Which of the following correctly compares the radii of F and F-?
F has a smaller radius than F- because an additional electron causes greater repulsion in F.
F has a larger radius than F-because an additional electron causes greater repulsion in F.
F has a smaller radius than F-because F has an additional energy shell.
F has a larger radius than F- because F has an additional energy shell

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)

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.

Joan writes four numbers on the board in standard form, and then she writes their scientific notation