Which of the following describes a heterogeneous mixture?
a
carbon monoxide, a toxic gas with the chemical formula co

b
simple syrup, a substance that has two parts sugar to every one part of water throughout

c
beach sand, a substance that can contain rocks, shells, metals and other substances distributed unevenly throughout

d
sulfur, a substance with atomic number 16 and the symbol s on the periodic table.

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.

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Avariable that is not being directly tested during an experiment should be changed varied experimented controlled