Using the NIOSH Manual of Analytical Methods (NMAM), answer the following questions for dichloromethane (CAS: 75-09-2):

Assuming that you would like to be able to detect a concentration of 1/10th of the OSHA PEL, and that you will use a sampling flow rate of 50 mL/min, what is the minimum amount of time that you would need to collect the sample?

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Which is a difference between molecular compounds and ionic compounds? select the correct answer below: question 5 options: molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. molecular compounds have high melting points and high boiling points, while ionic

Using data from seismic waves, geologists have learned that earth’s interior is made up of several