Todas as questões do ENEM

Temperatura (ºC)          Solubilidade do Sal (g/100g de H ₂O)
      30                                              60
      50                                              70

Para dissolver 40 g desse sal à 50 °C e 30 °C, as massas de água necessárias, respectivamente, são:

Em um sistema fechado considere a seguinte reação química em equilíbrio e analise as proposições.



I. Aumentando a concentração de CO_(g) o equilíbrio se desloca para a direita.
II. Aumentando a concentração de CO_(g) o equilíbrio não é alterado.
III. Retirando CO_(g) o equilíbrio se desloca para a esquerda.
IV. À adição de CO_2(g) o equilíbrio se desloca para a esquerda.
V. A adição de uma substância desloca o equilíbrio no sentido que irá consumi-la.
VI. O equilíbrio só se desloca no sentido da formação dos produtos.

Assinale a alternativa correta.

Sobre o composto, é incorreto afirmar que:

A corrente e a potência nessa nova configuração assumem, respectivamente, os valores:

Read the Text 2 and answer the questions from 46 to 50.
TEXT 2  
                                                  Pros and Cons of Nuclear Power
Sergei Supinsky: This storage facility near the site of the Chernobyl Nuclear Power Plant currently houses nuclear waste. What's nuclear power's biggest advantage? It doesn't depend on fossil fuels and isn't affected by fluctuating oil and gas prices. Coal and natural gas power plants emit carbon dioxide into the atmosphere, which contributes to climate change. With nuclear power plants, CO2 emissions are minimal. According to the Nuclear Energy Institute, the power produced by the world's nuclear plants would normally produce 2 billion metric tons of CO2 per year if they depended on fossil fuels. In fact, a properly functioning nuclear power plant actually releases less radioactivity into the atmosphere than a coal-fired power plant. Plus, all this comes with a far lighter fuel requirement. Nuclear fission produces roughly a million times more energy per unit weight than fossil fuel alternatives. And then there are the negatives. Historically, mining and purifying uranium hasn't been a very clean process. Even transporting nuclear fuel to and from plants poses a contamination risk. And once the fuel is spent, you can't just throw it in the city dump. It's still radioactive and potentially deadly. On average, a nuclear power plant annually generates 20 metric tons of used nuclear fuel, classified as high-level radioactive waste. When you take into account every nuclear plant on Earth, the combined total climbs to roughly 2,000 metric tons a year. All of this waste emits radiation and heat, meaning that it will eventually corrode any container that holds it. It can also prove lethal to nearby life forms. As if this weren't bad enough, nuclear power plants produce a great deal of low-level radioactive waste in the form of radiated parts and equipment. Over time, spent nuclear fuel decays to safe radioactive levels, but this process takes tens of thousands of years. Even low-level radioactive waste requires centuries to reach acceptable levels. Currently, the nuclear industry lets waste cool for years before mixing it with glass and storing it in massive cooled, concrete structures. This waste has to be maintained, monitored and guarded to prevent the materials from falling into the wrong hands. All of these services and added materials cost money -- on top of the high costs required to build a plant. Disponível em: Acesso em: abr. 2011.  

Read the Text 1 and answer the questions from 41 to 45.

                                                     Recycle – Reduce – Reuse
Easier – Recycle means to process old, used items in order that the material can be used to make new products. Examples of things that are often recycled are glass, plastic, newspapers, aluminum cans, used motor oil, and batteries. Here, reduce refers to lessening the amount of items or resources that are consumed, using only the amount that is needed, and looking for alternatives that will lessen our use. And reuse means extending the 'life' or repurposing an item rather than discarding or throwing it away. Harder – Recycling is the processes of collecting, processing, remanufacturing, and reusing materials instead of discarding them. This helps conserve raw materials and energy that manufacturers would otherwise use in producing new products. Recycling also reduces the amount of material going into landfills. Recycling helps lessen the pollution that may result from waste disposal. Reducing our consumption of materials and reducing the waste of materials also adds to the conservation of our resources. Disponível em: Acesso em: abr. 2011.  

Read the Text 1 and answer the questions from 41 to 45.

                                                     Recycle – Reduce – Reuse
Easier – Recycle means to process old, used items in order that the material can be used to make new products. Examples of things that are often recycled are glass, plastic, newspapers, aluminum cans, used motor oil, and batteries. Here, reduce refers to lessening the amount of items or resources that are consumed, using only the amount that is needed, and looking for alternatives that will lessen our use. And reuse means extending the 'life' or repurposing an item rather than discarding or throwing it away. Harder – Recycling is the processes of collecting, processing, remanufacturing, and reusing materials instead of discarding them. This helps conserve raw materials and energy that manufacturers would otherwise use in producing new products. Recycling also reduces the amount of material going into landfills. Recycling helps lessen the pollution that may result from waste disposal. Reducing our consumption of materials and reducing the waste of materials also adds to the conservation of our resources. Disponível em: Acesso em: abr. 2011.  

Read the Text 1 and answer the questions from 41 to 45.

                                                     Recycle – Reduce – Reuse
Easier – Recycle means to process old, used items in order that the material can be used to make new products. Examples of things that are often recycled are glass, plastic, newspapers, aluminum cans, used motor oil, and batteries. Here, reduce refers to lessening the amount of items or resources that are consumed, using only the amount that is needed, and looking for alternatives that will lessen our use. And reuse means extending the 'life' or repurposing an item rather than discarding or throwing it away. Harder – Recycling is the processes of collecting, processing, remanufacturing, and reusing materials instead of discarding them. This helps conserve raw materials and energy that manufacturers would otherwise use in producing new products. Recycling also reduces the amount of material going into landfills. Recycling helps lessen the pollution that may result from waste disposal. Reducing our consumption of materials and reducing the waste of materials also adds to the conservation of our resources. Disponível em: Acesso em: abr. 2011.