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?

If two identical atoms are bonded,what kind of molecule is formed

An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i