{"title":"Questão 116 - ENEM 2018","index":116,"discipline":"ciencias-natureza","language":null,"year":2018,"context":"Células solares à base de![](https://enem.dev/2018/questions/116/2d27898b-8b13-4d5b-bb48-e79640308974.png) sensibilizadas por corantes (S) são promissoras e poderão vir a substituir as células de silício. Nessas células, o corante adsorvido sobre o ![](https://enem.dev/2018/questions/116/6e7c4773-4fd4-43cf-baae-47d2e874e74c.png) é responsável por absorver a energia luminosa ![](https://enem.dev/2018/questions/116/9a3c2e7d-6301-4343-bb7c-cd88c3bedc79.png), e o corante excitado (S\\*) é capaz de transferir elétrons para o ![](https://enem.dev/2018/questions/116/c41d5271-b539-48b4-b4b1-118459e8e8e0.png). Um esquema dessa célula e os processos envolvidos estão ilustrados na figura. A conversão de energia solar em elétrica ocorre por meio da sequência de reações apresentadas.\n\n![](https://enem.dev/2018/questions/116/53bc5276-aff8-461d-9dfc-57f3d1fe0731.png)","files":["https://enem.dev/2018/questions/116/2d27898b-8b13-4d5b-bb48-e79640308974.png","https://enem.dev/2018/questions/116/6e7c4773-4fd4-43cf-baae-47d2e874e74c.png","https://enem.dev/2018/questions/116/9a3c2e7d-6301-4343-bb7c-cd88c3bedc79.png","https://enem.dev/2018/questions/116/c41d5271-b539-48b4-b4b1-118459e8e8e0.png","https://enem.dev/2018/questions/116/53bc5276-aff8-461d-9dfc-57f3d1fe0731.png"],"correctAlternative":"B","alternativesIntroduction":"A reação 3 é fundamental para o contínuo funcionamento da célula solar, pois","alternatives":[{"letter":"A","text":null,"file":"https://enem.dev/2018/questions/116/3eaf75c7-ef77-48b0-aad3-94a8b52a6ce2.png","isCorrect":false},{"letter":"B","text":null,"file":"https://enem.dev/2018/questions/116/b6068734-cd1c-4dc6-ab56-a68d692dc4ea.png","isCorrect":true},{"letter":"C","text":null,"file":"https://enem.dev/2018/questions/116/6d6ead61-fc78-43c3-8636-bd86b858325b.png","isCorrect":false},{"letter":"D","text":null,"file":"https://enem.dev/2018/questions/116/8f024003-e8cd-4bc0-8000-464bdf4a0778.png","isCorrect":false},{"letter":"E","text":null,"file":"https://enem.dev/2018/questions/116/85dd2cd6-fc8f-4f02-802f-7a0b7d0533c1.png","isCorrect":false}]}