1 Extravasation can also be recognized more quickly when promethazine is diluted than if the drug is given in a smaller volume. 2  Administer the medication through large patent veins (i.e., preferably via a central venous access site, absolutely no hand or wrist veins). 3  Check the means of administration.
The element platinum can be used as a catalyst in some chemical reactions. allanswart/iStockphoto. Catalysts are the unsung heroes of the chemical reactions that make human society tick. A catalyst is some material that speeds up chemical reactions. With a helping hand from a catalyst, molecules that might take years to interact can now do so in seconds. Factories rely on catalysts to make everything from plastic to drugs. Catalysts help process petroleum and coal into liquid fuels. Theyâre key players in clean-energy technologies.
Types of catalytic reactions Catalysts can be divided into two main types-heterogeneous and homogeneous. In a heterogeneous reaction, the catalyst is in a different phase from the reactants.In a homogeneous reaction, the catalyst is in the same phase as the reactants.ypes of catalytic reactions Catalysts can be divided into two main types-heterogeneous and homogeneous. In a heterogeneous reaction, the catalyst is in a different phase from the reactants.