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A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 2,000 counts per minute. What is the half-life of the radioisotope?
considering the reaction where ammonium hydrosulfide nh4hs yields nh3ammonia and hydrogen sulfide h2s an equilibrium
The energy of the C-----C bond id 347 KJ/mol, and that of the Cl------Cl bond is 243 KJ/mol. which of the following values might you expect for the C-----Cl bond energy. Explain.
A complex of correctly written formula [Pt(NH3)3Br]Br·H2O has which set of ligands in its inner coordination sphere. A) 3 NH3 and 2 Br- (B) 3 NH3, 1 Br--, and 1 H2O C) 3 NH3, 2 Br-, and 1 H2O (D) 3 NH3 and 1 Br-
When 35.6 L ammonia and 40.5 L oxygen gas react at STP, NO(g) and water are produced. How many grams of NO(g) are produced assuming 100% yield?
Determine the weight percent of selenium in the soil sample and find the absolute uncertainty in the wt% Se. Report the weight percent and absolute uncertainty with three significant figures.
However, larger colloidal particles cannot pass through the dialyzing membrane. The process of dialysis can be used to separate smaller molecules from larger colloidal particles. NaC1 Solution albumin Solution starch solution
Explain how you would prepare each of the following compounds from benzene: a. phenol b. o-ethyltoulene c. 3-chloroaniline d. p-nitrobenzoic acid
For an alloy that consists of 90.1 g copper, 102 g zinc, and 5.92 g lead, what are the concentrations of (a) Cu (in weight percent), (b) Zn (in weight percent), and (c) Pb (in weight percent). The atomic weights of Cu, Zn, and Pb are 63.54, 65.39,..
a if the electron in a hydrogen atom undergoes a transition from an n 6 level to an n 4 level what is the wavelength
limiting Reactant Worksheet - What are the two steps in the Experimental Procedures that are incorporated to reduce the loss of the calcium oxalate precipitate. Identify the steps in the procedure and the reason for each step.
the acid-dissociation constants of phosphoric acid h3po4 are ka1 7.5 times 10-3 ka2 6.2 times 10-8 and ka3 4.2 times
one reaction that occurs in producing steel from iron ore is thereduction of iron ii oxide by carbon monoxide t give
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