Which of the following sets gives the correct formal charges for the elements in the Lewis structure below? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a S: -2 C: -4 N: -3 S: +6 C: +4 N: +5 S: -2 C: -4 N: -2 S: +1 C: 0 N: -1 e S: 0 C: 0 N: –1 :S:

In a groundwater 1,1,1 trichloroethane, hexachlorobenzene and 1,1,2 trichloroethane have leached from an underground industrial landfill. Which compound would you expect to move fastest with groundwater? Which would be easiest to remove by air stripping? Which would be best to remove by adsorption?

Consider each of the following monomers and predict if it would likely undergo radical, anionic, or cationic addition polymerisation. Then, in the space provided below, draw the electron pushing mechanism for the initiation and the first propagation steps of the monomer that you chose for each (the catalyst is provided for you). Then draw what the growing polymer chain looks like and briefly indicate why you chose that monomer to undergo the selected type of polymerisation (hint: consider concepts such as electron donating group, electron withdrawing group, resonance, and hyperconjugation!)

Click and drag from the options below to complete these sentences. Answers may be used more than once. In a continuous fibre reinforced composite where the fibres are well aligned, the strength in the transverse direction will be the strength in the longitudinal direction. The stiffness of the composite in the transverse direction will be the stiffness in the longitudinal direction. greater than similar to less than