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Some calculations, such as those regarding wavelength, operate with units of meters, so watch out for those. In that case, if you are given some measure in centimeters, convert that value to meters to then use in your calculation.
typically in problems they give compounds/etc in the standard units, they expect to be calculated in those respective units. Unless you know that those units are not standard for the certain object, then you may have to convert. they should be given most of the time though.
You should convert from a smaller unit to a larger unit when the value you are looking for in your answer requires a larger unit but the given value in the question came in the smaller unit. For example, when looking for mass, you should write your answer in grams, which means you would need to convert a given value in milligrams.
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