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A radioactive isotope has a half life of 43.2 minutes. How long will it take for the radiation from a 580 pCi sample to decrease to 290 pCi?
A radioactive isotope has a half life of 13.6 minutes. How long will it take for the radiation from a 450 pCi sample to decrease to 113 pCi?
A student made a bottle of 6 M NaCl solution in the morning and then stored it in the refrigerator. In the afternoon, he took out the bottle and found NaCl crystals at the bottom of the bottle. Can you explain why the crystals formed
When 0.750 g sample of an unknown substance is dissolved in 20.0 g of benzene, the freezing point of the solution is 4.53 °C. What is the molar mass of the substance
What intermolecular force holds together the 2 strands of DNA and is also important for the secondary and tertiary structure of proteins?
a mass of 2.50 g of hydrated copper sulfate is placed in a crucible and heated. On hesting, 1.59 g of white anhydrous copper sulfate is left behind. determine the ratio of water to copper sulfate.
The thermal decomposition of calcium carbonate produces two by-products, calcium oxide as well as carbon dioxide. Compute the volume of carbon dioxide produced at STP from the decomposition of 231 grams of calcium carbonate.
an aqueous potassium nitrate solution has a freezing point of -2.0 degc. how many moles of potassium nitrate are
considering the given chemical equation as c2h5oh lo2gco2gh2og you just need to balance this equation and also show
a system of 118.0 moles of an ideal gas in 2.3 m3 has a molar internal energy of u 25.0 kjmol at 1.3 bar. what is the
What is the molecular, ionic, and net-ionc forms when nickel(2) nitrate + ammonia (aqueous)
Benzil reacts with 1, 2 diaminobenzene to give a compound with molecular formula C20H14N2. Suggest a structure for this compound and write a reaction mechanism to show how it is formed.
An organic compound has molecular formula c6h12o2, Its IR spectrum shows a strong carbonyl absorption b and near 1740 cm -1. Its 1 H-NMR spectrum
How much energy in joules is required to heat 295 mL of coffee from 25.0 0C to 62.0 0C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 rm J/(gc. K) .
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