Need !
what is learned if the data from an experiment do not support the hypothesis?
a. incorrect information; the data were not analyzed correctly.
b. some information; the data still valuable information about the hypothesis.
c. no information; the data are bad or incomplete.
d. no information; the experiment is not useful.

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

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.

Which element is least likely to undergo a chemical reaction