Given the balanced equation representing a reaction: h2 → h + h what occurs during this reaction? 1. energy is absorbed as bonds are formed. 2. energy is absorbed as bonds are broken. 3. energy is released as bonds are formed. 4. energy is released as bonds are broken.

What element is in the lathanide family?

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

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.