primary amines can be converted into secondary amines by reaction with haloalkanes. this reaction is difficult to achieve in the lab because of the large number of byproducts. select the possible products or byproducts of the reaction.

it's c. elements are placed in rows based on how may valencies electrons have.

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.