n automotive designer must decide what materials to use to build his new car. Explain how he would decide what materials he should order based off the materials density. Explain why the density of the objects would be important when choosing his materials.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Compare the valence electron configuration of the nobles gas elements seen here. what statement is 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.