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Formaldehyde, H2C = O, is known to all biologists because of its usefulness as a tissue preservative. When pure, formaldehyde trimerizes to give trioxane, C3H6O3, which, surprisingly enough, has no
Elemental sulfur occurs as octatomic molecules, S8. What mass of fluorine gas, F2, is needed for complete reaction with 38.5 g sulfur to form sulfur hexafluoride?
The enthalpy of vaporization of chloroform (CHCl3) is 29.4 kJ mol-1 at its normal boiling point of 334.88 K. Calculate (a) the entropy of vaporization of chloroform at this temperature and (b) the
Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 .
Compound A (C6H14) gives three different monochlorides on photochemical chlorination. One of these monochlorides is inert to E2 elimination. The other two monochlorides yield the same alkene B (C6H
Predict the product, if any, of reaction between propanoyl chloride and the following reagents:
What conditions must be present for (a) translational equilibrium and (b) rotational equilibrium of a rigid body? If these conditions for equilibrium are satisfied, is the rigid body necessarily in st
Silver iodide, Agl, is less soluble in aqueous ammonia than either AgBr or AgCl. What two factors could contribute to this result? Explain.
Find the vertices of the image of ΔABC under the translation T-2,5. To what complex number does this correspond?
Explain the dissolution of silver chloride in aqueous ammonia and its reprecipitation in terms of ionic equilibria and solubility product.
Show that in any prism the area of a right section is equal to the product of the base and the sine of the angle between a lateral edge and the base. this relation is used in connection with the re
Explain the fundamental difference between singlet and triplet state. From this fundamental difference explain why phosphorescence takes at least 100,000 times more to occur than fluorescence.
Find the cubed roots of 27i. (So n=3) Answer should be in standard form. Use 27 cis (90 degress), which is the trigonometric from of 27i, to do the problem.
Commercial concentrated aqueous ammonia is 19.7% NH3 by mass. The solution has a density of 0.900 g/mL. Calculate the molarity of the solution, molality of the solution, and mole fraction of NH3.
Write the complex number in trigonometric for r(cos θ + i sin θ), with θ in the interval [00, 3600).
Write the complex number 6(cos 330 degrees + i sin 330 degrees) in rectangular form. Please show all of the work.
Explain, with the help of a suitable clearly-labeled diagram, the difference between molecular fluorescence and phosphorescence. Your explanation should include discussion of the time frames involv
Draw the graph of as a function of and draw the secant lines whose slopes are the average velocities in part (a) and the tangent line whose slope is the instantaneous velocity in part (b).
A triangular pyramid begins with these coordinates:
Assuming perfect conditions exist and continue, how many rabbits are there in 2.5 years (30 months)? What is happening with the population of the rabbits?
The coefficient of static friction between the tires of a car and a horizontal road is µs = 0.6. If the net force on the car is the force of static friction exerted by the road,
Calculate the efficiency of a Carnot engine running between a low temperature of 27.0°C and a high temperature of 387°C. Determine the change in efficiency if you were to
An experiment is performed to determine the percent elongation of electrical conducting material as a function of temperature. The resulting data is listed below. Predict the percent elongation for
Find the initial speed of the cars. How much work did the actor do?
Find the magnitude and direction of the dot's average velocity between f = 0 and I = 2.0 s. Find the magnitude and direction of the instantaneous velocity at t = 0, I = 1.0 s, and 1= 2.0 s.