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What are some of the general properties that distinguish metals from ceramics and polymers?
The reaction 2NO(g) + Cl2 (g) -> 2NOCl(g) is carried out in a closed vessel. If the partial pressure of NO is decreasing at the rate of 21 torr/min, what is the rate of change of the total pressure of the vessel?
question an electron decays from the n 4 orbit to the n 1 orbit in the hydrogen atom. if the work function of
a sample volume of 0.5ml was pipetted into a beaker treated withreagents to produce an indigo color transferred to a
Problem- A 25.0-mL sample of 0.150 M formic acid is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base is added. The Ka of formic acid is 1.8 × 10-4.
Question- Calculate the minimum concentration of Ca2+ that must be added to 0.10 M NaF in order to initiate a precipitate of calcium fluoride.
What is the minimum frequency of light necessary to emit electrons from sodium via the photoelectric effect? What is the wavelength of this light?
Problem- a) A chromatography experiment was carried out using powedered alumina suspended in a pipet and washed out with liquid hexane. A crude organic mixture was put on the column and the various components were washed off the column with hexane..
Problem- When each of the following pairs of aqueous solutions is mixed, does a precipitation reaction occur? If so, write the formula and name of the precipitate.
Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. M(OH)2 (s) M^2+ (aq) + 2OH- (aq) Ksp=2e-16 M(OH)2 (s) + 2OH- (aq) M(OH)4 ^2- (aq) Kf=0.03 Estimate the solubility of M(OH)2 in a solution buffered at pH= 7.0, 10.0, and 1..
Thin-layer chromatograph------Describe how the Rf for a compound will change as the developing solvent is made more polar. What is meant by "developing" a TLC plate. What is meant by "visualization" of a TLC plate
of the solvents used some were very polar e.g. acetone ethanol while others were very nonpolar e.g. hexane. did the
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