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An angstrom is just a unit of length (think meter as another example) that is equal to 1*10^-10 m or 0.1 nm. I know Dr. Lavelle mentioned that angstroms are used to express wavelengths, so they are probably applied in lab in that way as well.
It's important to remember that angstrom is only a measure of distance (meters), so be careful not to call 1 x 10^-10 an angstrom, because it could be 1 x 10^-10 liters or moles or anything, and angstrom wouldn't fit in anything other than meters.
An angstrom is just another unit name for 10^10 meters. So use this if your answer is in meters and is above this amount for a reasonable unit. It's like measuring a road as you would'nt give the distance in centimeters unless specifically asked to for a 4000 m stretch of road.
You'll commonly see it written as Å in this class for exams, etc, and it is used to measure the size of atoms/molecules, the length of chemical bonds, or the wavelengths of electrochem radiation. It is equivalent to 1.0 × 10-10 meters, but its not an SI unit. For example, hydrogen is about 0.5 Å, while chlorine and sulfur are 1 Å.
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