Todas as questões do ENEM

Em um funil de separação, encontram-se, em contato, volumes iguais de duas soluções: uma solução aquosa de I2, de concentração 0,1 x 10-3 mol/L, e uma solução de I2 em CCl4, de concentração 1,0 x 10-3 moI/L. 

Considere que o valor da constante Kc do equilíbrio 

é igual a 100, à temperatura do experimento, para concentrações expressas em moI/L.

Assim sendo, o que é correto afirmar a respeito do sistema descrito? 

Sobre a produção de madeira oriunda de florestas plantadas, no Brasil, para fabricação de papel e celulose, considere o gráfico e as afirmações seguintes:

I. Os estados de São Paulo e Paraná respondem, juntos, por cerca de 50% da produção nacional, em função de sua proximidade com as indústrias processadoras, com o maior mercado consumidor do país e com os principais eixos de exportação.

II. O cultivo de espécies voltadas a essa produção tem avançado sobre territórios dos estados da Bahia e do Espírito Santo, sendo responsável pela subtração de parcela da Mata Atlântica nesses estados.

III. Nos estados da região Sul, que figuram entre os oito maiores produtores do país, essa produção está restrita a pequenas propriedades, associada a produtos voltados à subsistência, tais como laticínios, charque e hortaliças.

Esta correto o que se afirma em

         The perils of counterfeit drugs go way beyond being ripped off by dubious online pill-pushers. The World Health Organization (WHO) estimates that 50 per cent of all medicines sold online are worthless counterfeits. In developing nations fake pills may account for as much as 30 per cent of all drugs on the market. Even in the developed world, 1 per cent of medicines bought over the counter are fakes.

        Some key events illustrate the risk these pose. In Nigeria, 2500 children died in 1995 after receiving fake meningitis vaccines. In Haiti, Bangladesh and Nigeria, around 400 people died in 1998 after being given paracetamol that had been prepared with diethylene glycol – a solvent used in wallpaper stripper. The fakers are nothing if not market-aware: in the face of an outbreak of H5N1 bird flu in 2005, they began offering fake Tamiflu.

         What can be done? The WHO coordinates an umbrella body called the International Medical Products Anti-Counterfeiting Taskforce (IMPACT), an industry initiative that issues alerts when it finds anomalies in the medicine supply chain. Such events include sudden drops in wholesale prices, hinting at fakes coming onto the market, or the mimicking of anti-counterfeiting features on packaging, such as holograms or barcodes, says Nimo Ahmed, head of intelligence at the UK’s Medicine and Healthcare Products Regulatory Agency.

New Scientist, 10 July 2010, p. 18. Adaptado.

         The perils of counterfeit drugs go way beyond being ripped off by dubious online pill-pushers. The World Health Organization (WHO) estimates that 50 per cent of all medicines sold online are worthless counterfeits. In developing nations fake pills may account for as much as 30 per cent of all drugs on the market. Even in the developed world, 1 per cent of medicines bought over the counter are fakes.

        Some key events illustrate the risk these pose. In Nigeria, 2500 children died in 1995 after receiving fake meningitis vaccines. In Haiti, Bangladesh and Nigeria, around 400 people died in 1998 after being given paracetamol that had been prepared with diethylene glycol – a solvent used in wallpaper stripper. The fakers are nothing if not market-aware: in the face of an outbreak of H5N1 bird flu in 2005, they began offering fake Tamiflu.

         What can be done? The WHO coordinates an umbrella body called the International Medical Products Anti-Counterfeiting Taskforce (IMPACT), an industry initiative that issues alerts when it finds anomalies in the medicine supply chain. Such events include sudden drops in wholesale prices, hinting at fakes coming onto the market, or the mimicking of anti-counterfeiting features on packaging, such as holograms or barcodes, says Nimo Ahmed, head of intelligence at the UK’s Medicine and Healthcare Products Regulatory Agency.

New Scientist, 10 July 2010, p. 18. Adaptado.

         The perils of counterfeit drugs go way beyond being ripped off by dubious online pill-pushers. The World Health Organization (WHO) estimates that 50 per cent of all medicines sold online are worthless counterfeits. In developing nations fake pills may account for as much as 30 per cent of all drugs on the market. Even in the developed world, 1 per cent of medicines bought over the counter are fakes.

        Some key events illustrate the risk these pose. In Nigeria, 2500 children died in 1995 after receiving fake meningitis vaccines. In Haiti, Bangladesh and Nigeria, around 400 people died in 1998 after being given paracetamol that had been prepared with diethylene glycol – a solvent used in wallpaper stripper. The fakers are nothing if not market-aware: in the face of an outbreak of H5N1 bird flu in 2005, they began offering fake Tamiflu.

         What can be done? The WHO coordinates an umbrella body called the International Medical Products Anti-Counterfeiting Taskforce (IMPACT), an industry initiative that issues alerts when it finds anomalies in the medicine supply chain. Such events include sudden drops in wholesale prices, hinting at fakes coming onto the market, or the mimicking of anti-counterfeiting features on packaging, such as holograms or barcodes, says Nimo Ahmed, head of intelligence at the UK’s Medicine and Healthcare Products Regulatory Agency.

New Scientist, 10 July 2010, p. 18. Adaptado.