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201.0 nm ultraviolet light strikes a metal plate and ejects electrons having kinetic energy E = 3.54 eV. Calculate the binding energy of an electron at the metal surface
An evaluation of R was performed, following the procedure described in this module. The barometric pressure was 736 torr, the temperature was 295 K, and the volume of hydrogen gas collected was 35.6 mL. The calculated value of R was 82.1mL atm K-1..
The drying oven, although thought to be set at 125°C, had an inside temperature of 84°C. How will this error affect the reported percent by mass of the limiting reactant in the salt mixture. too high, too low, or unaffected
How many constitutionally isomeric monochlorides can be formed on free-radical chlorination of 2,3,3-trimethylpentane? trimethylpentane + Cl2 reacted with heat
If an equilibrium constant is much larger than one, it means? A. The position of equilibrium favors the formation products B. The position of equilibrium favors the formation of reactants C
A 2.0*10^-3 M solution of manganese (II) sulfate is gradually made more basic by the addition of a 1.0 M solution. At what pH will manganese (II) hydroxide begin to precipitate? (Ksp = 2* 10^-13
During a work-up, we are asked to interrupt vacuum, "drizzle" cold methanol over the crude product, then reestablish vacuum. What is the purpose of this step and why does the methanol need to be cold
Calculate the pH when 4.73 g of HCOONa is added to 211.0 mL of 0.50 M formic acid, HCOOH. Ignore any changes in volume. The Ka value for HCOOH is 1.8 x 10-4.
Write the Complete Ionic Equation for the reaction between Magnesium Nitrate and Potassium Hydroxide
The OH concentration of 0.45 M ammonia, NH3, is 6.7X10^-4 M write. The reaction equation for its ionization
Completely neutralizes stomach acid (HCl, .10M) How much carbon dioxide is made at STP conditions (37C, 767 torr, 100% humid) by ingesting one 1.834 gram tablet
The _______ of a titration occurs when the indicator changes color.
A typical popcorn kernel has a volume of .250 mL and contains 1.114 mg of water. The kernel will pop at a temperature of 170 C. What is the pressure in atm inside the kernel right before it explodes?
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