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Some watch dials are coated with a phosphor, like ZnS, and a polymer in which some of the 1H atoms have been replaced by 3H atoms, tritium. The phosphor emits light when struck by the beta particle from the tritium decay, causing the dials to glow in the dark. The half-life of tritium is 12.3 yr. If the light given off is assumed to be directly proportional to the amount of tritium, by how much will a dial be dimmed in a watch that is 50 years old?
The sample required 3.7 mL of 0.0013 M NaOH to titrate the sample to neutrality. What was the pH of the gastric juice? Hypochloridia is defined as having a stomach pH greater than 4. Was the patient suffering from hypochloridia?
Explain why bubbling a solution with an inert gas such as argon or nitrogen causes deoxygenation of the solution?
A solution of potassium chromate is prepared at pH 7.72. Calculate the fraction of the total chromate in this solution that is present as the chromate ion CrO42-.
What is the difference between a state and a microstate of a system? As a system goes from state A to state B, its entropy decreases What can you say about the number of microstates corresponding to each state?
When 1 ml of HNO3 is added to the original solution what are the concentrations of [Ag+] and [Cl-]? I thought that the concentrations would decrease in the latter question, since there is twice as much solution. But shouldn't Q = Ksp, and the equi..
If equal volumes of BaCl2(aq) and NaF(aq) solutions are mixed together, which will NOT give a precipitate (Ksp of BaF2 = 1.7 x 10-7)?
Conductivities are often measured by comparing the resistance of a cell filled with the sample to its resistance when filled with some standard solution, such as aqueous potassium chloride. The conductivity of water is 76 mS m^?1 at 25°C
Write the reaction with water that is the ionization of propionic acid to propionate, draw this out in two ways. First with expanded structures, of course, all atoms and all bonds.
Explain the role of a spin vane or boiling stones that are added to a liquid that is to be heated or distilled
Calculate the number of grams of oxygen required to convert 23.0 g of glucose to CO2 and H20. Also compute the number of grams of CO2 Produced
What is the molecular formula for the compound containing 30.4% nitrogen and 69.6% oxygen by mass and having a molar mass of 92.0 g
Explain which of the following gases would be expected to behave most nearly preferably under the same conditions? H2, F2, HF. Explain
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