An atom has an atomic number of 12 and a mass number of 25. how many neutrons does the atom have?

12
13
25
37

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

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.

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas