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Titanium (w=6.94x10^-19J) and silicon (w=7.77x10^-19J) surfaces are irradiated with UV radiation with a wavelength of 217nm. What is the wavelength of the electrons emitted by the titanium surface?
What is the % barium in an alloy if it takes 22.0 mL of 0.875M sulfuric acid solution to react with all the barium in a 7.59 g sample of the alloy
The following quantities of trace gases were found in 1 mL sample of air. Calculate the number of moles of each compound in the sample.
If deep ocean water were stored in the laboratory, how would its pH, its alkalinity concentration and it's CO3^-2 concentration change under the following conditions? 1.) At 5C, 1 atm pressure? 2.) At 20C, 1 atm pressure?
If E(ethanol) and E(octane) are the energies per gram of fuel produced by ethanol and octane, respectively, calculations show that E(octane)/E(ethanol) is? [the standard molar enthalpy of formation of octane is -249.9 kJ/mol]
A gas sample has an original volume of 650 ml when collected at 750 mm and 30°C. If a change is made in the gas temperature which causes the volume of the gas sample to become 800 ml at 1.00 atm, what is the new temperature
A student carries out a reaction of Mg with HCl at 20'C and collects 21 cm3 H2 gas measured at a pressure of 751 torr. How many moles does it represent
derive the clayperon equation. what is the primary use in phase diagrams? can you use it to justify the relative slopes
A reactor contains a material that decays at a 0th order date of 0.20mg/L/day at 20 C. If the initial concentration of the material is 100mg/L, how long will it take for the concentration to be reduced to a) 50mg/L, b) 10mg/L, c) 1mg/L
A smple of mixture of NaCl, Caco3 and SiO2 weighed 7.30 grams. During the water wash the sample lost 2.21 grams. After treatment with HCL, the sample weighed 2.05 grams. a. What is the perecent of NaCL by mass in the sample
Organic Chemistry and Genetics Problems - Write an equation for the complete hydrolysis of 2'-deoxythymidine-5'-monophosphate (dTMP) to its component parts.
For an enzyme assay you require a 50 mM Tris-HCl buffer, pH 7.8. How many grams of Tris (mw = 121, pKA = 8.1) and how any ml of 2 M HCl would you require to make 1 L of this buffer
Why can anhydrous NaOH not be used to dry t-amyl chloride instead of calcium chloride and what side products may be produced
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