Achemistry student accidentally drops a large mercury thermometer and it breaks. the thermometer contained 2 grams of mercury (hg), a potent neurotoxin. the hg leaks out and pools together into a droplet on the floor of the laboratory. the occupational safety and health administration (osha) sets the permissible exposure limit (pel) for mercury vapor in air at 12 parts per billion, by volume. at no time should anyone be exposed to mercury vapor above this threshold. the molar mass of hg is 201 g/mol. the temperature and pressure in the lab are 14.7 psia and 70°f, respectively.

Machinery that is a key part of the process and without which the plant or process cannot function is classifed as: (clo4) a)-critical machinery b)-essential machinery c)-general purpose machinery d)-none of the specified options.

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c

Define thermoplastic polymers and thermosetting polymers in terms of their structures, and (ii) describe briefly a process suitable for the production of products from each type of polymer.