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The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
Suppose your thermometer read consistently 1.0 o C lowered throughout both parts in the colligative properties lab. What effect would that have on your experimental value for the molar mass of your unknown solute?
Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines
Presence of Aldehyde Group, An excellent way to identify the presence of an aldehyde group is by 1H NMR. The chemical shift of the aldehydic proton occurs in the 9-10-ppm region
Calculate the standard emf for each of the following reactions:a)H2(g) + F2(g)---> 2H+(aq) + 2F-(aq)
What is the ground state electron configuration for the boron atom? What term symbols can arise from this electron configuration?
The insecticide DDT has a half-life in the human body of about 7 years. That is, in 7 years its concentration.( Although DDT is no longer in use in the United States).
Determine which ion will precipitate first and at what concentration of sulfate ion will the first precipitate begin to form?
What is the percent yield of a reaction in which 244 g phosphorus trichloride reacts with excess water to form 144 g HCl and aqueous phosphorus acid (H3PO3)?
A gas was enclosed in a rigid-walled container. The initial temperature and pressure were 52°C and 0.55 atm, respectively. If the final pressure were 2.41 atm.
"The chains of several cell membrane - bound proteins are known to wind back and forth through the cell membrane, such that some parts of the protein structure are extracellular, some parts are intracellular, and some parts lie within the cell mem..
Determine the second order rate constant from the initial concentration and half life and what is the second order rate constant?
Determine what percent by weight of sodium carbonate does it contain If the specific gravity of the sodium carbonate solution = 1.25,?
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