All around us are chemical products; the world and the life are chemistry.
There are many. The general term would be optical instruments
Zinc is used in a printing factory because of the chemicals. Zinc does have many types of chemicals in it.
the chemicals used in a grenead are many explosve elements like ZnO and PbO
It is used used as a catalyst in the industrial production of many chemicals.
The general term is 'stain' of which there are several chemicals that can be used, depending on the specimen.
Ammonium chloride is used in fertilizers, calcium chloride is used in many things such as keeping things dry or hard, and sodium chloride is table salt.
General purpose means it can be used for many things. Special purpose means only for a particular thing.
Two things ... Light can be focused (by a lens). There are chemicals which are changed by the presence of light. They are the same rules as are used by vision, but the chemicals are different.
As far as I know, only solvents are used recreationaly, houshold chemicals are used in many drugs' production, but all require uncommon chemicals as well.
There are quite a few different types of chemicals that can be used for ant extermination. A few examples of some active chemical ingredients would be tetramethrin and permethrin.
Generally, businesses working with plastics, metals and/or dyes produce waste that is hazardous to our health and the general health of the outside environment and its inhabitants. The chemicals and fumes from melting plastics and things used to finish metals produce chemicals. Even the factories which make machines and gadgets produce smoke. Run-off chemicals and dyes poison animals, bodies of water, fish and the air. Obviously, factories in the nuclear business produce residual chemicals. :(
Rules for the use of cleaning equipment depend on the type of cleaning equipment is being used. Using the equipment safely would be a general rule. Keeping the equipment clean and in good condition is another general rule. Other general rules might be storing the equipment properly, storing chemicals properly, and using the correct chemicals.