Para uma solução de um ácido fraco genérico de fórmula HX, que apresenta
concentração inicial de 0,1 mol∙L-1 e grau de ionização de 2 %, sua respectiva
constante Ka, medida a uma dada temperatura T, é de aproximadamente
Leia o fragmento de reportagem.
O presidente dos Estados Unidos, Donald Trump, designou oficialmente o Brasil como aliado militar preferencial do país fora da Organização do Tratado do Atlântico Norte (OTAN).
[...] O status dá ao Brasil o direito de tornar-se comprador preferencial de equipamentos e tecnologias militares dos Estados Unidos, além de participar de leilões organizados pelo Pentágono. A medida também abre caminho para a colaboração no desenvolvimento de soluções de defesa e o aumento dos intercâmbios militares e a realização de manobras conjuntas entre as Forças Armadas dos dois países.
Estados Unidos designam Brasil como aliado extra-Otan. Agência Brasil, 01 ago. 2019.
Disponível em: <http://agenciabrasil.ebc.com.br/internacional/noticia/2019-08/estados-unidos-designam-oficialmente-brasil-como-aliado-extra-otan>Acesso em 29 set. 2019.
Com base nas informações acima e em seus conhecimentos sobre o assunto abordado, assinale a alternativa correta.
Se cos x = 1/2, então o valor do cos 2x é igual a
“A história de todas as sociedades até agora tem sido a história das
lutas de classe. Homem livre e escravo, patrício e plebeu, barão e servo,
membros das corporações e aprendiz, em suma, opressores e oprimidos,
estiveram em contraposição uns aos outros e envolvidos em uma luta
ininterrupta, ora disfarçada, ora aberta, que terminou sempre com a
transformação revolucionária da sociedade inteira ou com o declínio
conjunto das classes em conflito.”
Trecho do Manifesto do Partido Comunista de Karl Marx e Friedrich Engels – 1848
Sobre o contexto histórico e as propostas de Marx e Engels considere as seguintes afirmações:
I. O Manifesto do Partido Comunista foi escrito às vésperas das Revoluções de 1848, as quais abalaram os setores mais conservadores da Europa, preocupada em barrar o avanço das transformações iniciadas com a Revolução Francesa de 1789. II. Assim como em 1871 na Comuna de Paris; em 1848, a classe operária europeia tornara-se protagonista nos movimentos revolucionários críticos do modelo capitalista e da sua exploração do trabalho. III. Conhecida como a Primavera dos Povos, as Revoluções de 1848 uniram anarquistas, comunistas e socialistas em torno de um projeto essencialmente marxista, culminando em ações revolucionárias nas principais capitais europeias. IV. Na construção de sua teoria, Marx e Engels reapropriam-se criticamente da filosofia alemã, em especial Hegel, das reflexões dos socialistas utópicos, da teoria econômica inglesa e da prática política dos movimentos sociais e operários europeus.
Trecho do Manifesto do Partido Comunista de Karl Marx e Friedrich Engels – 1848
Sobre o contexto histórico e as propostas de Marx e Engels considere as seguintes afirmações:
I. O Manifesto do Partido Comunista foi escrito às vésperas das Revoluções de 1848, as quais abalaram os setores mais conservadores da Europa, preocupada em barrar o avanço das transformações iniciadas com a Revolução Francesa de 1789. II. Assim como em 1871 na Comuna de Paris; em 1848, a classe operária europeia tornara-se protagonista nos movimentos revolucionários críticos do modelo capitalista e da sua exploração do trabalho. III. Conhecida como a Primavera dos Povos, as Revoluções de 1848 uniram anarquistas, comunistas e socialistas em torno de um projeto essencialmente marxista, culminando em ações revolucionárias nas principais capitais europeias. IV. Na construção de sua teoria, Marx e Engels reapropriam-se criticamente da filosofia alemã, em especial Hegel, das reflexões dos socialistas utópicos, da teoria econômica inglesa e da prática política dos movimentos sociais e operários europeus.
A expansão da civilização romana e a conquista do Mediterrâneo, se por um
lado trouxeram riquezas e poderio à Roma; por outro lado, provocou um conflito
entre as antigas instituições políticas, frente à nova realidade social e econômica
dos romanos. Isso se deve
Read the text below and answer question
Is it really possible that plant-based foods such as the Impossible Whopper are healthful?
ByCara Rosenbloom September9, 2019
With many American consumers interested in reducing their consumption of animal products without becoming vegetarian or vegan, the food industry has come up with a new craze: plant-based. Look around your grocery store, and you’ll see a growing number of dairy, egg and meat substitutes bearing this label.
But the industry has taken liberties with the definition of “plant-based.” Rather than focusing on whole foods such as vegetables, fruits, legumes and nuts, which is what health professionals mean when they recommend “plant-based eating,” food manufacturers are developing ultra-processed burgers out of pea or soy protein, methylcellulose and maltodextrin, and liquid “eggs” out of mung bean protein isolate and gellan gum. Then they crown this ultra-processed food with an undeserved health halo.
(…)
Plant-based ultra-processed products such as these are formulated to taste like the real deal. Thus, consumers can feel virtuous or principled for choosing plants over meat without sacrificing too much flavor. But is there any value to plant-based products that have been crushed, extruded and shaped into facsimiles of the foods they are replacing? Let’s look at that question through several lenses — considering nutrients, how processed the food is and how producing the food affects the planet.
When I was in nutrition school, the health value of food was mostly calculated based on the presence of desirable nutrients, such as fiber and vitamins, and on the absence of negative nutrients, such as sodium or trans fat. If you compare ultra-processed plant-based foods and similar animal-based foods solely on their nutrients, you’ll find they are roughly the same.
Plant-based foods are purposely formulated to mimic animal-based foods, so plant-based milk is enriched with calcium and vitamin D to mimic cow’s milk, while veggie burgers are rich in protein and made with iron and zinc to imitate beef. But they aren’t always made to reduce the presence of less-healthy nutrients. Sometimes, the processed plant-based food will have more sodium than the processed animal-based food, and sometimes the animal food will be higher in calories or saturated fat.
(…)
Using the term “plant-based” on fast food labels is just another attempt by marketers to re-brand junk food. True plant-based eating doesn’t mean opting for an Impossible Whopper in the drive-through or scrambling up some 15-ingredient “egg alternative.” It means a diet that includes nourishing options such as black beans, broccoli and brown rice. We’re always looking for some magical way to eat junky food and achieve health. Don’t be fooled by this plant-based pretense.
Adapted from the digital edition ofThe Washington Post: www.washingtonpost.com
Choose the INCORRECT alternative, according to the text:
Read the text below and answer question
Is it really possible that plant-based foods such as the Impossible Whopper are healthful?
ByCara Rosenbloom September9, 2019
With many American consumers interested in reducing their consumption of animal products without becoming vegetarian or vegan, the food industry has come up with a new craze: plant-based. Look around your grocery store, and you’ll see a growing number of dairy, egg and meat substitutes bearing this label.
But the industry has taken liberties with the definition of “plant-based.” Rather than focusing on whole foods such as vegetables, fruits, legumes and nuts, which is what health professionals mean when they recommend “plant-based eating,” food manufacturers are developing ultra-processed burgers out of pea or soy protein, methylcellulose and maltodextrin, and liquid “eggs” out of mung bean protein isolate and gellan gum. Then they crown this ultra-processed food with an undeserved health halo.
(…)
Plant-based ultra-processed products such as these are formulated to taste like the real deal. Thus, consumers can feel virtuous or principled for choosing plants over meat without sacrificing too much flavor. But is there any value to plant-based products that have been crushed, extruded and shaped into facsimiles of the foods they are replacing? Let’s look at that question through several lenses — considering nutrients, how processed the food is and how producing the food affects the planet.
When I was in nutrition school, the health value of food was mostly calculated based on the presence of desirable nutrients, such as fiber and vitamins, and on the absence of negative nutrients, such as sodium or trans fat. If you compare ultra-processed plant-based foods and similar animal-based foods solely on their nutrients, you’ll find they are roughly the same.
Plant-based foods are purposely formulated to mimic animal-based foods, so plant-based milk is enriched with calcium and vitamin D to mimic cow’s milk, while veggie burgers are rich in protein and made with iron and zinc to imitate beef. But they aren’t always made to reduce the presence of less-healthy nutrients. Sometimes, the processed plant-based food will have more sodium than the processed animal-based food, and sometimes the animal food will be higher in calories or saturated fat.
(…)
Using the term “plant-based” on fast food labels is just another attempt by marketers to re-brand junk food. True plant-based eating doesn’t mean opting for an Impossible Whopper in the drive-through or scrambling up some 15-ingredient “egg alternative.” It means a diet that includes nourishing options such as black beans, broccoli and brown rice. We’re always looking for some magical way to eat junky food and achieve health. Don’t be fooled by this plant-based pretense.
Adapted from the digital edition ofThe Washington Post: www.washingtonpost.com
According to the text, choose the correct alternative:
As rochas são os materiais fundamentais na formação da litosfera. Elas
são levantadas, comprimidas e deformadas por grandes forças tectônicas
originárias do manto inferior e da astenosfera. Na superfície, as rochas
são desgastadas por intemperismo e erodidas para ser depositadas como
sedimento em outros lugares. [...] Geólogos distinguem três categorias
principais de rochas com base no modo de formação: ígneas, sedimentares
e metamórficas.
PETERSEN, SACK e GABLER. Fundamentos de Geografia Física. São Paulo: Cengage Learning, 2014, p.243-249.
Com base nas informações acima e nos seus conhecimentos sobre as rochas, analise as afirmações a seguir.
I. Quando o material rochoso fundido se resfria e se solidifica, torna-se uma rocha ígnea. A rocha derretida que está abaixo da superfície da Terra é chamada magma, e o material de rocha derretida na superfície é conhecido especificamente como lava. II. As rochas sedimentares são derivadas de sedimentos acumulados, ou seja, materiais minerais não consolidados que foram erodidos, transportados e depositados. Existem três categorias principais de rochas sedimentares: clásticas, orgânicas e químicas. III. O enorme calor e a pressão nas profundezas da crosta da Terra podem transformar (metamorfosear) uma rocha existente em um novo tipo de rocha completamente diferente do original, recristalizando os minerais, sem que haja o uso de mais matéria rochosa derretida.
É correto o que se afirma em
PETERSEN, SACK e GABLER. Fundamentos de Geografia Física. São Paulo: Cengage Learning, 2014, p.243-249.
Com base nas informações acima e nos seus conhecimentos sobre as rochas, analise as afirmações a seguir.
I. Quando o material rochoso fundido se resfria e se solidifica, torna-se uma rocha ígnea. A rocha derretida que está abaixo da superfície da Terra é chamada magma, e o material de rocha derretida na superfície é conhecido especificamente como lava. II. As rochas sedimentares são derivadas de sedimentos acumulados, ou seja, materiais minerais não consolidados que foram erodidos, transportados e depositados. Existem três categorias principais de rochas sedimentares: clásticas, orgânicas e químicas. III. O enorme calor e a pressão nas profundezas da crosta da Terra podem transformar (metamorfosear) uma rocha existente em um novo tipo de rocha completamente diferente do original, recristalizando os minerais, sem que haja o uso de mais matéria rochosa derretida.
É correto o que se afirma em
Read the text and answer question
How to Make Friends While Traveling Solo
Even in the best cases, traveling alone can get lonely. Here’s how to connect safely with the people you meet along the way.
By Aric Jenkins April 16, 2019
Experiencing another culture on your own terms, at your own pace, with a budget of your own choosing can be an incredibly rewarding and insightful adventure. But while some may find such a journey liberating, others might worry about safety or a period of solitude in a strange, unfamiliar place. Humans, after all, are social animals.
Prospective solo travelers should know that, despite its label, solo travel does not have to mean you’re alone all the time. There are local communities to safely interact with as well as fellow globe-trotters in a similar position.
A 2016 report from travel research company Phocuswright found that a whopping 72 percent of hostel guests in the United States were traveling alone. Airbnb saw similar a trend in its data, with cities like Ho Chi Minh City, Cologne, and Johannesburg experiencing more than a 130 percent increase in individual bookings in 2016.
With solo traveling growing in popularity, it’s clear there are options to socialize with other travelers — it’s just a matter of putting yourself in the right position to do so. Here are some tactics you can use to meet and befriend people abroad, from tried-and-true methods to innovative new apps and technology.
Go on ‘free’ walking tours
The word free is in quotations because, assuming your tour guide is at least half-decent, you should tip them at the end (many earn the majorityof their income on commission). But these walking tours can be worth every penny. Not only will the guide give you an informed and hopefully entertaining view of the locale, but you’ll have a chance to interact with other tourists and possibly come away with a new friend.
(…)
Use Airbnb to go on unique experiences hosted by locals
Airbnb may be known more for its lodging arrangements, but it also wants to give you something to do at your destination. Airbnb Experiences connects travelers with local guides who lead guests on paid activities ranging from city tours to bar crawls and hobby and skill classes. Launched in late 2016, Experiences quickly became a popularfeature.
Connect with like-minded explorers on social travel apps
Prefer to cut out the middleman and connect directly with other travelers? Try your hand at the crop of social networking apps specifically designed for travel. Travello, free on iOS and Android, allows you to discover other travelersnearby, match itineraries for planned trips and join groups based on similar interests. You can also create a feed by posting photos and updates.
(…)
Stay in hostels
In a world of hospitable hotels and authentic Airbnbs, why do travelers elect to stay in hostels? Two reasons, really: Hostels are cheap and sociable. You’ll find college-esque dormitories with common lounge rooms and kitchens, and sometimes a bar or cafe.
It’s an idealenvironmentto meet other travelers, and hostel staffs are well aware of this — some will lead city tours or pub crawls designed to foster interaction between hostel mates. Others might host game nights in the common room or arrange family dinners.
(…)
Adapted from the digital edition of The New York Times: www.nytimes.com
According to the article, choose the correct alternative.
I. Walking tours are free because you don’t have to pay anything for them. II. Airbnb Experiences also provides a way to interact with people through a local guest. III. Social Travels Apps can connect you to local people so that they can help you plan your trips and join local groups.
I. Walking tours are free because you don’t have to pay anything for them. II. Airbnb Experiences also provides a way to interact with people through a local guest. III. Social Travels Apps can connect you to local people so that they can help you plan your trips and join local groups.