The EPA drinking water standard for toluene is 1 mg/L. What is this concentration in ppb?
A) 0.001
B) 0.1
C) 1
D) 1000
Question 2
High-density polyethylene is composed of
A) primarily linear, unbranched chains of polyethylene in a close packing arrangement.
B) primarily highly branched, non-linear chains of polyethylene in a diffuse packing arrangement.
C) a mixture of polyethylene and polystyrene.
D) polyethylene with high density plasticizers added to increase density.
