Leia o trecho a seguir.

Disponível em: <http://www.obrasill.com/biologia-e-meio-ambiente/geral/a-importancia-do-nome-cientifico>. Acesso em: 30 set. 2012 (Adaptação).

Uma falha evidente desse procedimento científico foi deixar de

Bebidas alcoólicas, algumas soluções desinfetantes ou até álcool combustível são exemplos de misturas constituídas por etanol (CH₃CH₂OH) e água. A “afinidade” entre esses líquidos é suficiente para possibilitar que a mistura formada por 500 mL de água e 500 mL de etanol origine uma solução de 970 mL, em um processo que envolve liberação de pequena quantidade de energia. De certa forma, isso constitui um problema para os fabricantes, uma vez que, para obterem um litro dessa mistura, necessitariam misturar mais do que 500 mL de cada um dos líquidos.

Do ponto de vista da química, a que se deve essa variação de volume?

(UPE) Uma empresa desenvolveu uma planta industrial para a fabricação de um bioplástico, produzido a partir de um recurso renovável (A), obtido da cana-de-açúcar. Esse polímero verde é quimicamente indiferenciável do polímero comercial, produzido a partir de fontes petroquímicas ou gás-químicas. A parte diferenciada desse processo é a transformação da biossubstância (A) no composto de partida (B), do qual se gera o polímero verde, em uma etapa posterior. A figura a seguir ilustra o processo de desidratação intramolecular de A e de purificação do produto formado (B), com pureza acima de 99,9%

  

(UESC) 

Uma haste condutora, de comprimento igual a 1,0m e de peso igual a 10,0N, cai a partir do repouso, deslizando nos fios metálicos dispostos no plano vertical e interligados por um resistor de resistência elétrica igual a 1,0 Ω, conforme a figura.

Desprezando-se a forças dissipativas e sabendo-se que o conjunto está imerso na região de um campo magnético uniforme de intensidade igual a 1,0T, o módulo da velocidade máxima atingida pela haste é igual, em m/s, a:

Read the following text and answer the following two questions based on it.

E-cigarettes could be prescribed by NHS in world first

England could become the first country in the world to prescribe medicinally licensed e-cigarettes to cut smoking rates.

Fresh guidance from the medicines regulator paves the way for vaping products to be prescribed on the NHS to tobacco smokers.

E-cigarettes were the most popular aid used by smokers trying to quit in England last year, and health chiefs say they have led to some of the highest success rates, alongside local “stop smoking” services, with up to 68 per cent successfully quitting.

But the move could be controversial, after American scientists said earlier this month that people using the devices were 8.5 per cent more likely to relapse within 12 months and return to using their old cigarettes than people who quit entirely.

US researchers revealed they had found that as well as nicotine, e-cigarettes contain unidentified chemicals that could have health risks.

A separate study, in the UK, suggested that vaping could affect people’s lungs just as much as cigarette smoking.

Researchers at Manchester Metropolitan University Institute of Sport found both smokers and vapers showed similar obstruction of the airways in the lungs that can affect people’s ability to efficiently take in air.

However, experts in the UK and US have generally concluded that regulated e-cigarettes are less harmful than smoking. A medicinally licensed e-cigarette would have to pass even more rigorous safety checks, officials say.

Manufacturers will be able to submit their e-cigarettes to the Medicines and Healthcare Products Regulatory Agency to gain approval just like other medicines.

Earlier this month, the Food and Drug Administration in the US gave regulatory approval for the first time to a handful of e-cigarette products after banning tens of thousands of others from being marketed.

E-cigarettes are battery-powered devices with cartridges filled with a liquid that contains nicotine and flavourings. The liquid is heated into a vapour, which the smoker inhales.

More than 6 million people in England still smoke, and they see their GP at least a third more often than non-smokers, according to the NHS. Almost 64,000 people died from smoking in England in 2019, official figures show.

Adaptado de: https://www.independent.co.uk/news/health/nhssmoking-e-cigarettes-medical-prescription-b1947287.html Acessado em 29 de outubro de 2021

According to the text

1) England is bound to officially use e-cigarettes to fight smoking.

2) e-cigarettes have not been used in order to help smokers quit.

3) scientists are sure of the total success of ecigarettes as an aid.

4) other substances in e-cigarttes have been found to be harmful.

5) people’s lungs may be affected both by vaping and by cigarettes.

The following alternatives are right: