HESI Chemistry
While chemistry may not seem relevant to nursing, it’s more applicable than you might
think. Nurses must understand the use of the medication they are providing, the
conversions, and they even need to understand how the medications work. Advancing
your career into more specialized fields requires you to posses not only a basic
understanding of chemistry, but perhaps organic chemistry, or physical chemistry as
well. Having a solid foundation in chemistry is key to understanding how certain drugs
interact, which directly affects patient outcomes. Here are some basic chemistry
concepts you should understand in order to do well on the Chemistry section of the
HESI exam:
Units of Measurement
Metric
m
er as
Volumes are usually measured in milliliters (ml) or cubic centimeters (cm3).
co
eH w
1 ml = 0.001 L
o.
1 Liter = 1 cm3
rs e
ou urc
e.g. 5 L = 5000 ml = 5000 cm3
Masses are usually measured in grams (g) or kilograms (kg), where 1 kg = 1000 g.
o
The volume of 1 kg of water is approximately 1 L. So the volume of 1 g of water is
aC s
roughly 1 L / 1000 = 1 ml or 1 cm3
vi y re
.
Lengths are commonly measured in meters (m), centimeters (cm), or millimeters (mm).
ed d
Imperial
ar stu
Imperial units are less commonly used now, but you may need to convert from imperial
to metric. Imperial units of volume are pints and gallons. Lengths can be given in
is
inches, feet, yards, or miles and masses can be given in ounces, pounds, or stones.
Th
1 gallon = 4.5 liters
1 liter = 1.75 pints
sh
1 inch = 2.54 cm
1 foot = 30.5 cm
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