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Questões de EFAF Ciências
15.501 Questões
Marca Texto
Modo Escuro
Questão 8361533
OBQJr OBQJr 2017 F2N1 2017
Resolução comentada
Uma determinada substância tem sua molécula representada acima. Quando em solução aquosa, essa molécula é produzida pelo organismo humano, sendo encontrada no suco gástrico.
Que tipo de substância é abordada nesse contexto?
Questão 8361532
OBQJr OBQJr 2017 F2N1 2017
Resolução comentada
O rótulo de uma solução aquosa comercializada para a floração de orquídeas é mostrado a seguir.
Essa solução possui alta concentração de
Questão 8361529
OBQJr OBQJr 2017 F2N1 2017
Resolução comentada
Determinada substância inorgânica líquida é solúvel em água. A destilação de sua solução aquosa resulta em um azeótropo com uma concentração de 68%. O principal uso dessa mistura se destina à fabricação de nitrato de amônio, usado na pólvora e como fertilizante.
Qual é a substância descrita no texto?
Questão 8361521
OBF OBF 2017 F1N1 2017
Resolução comentada
Dois copos idênticos estão com água até o mesmo nível (na metade de seus volumes), porém um deles possui cubos de gelo flutuando. Quando os cubos de gelo derreterem, em qual copo o nível de água ficará maior?
Questão 8361518
OBF OBF 2017 F1N1 2017
Resolução comentada
Suponha que dois carrinhos de laboratório, um com o dobro da massa do outro, estejam parados sobre trilhos horizontais e paralelos. Um garoto empurra cada carro durante segundos. Desprezando-se o atrito e supondo que o garoto tenha exercido forças iguais em ambos os carrinhos, podemos afirmar acertadamente que:
Questão 8361516
OBF OBF 2017 F1N1 2017
Resolução comentada
O Professor Physicson, durante suas aulas sobre colisões, propôs aos seus alunos o seguinte problema:
Considere um grande caminhão colidindo de frente com um pequeno fusquinha. Com relação às forças trocadas entre os dois, durante a colisão, podemos afirmar corretamente que:
Anterior
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