Which of the following statements correctly describes the relative charge of the subatomic particles? protons have the same charge as neutrons - protons and electrons have equal but opposite charges - protons and neutrons have equal but opposite charges - electrons and neutrons have equal but opposite charges

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

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 a metal replacement reaction