Identify the option below that is FALSE about homogeneous catalysts. Select the correct answer below: A. They are present in the same phase as the reactants.
B. They are always regenerated by the end of the reaction.
C. An example of a homogeneous catalyst is a layer of carbon (graphite) providing a reactive surface for an all-gas reaction.
D. They typically interact with reactants to form intermediates, which eventually react away to regenerate the catalyst.

Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution