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The age of a rock can be estimated by measuring the amount of 40Ar trapped inside. The calculation is based on the fact that 40K decays to 40Ar by a first-order process. It also assumes that none of the 40Ar produced by the reaction has escaped from the rock since it was formed.
40K + e- ----> 40 Ar K = 5.81E-11 year-1
Calculate the half-life of the radioactive decay.
The masses of the unknown and the solvent (water) were determinded, and the unknown completely dissolved in the water. Just before the jacketed test tube containing the unknown solution was placed in the ice-salt water bath
traditionally foreign direct investments fdi has followed foreign trade since foreign trade is typically less costly
give the structural formula of the organic products formed (if any) when (a) ethanal and (b) propanone are treated with:
Understand how the ability to form hydrogen bonds gives water cohesiveness and how this property is exploited by living things.
You will need two series of standard solutions to calibrate your ion-selective electrodes - one series for sodium and one for calcium.
Aluminum readily displaces hydrogen in sulfuric acid according the following balanced reaction: 2Al(s) + 3H2SO4(aq) = Al2(SO4)3(aq) + 3H2(g). How many moles of Al and how many moles
A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 °C and 90 kPa, find the molecular formula for this compound
Show the reaction mechanism when 2-methyl-2-butanol, sulfuric acid(H2SO4), and water are in a mixture
A 25.0mL sample of HCl solution is titrated with a 0.139 M NaOH solution. The equivalence point is reached with 30.2 mL of base
10 grams of potassium chlorate (KClO3) is heated and decomposed, what mass of oxygen gas will be formed?
compute the change in temperature when 1.8 g of sodium chloride is dissolved in 300.0 ml of water initially at 20c. the
Potassium dichromate can be used to conduct a potentiometric titration of iron II chloride in acidic medium. if 50.0 mL of 0.100 M FeCl2 in 1.00 M HClO4 is titrated with 0.0167 M K2Cr2O7
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