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In carrying out an analysis of a mixture, what do you expect to see when the TLC plate had been allowed to remain in the developing chamber too long, so that the solvent front has reached the top of the plate?
A 6 cm string is fastened at both sides is plucked. What is the wavelength of the n = 3 standing wave? How many nodes does it contain.
The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning 1.00 L of hexane (C6H14, density = 0.660 g/mL) completely, yielding carbon dioxide and water
Arrange the following solutions in order of increasing pH(from lowest to highest) and explain your reasoning. Assume each solution has a concentration of 0.10mol L-1
What are the signs of ΔHvap and ΔSvap for water. Do you expect the signs of these quantities to be the same for other liquids. Explain
Find the temp (in K) above which a reaction with a delta H of 123.0 kj/mol and a delta S of 90.0 J/k*mol becomes spontaneous.
determine the number of carbon atoms in the compound. Natural abundances: 12C is 98.93% and 13C is 1.07%
A particular balloon can be stretched to a maximum surface area of 1257 cm2. The balloon is filled with 3.2L of helium gas at a pressure of 763 torr and a temperature of 291K. The balloon is then allowed to rise in the atmosphere
Glass tempering can be accomplished by both thermal and chemical means. Each puts the near surface region of the glass piece into compression, thereby suppressing growth of surface cracks.
A gaseous system undergoes a change in temperature and volume. What is the entropy change for a particle in this system if the final number of microstates is 0.808 times that of the initial number of microstates
What is the standard heat of reaction for- sugar and ethanol are "burned" to water vapor and carbon dioxide?
When a substance is heated it glows and emits a certain amount of radiant energy that corresponds to particular energies in the electromagnetic spectrum.
In glycogen degradation, what enzyme is responsible for releasing a glucose molecule attached to the main glucose chain at a branch point
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