Mr. Chandler is in a conundrum. He has gone over his cooperative learning approach meticulously and cannot find the reason behind students' lack of enthusiasm and group engagement. He has tried to incorporate materials that are appropriate as well as infused with content matter of interest to them. He has told each student how important the lesson is for the term paper on Friday. What is Mr. Chandler missing?

Group rewards

Explanation: Group reward is geared at improving level of cooperation, coherence and efficiency within groups of individuals, this is aimed at achieving increased output, drive productivity and encourage level enthusiasm of the members involved. Working as group could be very difficult especially due to factors such as individual differences, work input, cultural diversity and so on, fusing members into a group may lead to reduced output, incessant disagreement and low productivity. Therefore the introduction of group reward which involves credit and compensation to members requires that the group work together toward collective success.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals