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chemistry
march 2020
03

Chemistry Questions and Answers March 03, 2020

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Both technetium99 and thallium201 are used to image heart muscle in patients with suspected heart problems. Both radioisotopes decay by first order processes and have half-lives of 6 h and 73 h, respectively. What percent of the radioactivity would remain for each of the isotopes after 2 days (48 h)?

In a laboratory experiment in calorimetry, 100. mL of 0.500 M acetic acid is mixed with 100. mL of 0.500 M sodium hydroxide in a calorimeter. The temperature rises from 25.00C to 27.55C. The heat capacity of the calorimeter is 150.48 J/C, and the density of the resulting solution is 1.034 g/mL. Given the specific heat capacity of 0.250 M sodium

What class of organic compound with less than five carbon atoms dissolves in water to form a slightly basic solution

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