# Chemistry Tips

I tutored a student in regular, high school Chemistry AB last year, and I put together a list of important points to remember. Here is what I wrote. Some of the tips are only important for beginner’s chemistry and are not applicable in higher levels. However, I assume that if you are in a higher level of chemistry, you are familiar with the occasion to use that tip (such as converting mass).

1. A mole is a unit of quantity in the same way a dozen is a unit of quantity.
2. When starting a problem, always write the given numbers and information.
3. Set up given in dimensional analysis and write the given unit diagonally.
4. REMEMBER UNITS.
5. If the units don’t cross out, there is either a problem OR it is the unit you are looking for.
6. Always exchange mass and # of particles with moles. ( Mass (g) -> Moles (mol) <- # of particles )
7. Division help: Cowboy rides horse (Cowboy/Horse). At night, the cowboy sleeps in the house, and the horse sleeps outside (picture long division with the cowboy beneath the sign)
8. To calculate molar mass on a calculator, visually move the subscripts behind the element and replace the element letter(s) with their own molar mass. Multiply and add as needed. [Ex: C2H3O2 becomes 2(12.01)+3(1.01)+2(16)]
9. If mass is associated with mole, use molar mass.

Tips for Quest (from UTexas)
1. Use "E" notation in place of scientific notation [*10^(exponent)] (Also, do not call this "e to the…" because there is an actual "e", the natural number. Refer to this as "E exponent"
2. Likewise, do not mix up e^(exponent) and E(exponent)
3. Writing the units is not necessary, but MAKE SURE THE ENDING UNITS ARE WHAT QUEST WANTS.