Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii.

which of the following is true about the relative ph of the two substances?
a.
substance i is an acid and substance ii is a base.
b.
substance i is a neutral substance and substance ii is an acid.
c.
substance i is a neutral substance and substance ii is a base.
d.
substance i is a base and substance ii is a neutral substance.

Which best describes why nh4+ can form an ionic bond with ci-?

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.

Answer explain why it is not possible to deduce a complete order of reactivity.