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The amount of cadmium in a sample is determined by AAS. The standard solutions produce a straight calibration curve with a slope of 0.1024 +_0.0082 abs. units/ppm and a y-intercept of 0.0105 +_ 0.0076 abs. units. The absorbance of the unknown solution A=0.4862 +_ 0.0184 abs. units. Determine the un certainty in the concentration of the unknown.
if a sample of the compound contains 9.41x10^21 lithium ions, how many oxide ions does it contain? show units, show work and answer in scientific notation.
Write balanced net ionic equation for the reactions that take place when the following reagents are mixed together in aqueous solution:
A 36.4 L volume of methane gas is heated from 25 degrees celcius to 88 degrees celcius at constant pressure. What is the final volume of the gas?
calculate the mass in kilograms of 3.99 liters of acetic acid. the density of this substance is 1.05g/mL ?
The lid is tightly sealed on a rigid flask containing 3.50 L H2 at 17 °C and 0.913 atm. If the flask is heated to 71 °C, what is the pressure in the flask?
If a student starts with 615g of Co(NO3)2 and obtains a 57.3% yield of CoS, what mass of CoS is isolated? Co(NO3)2 +K2S ---> CoS + 2KNO3
A dark glass bottle of chemicals is found in cleaning out an old basement. Part of the label has been eaten away with age. Only the last part of the label is readable.
When a sucba diver goes to a dive shop to have her scuba tanks filled with air, the tank is connected to a compressor and filled to about 2100 psia while immersed in a tank of water (so that the compression of air into the tank will be approximate..
Write down the full Hamiltonian for a He atom moving freely in space, i.e., there is no external potential. b) Now assume there is no repulsion between the electrons
Iridium-192 is often used in the head or breast. Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium-192, shown below. Click on the graph and move the mouse over a point to get values for that point.
calculate th eapproximate freezing points of the following aqueous solutions (assume complete dissociation) a. 0.800 m NaCl b. 0.800 m
n-type semiconductors can be formed by addition of the elemental metals to the parent compound. For example, addition of Zr to ZrO or Ti to TiO. Like wise, p-type semiconductors
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