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After four half-lives of U-238 have passed, how much of this sample is in the original sample? 1/2 1/4 1/8 1/16
Which of the following mixtures has the lower pH. A) Equal volumes of 0.10M HClO4 and 0.10M NaOH. B) Equal volumes of 0.10M HClO4 and 0.10M NH3.
An electron in the ground-state He+ ion undergoes a transition to a state described by the wavefunction R4,1(r)Y1,1(?,). (a) Describe the transition using term symbols. (b) Compute the wavelength, frequency, and wavenumber of the transition.
a student was asked to identify an unknown hydrate by following the procedure described in this module. after heating
Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mole)
you decide to use gel filtration. this works brilliantly and you determine that your protein is 80kda at the same time.
How many kilojoules of energy are required to heat 50.0 g of ethanol from -20.0°C to 68.0°C?
Determine the molecular geometry, or shape, of ClO2 a. octahedral b. tetrahedral c. trigonal bipyramidal d. trigonal planar e. t-shaped f. bent
Assuming 100% dissociation, calculate the freezing point and boiling point of 2.72 m AgNO3(aq).
When would you do a hot filtration. Why do you wash your crystals after you collect them by filtration
Calculate the mass of each microstructure and the mass and composition of each phase within each microstructure. d.) Cool to 726 C. Sketch the morphology. Calculate the mass of each microstructure and the mass and composition of each phase within ..
Determine how much heat is evolved or absorbed when 25.0 of lithium iodide completely dissolves in water. Lithium iodide has a lattice energy of -7.3 X 10^2 kJ/mol and a heat of hydration of -793 kJ/mol.
C5H5N, and 0.350 moles/l in pyridinium chloride, C5H5NHCl you are given a kb value of 1.7 x 10^-4 for pyridine find the ph of this solution using this kb value
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