Which of the following will result in a chemical change? a. drying wood in a shed b. evaporating alcohol into vapor c. burning coal in a furnace d. melting ice to obtain water

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.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Which states of matter have particles that move independently of one another with very little attraction?