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I believe that he said that most of the SI unit conversions would be given on the test (don't quote me on this), but it would also be good to have them memorized anyways to make working through homework problems easier. Feel free to correct me if I'm wrong though, I'm not 100% sure.
I think that understanding the most common prefixes for SI units would not be a bad thing to study, not just for this test but for the entire rest of the class! Being familiar with kilo (10^3), centi (10^-1), milli (10^-3), micro (10^-6), nano (10-9), and pico (10^-12) would be the most helpful so that you can quickly do the most common conversions to the SI base units, which is an essential step to solving many different types of chemistry problems.
Based on the homework questions, the main units we were using were grams, liters, and moles. Be sure that you pay attention to the given information, as sometimes they give data in milligrams or milliliters so you'll have to convert to the standard units in order to use the information in equations. Also, you should be familiar with the other common prefixes (such as kilo, pico, centi, etc.) just in case and know how to convert these to the base unit.
Based on the lecture, base SI units we need to know are grams (mass), meters (length), and seconds (time). It's also helpful to note certain prefixes, such as: Giga (G), mega (M), kilo (k), centi (c), milli (m), micro, and nano (n), and the degree each indicates.
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