I NEED HELP PLEASE, THANKS! :)

At temperatures below 32oF, water forms ice. This observation is best described as

macroscopic.
symbolic.
microscopic.
both macroscopic and microscopic.

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.

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

What element has similar physical and chemical properties as boron.