Refer to the following descriptions of bonding in different types of solids.(a) lattice of positive and negative ions held together by electrostatic forces(b) closely packed lattice with delocalized electrons throughout(c) strong covalent bonds with weak intermolecular forces(d) strong multiple covalent bonds (including π bonds) with weak intermolecular forces(e) macromolecules held together with strong polar bonds

What are transitions between a liquid and a solid called? identify which way they are transitioning

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

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.