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A geological sample is found to have a Pb-206/U-238 mass ratio of 0.773/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it? The half-life of U-238 is 4.5 × 109 years.
3.98 × 109 years
1.4 × 1010 years
2.1 × 109 years
7.3 × 1011 years
2.4 × 1010 years
Calculate the mass of TRIS to use when it is mixed with 100 mL of 0.50 M HCl to prepare 1.00 L of buffer of pH=7.40. Also calculate the total concentration of the buffer.
A graduated cylinder contains 152 mL of water. A 14.0 g piece of iron (density = 7.86 rm{g/cm^3}) and a 16.0 g piece of lead are added. What is the new water level in the cylinder?
If a solution contains 28 g of potassium nitrate per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated
43 kg person drinks 410. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work.
Using the Sandmeyer reaction as one step, outline the steps necessary to prepare 4-bromotoluene, 4-iodotoluene, and 4-fluorotoluene from benzene.
a gas mixture of a amp b containing 1.5 mole a and 98.5 mole b is to be contacted by a pure liquid in a packed
How long will it take for the pressure of the helium to equal the pressure of the argon in the container? When the pressure are equal what will the total pressure in the container be
Calculate the pH at the following points (volumes of NaOH added) along the titration curve for leucine. Also, sketch the titration curve for this concentration and volume of leucine with NaOH. a. 0 mL of NaOH added b. 5 mL of NaOH added c. 10 mL o..
At 27°C, a sample of sulfur dioxide (SO2) has a volume of 30.0 mL.
A 3.00-l flask is filled with gaseous ammonia, . The gas pressure measured at 18.0 C is 1.55 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?
What is the basis for signal generation in this technique (i.e., describe how and what signal is measured by the scanning probe electronics)
Strike anywhere matches contain the compound tetraphosphorous trisulfide, which burns to form tetraphosphorus decaoxide and sulfur dioxide gas.
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