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Texto 1
LANDFILLS AND THE INTRODUCTION OF NANOMATERIALS IN WASTE
Waste disposal on land (dumping) and landfilling remain the most prominent waste management techniques used ______. The standards and practices for this type of waste disposal vary greatly ranging from uncontrolled sites to highly specialised and controlled engineered landfills. The potential ______ of contaminants through landfill gas and leachate is largely dependent on landfill design, site conditions and the sophistication of the control measures in place, ______ landfill gas recovery and leachate collection and treatment systems.
Modern engineered landfills use ______ barriers, with few relying on natural barriers, to line the bottom of a landfill and incorporate collection systems for both leachate and landfill gas. The purpose of these collection systems is to capture and treat leachate and landfill gas; ______ preventing the migration of leachate into ground/surface water and the release of untreated landfill gases to the atmosphere. An un-engineered landfill would be considered an uncontrolled system due to the lack of environmental controls, potentially resulting in significant environmental exposure of contaminants.
Because of widespread use of ENMs in a broad range of products, it is possible that some ENMs ______ through landfill gases; however this report will primarily focus on ENMs that may be present in landfill leachate, as this is considered to be the primary means by which ENMs could be transported______ a landfill. Characterisation of landfill gases to identify the presence of ENMs ______ an important area for further research.
Landfill leachate is generated when rain passes through the waste mass and by the liquid generated due to the breakdown of waste ______ the landfill. The composition of leachate is extremely ______ depending on the type of waste landfilled, the quantity of precipitation, the construction and operation of the landfill, the age of the landfill and other factors such as pH, temperature and microbial populations.
(…)
ENMs = engineered nanomaterials.
Organisation for Economic Co-operation and Development. Landfills and the introduction of
nanomaterials in waste. In: Landfilling of waste containing nanomaterials and nanowaste, 2015.
Disponível em:
Texto 1
LANDFILLS AND THE INTRODUCTION OF NANOMATERIALS IN WASTE
Waste disposal on land (dumping) and landfilling remain the most prominent waste management techniques used ______. The standards and practices for this type of waste disposal vary greatly ranging from uncontrolled sites to highly specialised and controlled engineered landfills. The potential ______ of contaminants through landfill gas and leachate is largely dependent on landfill design, site conditions and the sophistication of the control measures in place, ______ landfill gas recovery and leachate collection and treatment systems.
Modern engineered landfills use ______ barriers, with few relying on natural barriers, to line the bottom of a landfill and incorporate collection systems for both leachate and landfill gas. The purpose of these collection systems is to capture and treat leachate and landfill gas; ______ preventing the migration of leachate into ground/surface water and the release of untreated landfill gases to the atmosphere. An un-engineered landfill would be considered an uncontrolled system due to the lack of environmental controls, potentially resulting in significant environmental exposure of contaminants.
Because of widespread use of ENMs in a broad range of products, it is possible that some ENMs ______ through landfill gases; however this report will primarily focus on ENMs that may be present in landfill leachate, as this is considered to be the primary means by which ENMs could be transported______ a landfill. Characterisation of landfill gases to identify the presence of ENMs ______ an important area for further research.
Landfill leachate is generated when rain passes through the waste mass and by the liquid generated due to the breakdown of waste ______ the landfill. The composition of leachate is extremely ______ depending on the type of waste landfilled, the quantity of precipitation, the construction and operation of the landfill, the age of the landfill and other factors such as pH, temperature and microbial populations.
(…)
ENMs = engineered nanomaterials.
Organisation for Economic Co-operation and Development. Landfills and the introduction of
nanomaterials in waste. In: Landfilling of waste containing nanomaterials and nanowaste, 2015.
Disponível em:
Texto 1
LANDFILLS AND THE INTRODUCTION OF NANOMATERIALS IN WASTE
Waste disposal on land (dumping) and landfilling remain the most prominent waste management techniques used ______. The standards and practices for this type of waste disposal vary greatly ranging from uncontrolled sites to highly specialised and controlled engineered landfills. The potential ______ of contaminants through landfill gas and leachate is largely dependent on landfill design, site conditions and the sophistication of the control measures in place, ______ landfill gas recovery and leachate collection and treatment systems.
Modern engineered landfills use ______ barriers, with few relying on natural barriers, to line the bottom of a landfill and incorporate collection systems for both leachate and landfill gas. The purpose of these collection systems is to capture and treat leachate and landfill gas; ______ preventing the migration of leachate into ground/surface water and the release of untreated landfill gases to the atmosphere. An un-engineered landfill would be considered an uncontrolled system due to the lack of environmental controls, potentially resulting in significant environmental exposure of contaminants.
Because of widespread use of ENMs in a broad range of products, it is possible that some ENMs ______ through landfill gases; however this report will primarily focus on ENMs that may be present in landfill leachate, as this is considered to be the primary means by which ENMs could be transported______ a landfill. Characterisation of landfill gases to identify the presence of ENMs ______ an important area for further research.
Landfill leachate is generated when rain passes through the waste mass and by the liquid generated due to the breakdown of waste ______ the landfill. The composition of leachate is extremely ______ depending on the type of waste landfilled, the quantity of precipitation, the construction and operation of the landfill, the age of the landfill and other factors such as pH, temperature and microbial populations.
(…)
ENMs = engineered nanomaterials.
Organisation for Economic Co-operation and Development. Landfills and the introduction of
nanomaterials in waste. In: Landfilling of waste containing nanomaterials and nanowaste, 2015.
Disponível em:
Considere a reação, em equilíbrio, de produção do alvejante gasoso dióxido de cloro, que ocorre em um sistema reacional:
Cl2(g) + 2 NaClO2(s) ⇄ 2 ClO2(g) + 2 NaCl(s)
Nessa situação, assinale a alternativa correta.
“A Olimpíada deve ser disputada sem o fantasma da fraude química, dentro do princípio de que, tanto quanto é importante competir, vencer é prova de competência”. (Jornal “O Globo”, 28/05/2016)
Considere que um atleta tenha consumido 64 mg de um anabolizante e que, após 4 dias, o exame antidoping tenha detectado apenas 0,25 mg deste composto. Assumindo que a degradação do anabolizante no organismo segue uma cinética de 1ª ordem, assinale a alternativa que apresenta o tempo de meia-vida da substância no organismo do atleta.
Uma empresa de galvanoplastia produz peças especiais recobertas com zinco. Sabendo que cada peça recebe 7 g de Zn, que é utilizada uma corrente elétrica de 0,7 A e que a massa molar do zinco é igual a 65 g/mol, qual o tempo necessário para o recobrimento dessa peça especial?
(Constante de Faraday: 1 F = 96500 C.mol−1 )
"If we lived on a planet where nothing ever changed, there would be little to do. There would be nothing to figure out. There would be no impetus for science. And if we lived in an unpredictable world, where things changed in random or very complex ways, we would not be able to figure things out. ___________________________. If I throw a stick up in the air, it always falls down. If the sun sets in the west, it always rises again the next morning in the east. And so it becomes possible to figure things out. We can do science, and with it we can improve our lives."
Carl Sagan, http://todayinsci.com/S/Sagan_Carl/SaganCarl-Quotations.htm Acessado em 14 de Abril de 2015.
Text 2
MATERIALS OF IMPORTANCE
Carbonated Beverages Containers
One common item that presents some interesting material property requirements is the container for carbonated beverages. The material used for this application must satisfy the following constraints: provide a barrier to the passage of carbon dioxide, which is under pressure in the container; be nontoxic, unreactive with the beverage, and, preferably be recyclable; be relatively strong, and capable of surviving a drop from a height of several feet when containing the beverage; be inexpensive and the cost to fabricate the final shape should be relatively low; if optically transparent, retain its optical clarity; and capable of being produced having different colors and/or able to be adorned with decorative labels. All three of the basic material types—metal (aluminum), ceramic (glass), and polymer (polyester plastic)—are used for carbonated beverage containers.
All of these materials are nontoxic and unreactive with beverages. In addition, each material has its pros and cons. For example, the aluminum alloy is relatively strong (but easily dented), is a very good barrier to the diffusion of carbon dioxide, is easily recycled, beverages are cooled rapidly, and labels may be painted onto its surface. On the other hand, the cans are optically opaque, and relatively expensive to produce. Glass is impervious to the passage of carbon dioxide, is a relatively inexpensive material, may be recycled, but it cracks and fractures easily, and glass bottles are relatively heavy. Whereas the plastic is relatively strong, may be made optically transparent, is inexpensive and lightweight, and is recyclable, it is not as impervious to the passage of carbon dioxide as the aluminum and glass. For example, you may have noticed that beverages in aluminum and glass containers retain their carbonization (i.e., “fizz”) for several years, whereas those in two-liter plastic bottles “go flat” within a few months.
Disponível em
https://onedrive.live.com/view.aspx?resid=FA116F188700E8B6!608&ithint=file%2cpdf&app=WordPdf&authkey=!AcrrQAFlJ83JGjU Acesso em 15 Abr 2015.
Water: Unclogging the finance
How to improve water systems is one challenge; financing them is another. Public authorities in most countries play the main role in implementing and funding water infrastructure, but it is a model that is under increasing pressure, with government budgets and banks still prudent about issuing credit.
There is no generic funding model that can be applied to every need; the sheer diversity of water infrastructures and sources of financing to be identified, scanned and tapped in line with particular investment types and needs.
There may be small-scale projects initiated by local entrepreneurs, or large infrastructures that serve multiple, such as energy and heavy manufacturing. Some investments may involve green ecosystems to supply, store or filter water.
Not only will these infrastructures have different financing needs, but will access funds in different ways, for instance through capital markets, loans, funds, public expenditures, etc.
Take large dams and large reservoirs. These are costly, long-term affairs. The Three Gorges Dam project in China, for instance, could cost over US$22 billion, according to government, including construction, relocation of residents and financing costs.
Moreover, cost recovery is not expected to occur for 10 years after full operation starts. Such major projects tend to be financed major development banks such as the Asian Development Bank and World Bank, and institutional investors such as pension funds. The sources for long-term financing are expanding, with the emergence of sovereign funds and philanthropists, of new groups like the Chinese-led Asian Infrastructure Investment Bank, opened in March 2015.
But before leaping into major such as dams, policymakers must answer several questions. Will the construction lock them in and still be valuable in 25, 50 or 100 years’ time? After all, there are several cases of investments that have fallen into disuse or underuse, such as a desalination in Sydney that was built during a severe but temporary drought, and dams in France’s Loire Valley that are now being decommissioned at some cost. Had a more forwardprobing “value options” approach been used in planning them, they _________ in the first place. ( . . . )
Disponível em http://www.oecdobserver.org/news/fullstory.php/aid/4825/ Water:_Unclogging_the_finance.html#sthash.kRhyDJ1.dpuf Acesso em 16 Abr 2015.
PARA A QUESTÃO, ESCOLHA A ALTERNATIVA QUE COMPLETA O TEXTO 1 CORRETAMENTE.
Water: Unclogging the finance
How to improve water systems is one challenge; financing them is another. Public authorities in most countries play the main role in implementing and funding water infrastructure, but it is a model that is under increasing pressure, with government budgets and banks still prudent about issuing credit.
There is no generic funding model that can be applied to every need; the sheer diversity of water infrastructures and sources of financing to be identified, scanned and tapped in line with particular investment types and needs.
There may be small-scale projects initiated by local entrepreneurs, or large infrastructures that serve multiple, such as energy and heavy manufacturing. Some investments may involve green ecosystems to supply, store or filter water.
Not only will these infrastructures have different financing needs, but will access funds in different ways, for instance through capital markets, loans, funds, public expenditures, etc.
Take large dams and large reservoirs. These are costly, long-term affairs. The Three Gorges Dam project in China, for instance, could cost over US$22 billion, according to government, including construction, relocation of residents and financing costs.
Moreover, cost recovery is not expected to occur for 10 years after full operation starts. Such major projects tend to be financed major development banks such as the Asian Development Bank and World Bank, and institutional investors such as pension funds. The sources for long-term financing are expanding, with the emergence of sovereign funds and philanthropists, of new groups like the Chinese-led Asian Infrastructure Investment Bank, ________ opened in March 2015.
But before leaping into major such as dams, policymakers must answer several questions. Will the construction lock them in and still be valuable in 25, 50 or 100 years’ time? After all, there are several cases of investments that have fallen into disuse or underuse, such as a desalination in Sydney that was built during a severe but temporary drought, and dams in France’s Loire Valley that are now being decommissioned at some cost. Had a more forwardprobing “value options” approach been used in planning them, they in the first place. ( . . . )
Disponível em http://www.oecdobserver.org/news/fullstory.php/aid/4825/ Water:_Unclogging_the_finance.html#sthash.kRhyDJ1.dpuf Acesso em 16 Abr 2015.
PARA A QUESTÃO, ESCOLHA A ALTERNATIVA QUE COMPLETA O TEXTO 1 CORRETAMENTE.
Water: Unclogging the finance
How to improve water systems is one challenge; financing them is another. Public authorities in most countries play the main role in implementing and funding water infrastructure, but it is a model that is under increasing pressure, with government budgets and banks still prudent about issuing credit.
There is no generic funding model that can be applied to every need; the sheer diversity of water infrastructures and sources of financing to be identified, scanned and tapped in line with particular investment types and needs.
There may be small-scale projects initiated by local entrepreneurs, or large infrastructures that serve multiple, such as energy and heavy manufacturing. Some investments may involve green ecosystems to supply, store or filter water.
Not only will these infrastructures have different financing needs, but will access funds in different ways, for instance through capital markets, loans, funds, public expenditures, etc.
Take large dams and large reservoirs. These are costly, long-term affairs. The Three Gorges Dam project in China, for instance, could cost over US$22 billion, according to government , including construction, relocation of residents and financing costs.
Moreover, cost recovery is not expected to occur for 10 years after full operation starts. Such major projects tend to be financed ________ major development banks such as the Asian Development Bank and World Bank, and institutional investors such as pension funds. The sources for long-term financing are expanding, with the emergence of sovereign funds and philanthropists, of new groups like the Chinese-led Asian Infrastructure Investment Bank, opened in March 2015.
But before leaping into major such as dams, policymakers must answer several questions. Will the construction lock them in and still be valuable in 25, 50 or 100 years’ time? After all, there are several cases of investments that have fallen into disuse or underuse, such as a desalination in Sydney that was built during a severe but temporary drought, and dams in France’s Loire Valley that are now being decommissioned at some cost. Had a more forwardprobing “value options” approach been used in planning them, they in the first place. ( . . . )
Disponível em http://www.oecdobserver.org/news/fullstory.php/aid/4825/ Water:_Unclogging_the_finance.html#sthash.kRhyDJ1.dpuf Acesso em 16 Abr 2015.
PARA A QUESTÃO, ESCOLHA A ALTERNATIVA QUE COMPLETA O TEXTO 1 CORRETAMENTE.
Water: Unclogging the finance
How to improve water systems is one challenge; financing them is another. Public authorities in most countries play the main role in implementing and funding water infrastructure, but it is a model that is under increasing pressure, with government budgets and banks still prudent about issuing credit.
There is no generic funding model that can be applied to every need; the sheer diversity of water infrastructures and sources of financing to be identified, scanned and tapped in line with particular investment types and needs.
There may be small-scale projects initiated by local entrepreneurs, or large infrastructures that serve multiple , such as energy and heavy manufacturing. Some investments may involve green ecosystems to supply, store or filter water.
Not only will these infrastructures have different financing needs, but will access funds in different ways, for instance through capital markets, loans, funds, public expenditures, etc.
Take large dams and large reservoirs. These are costly, long-term affairs. The Three Gorges Dam project in China, for instance, could cost over US$22 billion, according to government ________, including construction, relocation of residents and financing costs.
Moreover, cost recovery is not expected to occur for 10 years after full operation starts. Such major projects tend to be financed major development banks such as the Asian Development Bank and World Bank, and institutional investors such as pension funds. The sources for long-term financing are expanding, with the emergence of sovereign funds and philanthropists, of new groups like the Chinese-led Asian Infrastructure Investment Bank, opened in March 2015.
But before leaping into major such as dams, policymakers must answer several questions. Will the construction lock them in and still be valuable in 25, 50 or 100 years’ time? After all, there are several cases of investments that have fallen into disuse or underuse, such as a desalination in Sydney that was built during a severe but temporary drought, and dams in France’s Loire Valley that are now being decommissioned at some cost. Had a more forwardprobing “value options” approach been used in planning them, they in the first place. ( . . . )
Disponível em http://www.oecdobserver.org/news/fullstory.php/aid/4825/ Water:_Unclogging_the_finance.html#sthash.kRhyDJ1.dpuf Acesso em 16 Abr 2015.
PARA A QUESTÃO, ESCOLHA A ALTERNATIVA QUE COMPLETA O TEXTO 1 CORRETAMENTE.
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