A(n) Acute exposure is a short term or brief exposure that may create an immediate health hazard. Answer: A)
5-Ethyl-3,3,4-trimethylheptane has 3 secondary carbon. A primary carbon written as 1° is a carbon that has one carbon atom attached to it. A secondary carbon written as 2° is a carbon attached to two other carbons, while a tertiary carbon written as 3° is a carbon attached to three other carbons.
We subtract the enthalpies of the reactants from that of the products:

Since this is < 0, this is an exothermic reaction.
The answer is B plastic bags made from petroleum.