1) What are the three primary routes of chemical exposure? (3pts)
a) Eye exposure.
b) Oral and nasal exposure
c) Dermal exposure
2) For each route of chemical exposure, provide one practice that can be used to minimize
or prevent that exposure. (3pts)
a) Eye exposure- always wear protective goggles to minimize splash of irritative
chemicals on the eye
b) Oral and nasal exposure- wear a protective mask and avoid eating or drinking
anything in lab. A fume chamber in necessary to release poisonous gases out of
the lab
c) Dermal expose- One must where a lab coat, and closed protective shoes to avoid
contact of chemicals on the skin. It is important to wash hands while leaving or
getting into the lab or wear gloves when required to.
3) A chemist determines her mass on a scale to be 65.3 kg. She removes a calculator from
her pocket. The mass of the calculator was determined to be 175 g. With respect to
significant figures what is the new mass of the chemist? (4pts)
1kg is equivalent to 1000g
What about 175g
175/1000 = 0.175kg
65.3-0.175 = 65.126 ~65.1 kg
4) The dimensions of a box (with all right angles) were determined. The length is 10.4 cm.
The width is 9.7 cm and the height is 20.0 cm. With respect to significant figures, what
is the volume of the box? (4pts)
V = L×W×H
V=10.4×9.7×20.0
V= 2017.6 cubic centimeter