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A rock from Australia was found to contain 0.438 g of Pb-206 to every 1.00 g of U-238. Assuming that the rock did not contain any Pb-206 at the time of its formation how old is the rock?
Orange juice is an aqueous solution that derives much of it's acidity from citric acid. There are variations in the acidity of each brand depending on many factors
When a He atom absorbs a photon to form the excited configuration 1s^1 2s^1 (here called He*) a weak bond forms with another He to form the diatomic molecule HeHe*. Construct a molecular orbital description of the bonding in this species.
How does electron configuration work. If I have [Ar]3d^5 as an example how do know what it actually equals
A bottle is labeled only "Compound B (C6H12)" and contains a colorless liquid. You have been called in as an expert to identify this compound from its spectra
(a) What is the pH of this buffer (b) What is the pH of the buffer after the addition of 0.48 mol of NaOH. (assume no volume change) (c) What is the pH of the original buffer after the addition of 0.23 mol of HI. (assume no volume change)
If the highest possible oxidation state for the halogens is +7, and the lowest possible is -1 which of the following could not disproportionate?
Which of the following molecular geometries could lead to linear molecule after removal of one atom? A.T-shaped B.See-saw c.Trigonal Bipyramid d.Triangular planar e.Bent
Calculate the amount of heat required to raise the temperature of 100.0g of water from -0.10 C to +0.10 C
A 100 mL sample of .20 M HF is titrated with .10 M KOH. Determine the pH of the solution before the addition of any KOH. The Ka of HF is 3.5 * 10^-4
at 760 k 15 of a sample of cyclopropane changes to propene in 6.8 min. what is the half-life of cyclopropane at 760
A gas made up of atoms escapes through a pinhole times as fast as gas. Write the chemical formula of the gas.
Determine the amount of heat (in kJ) given off when 1.89 104 g of ammonia are produced according to the following equation. Assume that the reaction takes place under standard-state conditions at 25.0°C.
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