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A Geiger counter registers a count rate of 6,800 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 1,700 counts per minute. What is the half-life of the radioisotope?
The following percentages of sulfate were found in a sample: 30.54, 30.34, 30.52 and 31.05. Find the mean, the standard deviation, and the relative standard deviation. Can any of the results be discarded
How many grams of dry NH4Cl need to be added to 1.80L of a 0.400M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.90? Kb for ammonia is 1.8*10^-5.
What is the mole fraction of HO2CCH2CHOHCO2H in this solution suppose you dissolve 2.56 grams of malic acid HO2CCH2CHOHCO2H in 50.0 grams of H 2 O.?
One of the emission spectral lines for Be3+ has a wavelength of 253.4 nm for an electronic transmission that begins in the state with n = 5.
How will the melting point of your semicarbazone derivative be affected if the derivative is not dry enough
Nitroglycerine decomposes violently according to the unbalanced chemical equation below. What mass of nitrogen gas is produced from the decomposition of 0.300 mol C3H5(NO3)3. C3H5(NO3)3(l) ? CO2(g) + N2(g) + H2O(g) + O2(g)
A 1.5618-g sample containing sulfate ion was treated with barium chloride reagent, and 0.2321 g of barium sulfate was isolated. Calculate the percentage of sulfate ion in the sample.
Calculate the solubility of silver bromate (AgBrO3), using activities, in a saturated solution of silver bromate. Ksp for Ag(BrO3) = 5.5 x 10-5
Question: How does the ph scale work? What is the difference between acid and base?
Arrange the following elements in order of increasing ionization energy, and explain how you know the order
The flask was removed, was quickly cooled to condense the volatile liquid, dried and weighed. The mass of the flask and the volatile liquid is 34.743 grams
Calculate the volume of hexane that you need at minimum, if you want to extract at least 95% of the total 1,2,4-TCB present in the water sample
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