Alkyl halides are used as an alkylating agent in various chemical transformations. the alkyl halide ethyl chloride can be prepared by the following chemical reaction in a certain reaction process, fresh ethane and chlorine gas are mixed with a recycle stream of pure ethane and fed to a reactor. a test shows that if 100% excess chlorine is mixed with ethane, a single-pass conversion of 60% is obtained, and of the ethane that reacts, all is converted to products and none goes into undesired products. the reactor effluents are fed to a separator with three streams. pure ethyl chloride is obtained from one stream, while pure ethane is separated out and recycled back to be mixed with the fresh feed in another stream. (use the extent of reaction method) a) draw a fully labeled flow diagram for the above process b) perform the degree of freedom analysis using the extent of reaction method c) calculate (i) the fresh feed concentrations required for operation, and (ii) the moles of c2hsci produced in the final product stream per mole of c2hs in the fresh feed

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

environmental implications of pesticides

synthetic pesticides ensure high crop yields. while effective in achieving this goal, pesticides contaminate soil, air, ground and surface water, as well as the plants and animals that come into contact with these contaminated sources. freshwater and marine organisms are particularly susceptible to pesticides through agricultural runoff. pesticides also reduce soil fertility (necessitating the use of synthetic fertilizers) and can travel far from the original source, contaminating water and air hundreds of miles from the location of application (see references 2).

health implications of organics

although a subject of particular debate, many recent findings show that organic food is healthier than conventionally grown food. according to the usda, an extensive european union-funded study found that organically grown foods contain more beneficial compounds, such as the vitamins and antioxidants needed to combat many diseases (see references 5). organic milk, meat and eggs are regulated to ensure they are free of hormones administered to conventional livestock and poultry.

health implications of pesticides

pesticides affect human health in three ways: through skin contact, inhalation and ingestion. acute and long-term exposure to pesticides can cause serious health problems for farmers who apply them. the majority of other people are affected by drinking contaminated water and eating contaminated marine life (see references 3). pesticides have been linked to neurological disorders, endocrine and reproductive disorders, immune system deficiencies and cancer. according to the world health organization, acute pesticide poisoning (app) is responsible for significant annual mortality, especially in developing nations (see references 4).

other important considerations

not every small farm or business owner can afford the costly certification process required to be considered "certified organic," even if the farm is not using chemicals. "transitional" farms include those that once used chemicals and are now transitioning to organic-only production. in addition, though organic farming methods offer obvious environmental benefit, an organic apple shipped from around the world creates a different set of environmental problems. locally grown food (particularly locally grown, organic food) is key in sustainable food production.

fe 55.85 g/mol and h2o 18.02 g/mol.