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A student is given four solid samples labeled W, X, Y and Z. She is told that the solids could be gold, lead (II) sulfide, silicon dioxide (quartz) and iodine. The results of her investigation are: a) W is a good electrical conductor while X, Y and Z are not b) When the solids are hit with a hammer, W flattens out, X shatters, Y is smashed into a powder and Z is not affected c) When the solids are heated with a Bunsen burner, Y sublimes but X, W and Z do not melt d) In treatment with 6M HNO3, X dissolves but there is no affect on W, Y or Z.
On the basis of these test results, identify the solids. (Show your reasoning)
Based on their activation energies and energy changes and assuming that all collision factors are the same, which of the following reactions would be slowest in the forward direction
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state the radial wave function and radial distribution function of the 3s and 3p states of the hydrogen atom.plot
calculate the ph at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine mw
Problem- Calculate the vibrational contribution to the heat capacity and the total heat capacity for the following molecules (harmonic vibrational frequencies given)
Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH (before any NaOH is added)? What is the pH after 31.9 mL of NaOH are added?
Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the 20.0 mL of HNO3 have been added.
Calculate the value of ?Grxn in a biological cell in which [ATP] = 5.0 mM, [ADP] = 0.40 mM, and [HPO42-] = 5.0 mM. change in G rxn=________kJ/mol
Assuming that radiation with ?=15.0 cm is used, that all the energy is converted to heat, and that 4.184 J is needed to raise the temperature of 1.00 g of water by 1.00 ^0C , how many photons are necessary to raise the temperature of a 350 mL cup ..
Lead metal can be extracted from a mineral called galena, which contains 86.6% lead by mass. A particular ore contains 68.5% galena by mass.
Where did the energy required to maintain the system at a constant temperature in the two isothermal processes described? PAth A- sudden irreversible decrease in pressure from P1 to P2 ( P2
this energy is in the form ofelectromagnetic radiation, what is the frequency of the radiation? Is the radiation emitted orabsorbed?
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