Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
CATALYSTS
A catalyst is a species that speeds up a chemical reaction but is not itself consumed. Catalysts do not change the thermodynamics of the position of equilibrium or a reaction, but react by providing an alternative pathway of lower activation energy. They allow many reactions to be done at lower temperatures than without a catalyst, and also give selectivity in producing a specific product in reactions where various products are feasible thermodynamically. Enzymes are distinct selective biological catalysts.
A catalyst present in the same phase as the reactants is called homogeneous; one in a distinct phase is heterogeneous. Most heterogeneous catalysts are solids, and react by adsorption of liquid or gaseous reactants on a surface. Homogeneous catalysts are specific molecules, usually organ metallic compounds that can be tailored in a more specific way to produce a required product than is possible with heterogeneous catalysts.
Industrial and domestic plastics are mostly prepared by polymerizing alkenes:
The reaction is exothermic and may be started by free radicals but organ metallic catalysts produce more controllable results. Most commonly used is Ziegler-Natta catalysts build by mixing Al2Et6 with TiCl4. Solid TiCl3 is build and catalysis occurs at surface Ti-Et groups, to which alkene molecules undergo and coordinate insertion into the Ti-R bond. An advantage of these catalysts is that they may form stereoregular polymers where all the R parts in -C(R)H CH2- have the same stereo chemical configuration. This produces stronger materials with greater melting points than the random stereochemistry resulting from radical polymerization.
all
what is first transition series
how to calculate equevalent mass
1. A laboratory animal exercised on a treadmill that was connected to a weight with a mass of 250. g through a pulley. The work done by the animal raised the weight through 1.32 m.
Draw the structure of anisole and phenetole
what is acid
Q. Show the Halides of Aluminium? All the four trihalides of aluminium, i.e. AIF 3 , AICI 3 ,, AlBr 3 , and AlI 3 , are known. AIF 3 , is made by treating Al 2 0 3 with HF ga
What are distinguishing characteristics of metallic bonding? Metallic state can be visualized like an array of positive ions, with a common pool of electrons to
Hello. Do you know the rubric of what I need to know about chemistry because I am taking Chemistry this fall and I would like to know the basics
i have a thermogram of magnesium oxalate and have to determine the mass lost in each step. And also calculate the number of water of hydration for each oxalate hydrate .
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd