Classify each of these reactions. 2hbr(aq)+ba(oh)2(aq)⟶2h2o(l)+babr2( aq) 2hbr(aq)+ba(oh)2(aq)⟶2h2o(l)+babr2( aq) c2h4(g)+3o2(g)⟶2co2(g)+2h2o(l) c2h4(g)+3o2(g)⟶2co2(g)+2h2o(l) cu(s)+fecl2(aq)⟶fe(s)+cucl2(aq) cu(s)+fecl2(aq)⟶fe(s)+cucl2(aq) na2s(aq)+2agno3(aq)⟶2nano3(aq)+ag2s (s) na2s(aq)+2agno3(aq)⟶2nano3(aq)+ag2s (s)

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.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests. which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory