I just took my first Chemistry class on Wednesday and I feel like a complete idiot
I am really struggling with conversions. Any suggestions? I am currently 4.0 and am really worried that this class may be my downfall. My friends 16 year old daughter has offer to tutor me (is that humiliating or what?) and I am actually almost deperate enough to accept. I am worried that if I do not ace Chemistry I may not have what it takes to be a nurse.
Thanks for any input,
Jan 22, '05
Remember that if you are doing conversions, you are basically multiplying what you start out with by a series of fractions that really are "1," so you don't change the value of what you started out with, you are just changing its units.
Kind of like a 100 pennies is a dollar, but so are four quarters, 20 nickels, ten dimes or one of those paper things. LOL
Another way to look at it is, you have what you are starting out with, say, a gallon, and you know where you need to be, say, milliliters. You may not know how many milliliters there are in a gallon, but you do know that.....
There are four quarts in a gallon.
Each quart has two pints, so that means four times two, or eight pints in a gallon.
You know that there are two cups in each pint, so that means two times eight, or sixteen cups in a gallon.
Each cup has eight ounces, so eight times sixteen, which is 128 ounces in a gallon.
Each ounce has about 30 milliliters in it, so 30 times 128 is the number of milliliters in a gallon. (3840 milliliters in a gallon.)
If you take your time and remember what your units are (gallons, ounces, cups, etc.), you will be OK.
Later, when you see the sense of this (and you will, when you think about what you are doing), you can just set up your ratios so you can cancel out your units. (you have to ignore those little marks--it's the only way I could spread out the bottom numbers.)
1 gal . 4 qt . 2 pt . 2 c . 8 oz . 30 ml = (ta-da!)
``1```1 gal``1 qt`1 pt``1 c``1 oz
The units all "cancel out" leaving you with milliliters. And we know that anything "over" one is itself.....
Hope this helps!
Last edit by chris_at_lucas_RN on Jan 22, '05
: Reason: making the spaces on the math part work right
Jan 22, '05
being a microbiology major double i have had to have more chem than ayone should be forced to endure in a liftime.
But i do love chem... I think that makes me weird
anyway when doing conversions start with what you know then use use the correct conversion factors to get what your asked
like the example above
and it works with everything AMUs moles blah blah
if you have specific problems just ask away i am happy to help as long as it isn't with spelling
is this a chem survey class or science major general chem
here in ga nurses can take a survey of chem which is like spoonfulls of assorted topics which i think is good i don't realy see why anyone besdies a chemist needs to know about thermochemistry
since i have a double major in micro i have to take general chem I &II and organic chem I & II luckly though they accpeted those as my pre reqs to nursing school.
there is alot of smart people here we won't let you flunk hehe
Last edit by nursemat on Jan 22, '05