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1. Define radioactivity decay.
2. What is predictable about radioactive decay? What is unpredictable?
3. Describe how half-life is used to determine the geologic age of a rock.
Carbon dioxide makes up approximately 0.04% of the Earth's atmosphere. If you collect a 2.0L sample from the atmosphere at sea level (1.00 atm) on a warm day
What is the empirical formula of a compound which contains only colbalt and oxygen. if an 8.29 grams sample of the compound contains
a rigid container of o2 has a pressure of 340 kpa at a temperature of 713 k. what is the pressure at 273
How many grams of dry NH4Cl need to be added to 1.60 L of a 0.700 it M solution of ammonia, NH_3, to prepare a buffer solution that has a rm pH of 8.62? K_b for ammonia is 1.8 * 10^{-5}
In the synthesis of t-butyl chloride from t-butyl alcohol, what is the purpose of using concentrated HCl instead of dilute HCl
Suppose you have 5.00 g of powdered magnesium metal, 1.00 L of 2.00 M potassium nitrate solution, and 1.00 L of 2.00 M silver nitrate solution. (a) Which one of the solutions will react with the magnesium powder?
170 mL of an HCl solution with pH of 2.30 is added to 200 mL of an HNO3 solution. The resulting pH is 1.40. What was the pH of the original HNO3 solution
Given: 0.250L of 0.575M Pb(NO3)2 solution mixed with 0.300L of 0.822M NaOH at 25c. Determine if a precipitate forms. Calculated the concentrations to be 0.144 mol of Pb(NO3)2 and 0.247 mol of NaOH. What do I do from here
Experiments have shown that the average frequency of chirping by a snowy tree cricket depends on temperature as shown below. Chirping Rate Temperature
a solution made from 6.50g of an unknown compound in 27.8g of diphenyl has a molality of .195m. Calculate the molar mass of the unknown.
a stock solution of nacl is made taking 150.2g in enough water to make 200.0ml. a 10.00 ml sample of this stock
an industrial chemist puts 1.45 mol each of h2g and co2g in a 1.00-l container at a certain temperature. when
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