the rateconstant is 38dm3 mol-1 s-1 at 300 k. the reaction is first
Draw the molecule by placing atoms on the grid and connecting them with bonds. If there is more than one answer, draw all o
Use the octet rule to predict the formula of the simplest compound formed from hydrogen and silicon.
Glucose makes up about 0.10\% by mass of human blood. Calculate the concentration in ppm. Calculate the molality. What further information would you need to determine the molarity of the solution
Decide whether or not each metal dissolves in 1 M HCl. For those metals that do dissolve, write a balanced redox reaction showing what happens when the metal dissolves.
H2SO4, for the first step instead of concentrated HNO3 . What changes will be observed for the initial reaction with copper metal?
Which starting material is the limiting reagent in this procedure? Which reagent is used in excess? How great is the molar excess (how many times greater)?
at 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa/s when 10.0 % had reacted and 7.67 Pa when 20.0 % had reacted.Determine the order of reaction.
World energy supplies are often measured in the unit of quadrillion British thermal units (1012 Btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81 ×1017kJ.
Calculate the number of grams of aluminum required to prepare 500.0g of chromium metal.
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