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58.062 questões encontradas. Mostrando a página 2747 de 2904.

• 97C2E794-BA

  Português

  Interpretação de TextosUniversidade do Estado da Bahia · 2009DifícilEntre para guardar nos favoritos

        A população com 12 anos ou mais de estudo, entre 1995 e 2005, praticamente dobrou e a frequência ao ensino superior neste período quase triplicou. Esse aumento ocorreu particularmente na população feminina, que atualmente é maioria nas universidades e corresponde a 56,1% da população com 12 anos ou mais de estudo. No entanto, é nesse grupo de maior escolaridade que a desigualdade de rendimento entre homens e mulheres é elevada.

       A população masculina ocupada, com 12 anos ou mais de estudo, está distribuída entre os seguintes grupamentos de atividades: indústria (15,8%), comércio e reparação (15,6%), educação, saúde e serviços sociais (16,8%) e outras atividades (22,3%). No caso das mulheres com esse nível de escolaridade, 44,9% estão no grupamento de educação, saúde e serviços sociais. Em resumo, as mulheres estão predominantemente no setor de serviços, em atividades relacionadas ao cuidado, em áreas que poderiam ser consideradas extensões das atribuições familiares e domésticas.                       

       Independentemente da maior escolaridade das mulheres, a inserção delas em “nichos” ocupacionais tipicamente femininos faz com que ganhem menos que os homens, o que explica, em parte, a desigualdade de rendimento por sexo.

  
  

  FIGUEIRA, Mara. Retrato de um mundo desigual. Sociologia: ciência da vida, São Paulo: Escala, ano 1, n. 6, p. 14, 2007.

  
  

  
  

  Ao mencionar os índices da pesquisa do IBGE no texto, a articulista evidencia que

  Escolha uma alternativa para a questão 97c2e794-ba

  A

  as mudanças culturais no âmbito familiar são ainda insignificantes.

  B

  o preconceito contra as mulheres persiste, mesmo no ensino superior.

  C

  homens e mulheres se encontram em condições de igualdade no mercado de trabalho voltado para a prestação de serviços.

  D

  o fato de as mulheres não brancas terem salários mais baixos que as mulheres brancas é devido à diferença de nível cultural.

  E

  o espaço feminino, no ensino superior, traduz uma mudança do papel tradicional do gênero na sociedade.

  Responder
• 97BE674C-BA

  Português

  Interpretação de TextosUniversidade do Estado da Bahia · 2009FácilEntre para guardar nos favoritos

  

  Sobre o texto, é correto afirmar:

  Escolha uma alternativa para a questão 97be674c-ba

  A

  O fragmento “Sartre não apenas confessa essas leituras, mas defende-as com lucidez e inteligência.” (l. 23-24) é constituído de duas afirmações que se contradizem.

  B

  O período “Periodicamente, volto ao livro, nem sei por quê.” (l. 18) é revelador da insegurança do enunciador em relação aos seus objetivos de vida.

  C

  A forma verbal “teria sido” (l. 17) exprime uma ideia de probabilidade no passado.

  D

  A afirmação “a criança diante da vida é uma constante de medo, encantamento e velhacaria.” (l. 12-13) sintetiza o preconceito do enunciador contra livros de memórias.

  E

  O fragmento “Lendo suas recordações” (l. 9) constitui uma explicação para o que o enunciador expõe a seguir, na frase.

  Responder
• 97BA3340-BA

  Português

  Interpretação de TextosUniversidade do Estado da Bahia · 2009MédioEntre para guardar nos favoritos

  

  Com base no texto, está correto o que se afirma em

  Escolha uma alternativa para a questão 97ba3340-ba

  A

  O texto, em sua totalidade, é tecido a partir dos discursos de Sartre e Renan, contrapondo suas ideias.

  B

  A avaliação contida em “às vezes dramática” (l. 6-7) traz uma referência direta à infância do articulista.

  C

  O livro “As palavras” (l. 3), segundo Cony, é uma narrativa de denúncia social

  D

  A expressão “pequeno livro grande” (l. 3) apresenta um processo de adjetivação do nome em que aspectos qualitativos — intelectivo e afetivo — estão presentes.

  E

  A frase “Foi bom reler Sartre, que anda meio fora da moda.” (l. 1), sem alterar a sua semântica, pode ser reescrita como Foi bom reler Sartre, o que anda meio fora da moda.

  Responder
• 0819E60C-B6

  Inglês

  Interpretação de texto | Reading comprehensionUECE · 2009DifícilEntre para guardar nos favoritos

  TEXT

      One reason growth forecasts for rich nations are so grim is the common assumption that birth rates are falling. Fewer people will produce less income, and shrinking economies. Only the assumption of aging populations may be wrong, according to a recent report by Goldman Sachs that looks at key demographic trends for the 21st century.

      Since bottoming out in 2001, fertility rates in a number of developed economies have actually been on the rise. Among rich economies, the jump is most pronounced in places like the United Kingdom, France, Spain, and the U.S. Larger immigrant populations in these nations have something to do with this, as they tend to have more children. Yet the effect is only short term, as migrants adopt the fertility rates of their new homes within a generation or so.

      Goldman’s new analysis shows that another reason for the unexpected jump, and one that will play a bigger role in the future, is that women in rich countries have been having children later and later in life, something that traditional economic models don’t account for. Standard estimates of fertility are still tabulated assuming that most women are having children in their early 20s, rather than late 20s or even 30s and 40s, as has become more common in rich countries with lots of women in the workforce. “In parts of Europe (this method of calculation) has probably understated true fertility by about 15 to 20 percent,” notes Goldman Sachs economist Peter Berezin.

      Those are big numbers, with potentially very significant ramifications. For starters, it could be that some of the problems faced by aging nations with shrinking tax bases (like, for example, overblown health-care spending, crumbling infrastructure, and budget shortfalls) may not be quite as bad as once envisioned. In fact, there is some evidence to suggest that we may soon start seeing mini baby booms, which, in 20 years or so, could have a significant impact on the size of rich nations’ workforces, a shift that can’t come too soon for countries now struggling with unprecedented levels of national debt. Another bright spot – recent surveys by Eurobarometer show that European women between the ages of 25 and 39 want to have more children, if only it were easier to find a better work-life balance. Note to European leaders: stop worrying about the effects of immigration and start creating better-paid part-time work.

  Newsweek, September 28, 2009

  A piece of advice suggested in the text is that

  Escolha uma alternativa para a questão 0819e60c-b6

  A

  people in developed countries should adopt children from poor countries

  B

  more money should be invested in nuclear plants

  C

  more part-time jobs with better salaries should be created in Europe

  D

  women should not give birth in their 40s

  Responder
• 0814EE90-B6

  Inglês

  Interpretação de texto | Reading comprehensionUECE · 2009FácilEntre para guardar nos favoritos

  TEXT

      One reason growth forecasts for rich nations are so grim is the common assumption that birth rates are falling. Fewer people will produce less income, and shrinking economies. Only the assumption of aging populations may be wrong, according to a recent report by Goldman Sachs that looks at key demographic trends for the 21st century.

      Since bottoming out in 2001, fertility rates in a number of developed economies have actually been on the rise. Among rich economies, the jump is most pronounced in places like the United Kingdom, France, Spain, and the U.S. Larger immigrant populations in these nations have something to do with this, as they tend to have more children. Yet the effect is only short term, as migrants adopt the fertility rates of their new homes within a generation or so.

      Goldman’s new analysis shows that another reason for the unexpected jump, and one that will play a bigger role in the future, is that women in rich countries have been having children later and later in life, something that traditional economic models don’t account for. Standard estimates of fertility are still tabulated assuming that most women are having children in their early 20s, rather than late 20s or even 30s and 40s, as has become more common in rich countries with lots of women in the workforce. “In parts of Europe (this method of calculation) has probably understated true fertility by about 15 to 20 percent,” notes Goldman Sachs economist Peter Berezin.

      Those are big numbers, with potentially very significant ramifications. For starters, it could be that some of the problems faced by aging nations with shrinking tax bases (like, for example, overblown health-care spending, crumbling infrastructure, and budget shortfalls) may not be quite as bad as once envisioned. In fact, there is some evidence to suggest that we may soon start seeing mini baby booms, which, in 20 years or so, could have a significant impact on the size of rich nations’ workforces, a shift that can’t come too soon for countries now struggling with unprecedented levels of national debt. Another bright spot – recent surveys by Eurobarometer show that European women between the ages of 25 and 39 want to have more children, if only it were easier to find a better work-life balance. Note to European leaders: stop worrying about the effects of immigration and start creating better-paid part-time work.

  Newsweek, September 28, 2009

  A sudden surge of births within the next few years could bring forth

  Escolha uma alternativa para a questão 0814ee90-b6

  A

  a significant increase of the workforce in approximately two decades

  B

  a decrease in health-care investments

  C

  a sudden crumbling of the infrastructure

  D

  a shrinking of the budget

  Responder
• 08105662-B6

  Inglês

  Interpretação de texto | Reading comprehensionUECE · 2009DifícilEntre para guardar nos favoritos

  TEXT

      One reason growth forecasts for rich nations are so grim is the common assumption that birth rates are falling. Fewer people will produce less income, and shrinking economies. Only the assumption of aging populations may be wrong, according to a recent report by Goldman Sachs that looks at key demographic trends for the 21st century.

      Since bottoming out in 2001, fertility rates in a number of developed economies have actually been on the rise. Among rich economies, the jump is most pronounced in places like the United Kingdom, France, Spain, and the U.S. Larger immigrant populations in these nations have something to do with this, as they tend to have more children. Yet the effect is only short term, as migrants adopt the fertility rates of their new homes within a generation or so.

      Goldman’s new analysis shows that another reason for the unexpected jump, and one that will play a bigger role in the future, is that women in rich countries have been having children later and later in life, something that traditional economic models don’t account for. Standard estimates of fertility are still tabulated assuming that most women are having children in their early 20s, rather than late 20s or even 30s and 40s, as has become more common in rich countries with lots of women in the workforce. “In parts of Europe (this method of calculation) has probably understated true fertility by about 15 to 20 percent,” notes Goldman Sachs economist Peter Berezin.

      Those are big numbers, with potentially very significant ramifications. For starters, it could be that some of the problems faced by aging nations with shrinking tax bases (like, for example, overblown health-care spending, crumbling infrastructure, and budget shortfalls) may not be quite as bad as once envisioned. In fact, there is some evidence to suggest that we may soon start seeing mini baby booms, which, in 20 years or so, could have a significant impact on the size of rich nations’ workforces, a shift that can’t come too soon for countries now struggling with unprecedented levels of national debt. Another bright spot – recent surveys by Eurobarometer show that European women between the ages of 25 and 39 want to have more children, if only it were easier to find a better work-life balance. Note to European leaders: stop worrying about the effects of immigration and start creating better-paid part-time work.

  Newsweek, September 28, 2009

  Among the problems in aging nations, the text mentions

  Escolha uma alternativa para a questão 08105662-b6

  A

  an increase in illiteracy rates among women

  B

  sudden shrinking of both budget and spending

  C

  spending on health-care for illegal immigrants

  D

  imbalance between the budget and the huge amount of money spent on health-care

  Responder
• 080CA562-B6

  Inglês

  Interpretação de texto | Reading comprehensionUECE · 2009DifícilEntre para guardar nos favoritos

  TEXT

      One reason growth forecasts for rich nations are so grim is the common assumption that birth rates are falling. Fewer people will produce less income, and shrinking economies. Only the assumption of aging populations may be wrong, according to a recent report by Goldman Sachs that looks at key demographic trends for the 21st century.

      Since bottoming out in 2001, fertility rates in a number of developed economies have actually been on the rise. Among rich economies, the jump is most pronounced in places like the United Kingdom, France, Spain, and the U.S. Larger immigrant populations in these nations have something to do with this, as they tend to have more children. Yet the effect is only short term, as migrants adopt the fertility rates of their new homes within a generation or so.

      Goldman’s new analysis shows that another reason for the unexpected jump, and one that will play a bigger role in the future, is that women in rich countries have been having children later and later in life, something that traditional economic models don’t account for. Standard estimates of fertility are still tabulated assuming that most women are having children in their early 20s, rather than late 20s or even 30s and 40s, as has become more common in rich countries with lots of women in the workforce. “In parts of Europe (this method of calculation) has probably understated true fertility by about 15 to 20 percent,” notes Goldman Sachs economist Peter Berezin.

      Those are big numbers, with potentially very significant ramifications. For starters, it could be that some of the problems faced by aging nations with shrinking tax bases (like, for example, overblown health-care spending, crumbling infrastructure, and budget shortfalls) may not be quite as bad as once envisioned. In fact, there is some evidence to suggest that we may soon start seeing mini baby booms, which, in 20 years or so, could have a significant impact on the size of rich nations’ workforces, a shift that can’t come too soon for countries now struggling with unprecedented levels of national debt. Another bright spot – recent surveys by Eurobarometer show that European women between the ages of 25 and 39 want to have more children, if only it were easier to find a better work-life balance. Note to European leaders: stop worrying about the effects of immigration and start creating better-paid part-time work.

  Newsweek, September 28, 2009

  In European countries women in the age group ranging from late 20’s to late 30’s, are

  Escolha uma alternativa para a questão 080ca562-b6

  A

  willing to have more babies if they can reach a work-life equilibrium

  B

  too busy to think about having children

  C

  leaving their jobs to become full time mothers

  D

  the main workforce of these nations

  Responder
• 0808C37E-B6

  Inglês

  Interpretação de texto | Reading comprehensionUECE · 2009DifícilEntre para guardar nos favoritos

  TEXT

      One reason growth forecasts for rich nations are so grim is the common assumption that birth rates are falling. Fewer people will produce less income, and shrinking economies. Only the assumption of aging populations may be wrong, according to a recent report by Goldman Sachs that looks at key demographic trends for the 21st century.

      Since bottoming out in 2001, fertility rates in a number of developed economies have actually been on the rise. Among rich economies, the jump is most pronounced in places like the United Kingdom, France, Spain, and the U.S. Larger immigrant populations in these nations have something to do with this, as they tend to have more children. Yet the effect is only short term, as migrants adopt the fertility rates of their new homes within a generation or so.

      Goldman’s new analysis shows that another reason for the unexpected jump, and one that will play a bigger role in the future, is that women in rich countries have been having children later and later in life, something that traditional economic models don’t account for. Standard estimates of fertility are still tabulated assuming that most women are having children in their early 20s, rather than late 20s or even 30s and 40s, as has become more common in rich countries with lots of women in the workforce. “In parts of Europe (this method of calculation) has probably understated true fertility by about 15 to 20 percent,” notes Goldman Sachs economist Peter Berezin.

      Those are big numbers, with potentially very significant ramifications. For starters, it could be that some of the problems faced by aging nations with shrinking tax bases (like, for example, overblown health-care spending, crumbling infrastructure, and budget shortfalls) may not be quite as bad as once envisioned. In fact, there is some evidence to suggest that we may soon start seeing mini baby booms, which, in 20 years or so, could have a significant impact on the size of rich nations’ workforces, a shift that can’t come too soon for countries now struggling with unprecedented levels of national debt. Another bright spot – recent surveys by Eurobarometer show that European women between the ages of 25 and 39 want to have more children, if only it were easier to find a better work-life balance. Note to European leaders: stop worrying about the effects of immigration and start creating better-paid part-time work.

  Newsweek, September 28, 2009

  One of the factors that have led to the surprising increase in birth rates in wealthy nations is the fact that

  Escolha uma alternativa para a questão 0808c37e-b6

  A

  the immigrant population has been reduced

  B

  women are choosing to become mothers at a later age

  C

  young women are having more and more children

  D

  hundreds of women are leaving the workplace

  Responder
• 0802FEAD-B6

  Inglês

  Interpretação de texto | Reading comprehensionUECE · 2009DifícilEntre para guardar nos favoritos

  TEXT

      One reason growth forecasts for rich nations are so grim is the common assumption that birth rates are falling. Fewer people will produce less income, and shrinking economies. Only the assumption of aging populations may be wrong, according to a recent report by Goldman Sachs that looks at key demographic trends for the 21st century.

      Since bottoming out in 2001, fertility rates in a number of developed economies have actually been on the rise. Among rich economies, the jump is most pronounced in places like the United Kingdom, France, Spain, and the U.S. Larger immigrant populations in these nations have something to do with this, as they tend to have more children. Yet the effect is only short term, as migrants adopt the fertility rates of their new homes within a generation or so.

      Goldman’s new analysis shows that another reason for the unexpected jump, and one that will play a bigger role in the future, is that women in rich countries have been having children later and later in life, something that traditional economic models don’t account for. Standard estimates of fertility are still tabulated assuming that most women are having children in their early 20s, rather than late 20s or even 30s and 40s, as has become more common in rich countries with lots of women in the workforce. “In parts of Europe (this method of calculation) has probably understated true fertility by about 15 to 20 percent,” notes Goldman Sachs economist Peter Berezin.

      Those are big numbers, with potentially very significant ramifications. For starters, it could be that some of the problems faced by aging nations with shrinking tax bases (like, for example, overblown health-care spending, crumbling infrastructure, and budget shortfalls) may not be quite as bad as once envisioned. In fact, there is some evidence to suggest that we may soon start seeing mini baby booms, which, in 20 years or so, could have a significant impact on the size of rich nations’ workforces, a shift that can’t come too soon for countries now struggling with unprecedented levels of national debt. Another bright spot – recent surveys by Eurobarometer show that European women between the ages of 25 and 39 want to have more children, if only it were easier to find a better work-life balance. Note to European leaders: stop worrying about the effects of immigration and start creating better-paid part-time work.

  Newsweek, September 28, 2009

  The text refers to a report about demographic trends which shows that

  Escolha uma alternativa para a questão 0802fead-b6

  A

  fertility rates have fallen dramatically since the beginning of the 21st century

  B

  while birth rates have risen in the U.S., they have fallen in the U.K

  C

  birth rates have risen in wealthy countries since reaching the lowest point in the beginning of the 21st century

  D

  countries like the U.K., the U.S., France, and Spain are among those with the lowest birth rates in recent years workplace

  Responder
• 07FEA516-B6

  Biologia

  Embriologia humanaUECE · 2009MédioEntre para guardar nos favoritos

  Considerando a origem embrionária dos tipos de tecidos epiteliais que constituem a epiderme e o forramento das cavidades internas do tubo digestivo podemos afirmar que eles se originam, respectivamente, na:

  Escolha uma alternativa para a questão 07fea516-b6

  A

  endoderme e mesoderme

  B

  ectoderme e endoderme

  C

  ectoderme e mesoderme

  D

  endoderme e ectoderme

  Responder
• 07FA08F4-B6

  Biologia

  Hereditariedade e diversidade da vidaUECE · 2009MédioEntre para guardar nos favoritos

  O número de classes fenotípicas que são produzidas numa herança poligênica que formam 256 genótipos numa F2 é de:

  Escolha uma alternativa para a questão 07fa08f4-b6

  A

  6

  B

  7

  C

  8

  D

  9

  Responder
• 07F5FE53-B6

  Biologia

  Moléculas, células e tecidosUECE · 2009MédioEntre para guardar nos favoritos

  Relacione as informações contidas na coluna 1 - organelas celulares, com seus respectivos processos fisiológicos, listados na coluna 2.

  Coluna 1. Organelas

  1 – ribossomo

  2 – mitocôndria

  3 – lisossomo

  4 – Complexo golgiense

  5 – Retículo endoplasmático agranular

  Coluna 2. Processos fisiológicos

  I – respiração celular

  II – eliminação de substâncias, processo denominado secreção celular

  III – síntese de proteínas

  IV – autofagia

  V – destruição de diversas substâncias tóxicas, entre elas o álcool

  
  

  A sequência que correlaciona corretamente as duas colunas, de cima para baixo, é a seguinte:

  Escolha uma alternativa para a questão 07f5fe53-b6

  A

  1- III, 2-I, 3-IV, 4-II, 5-V

  B

  1-I, 2-II, 3-V, 4-III, 5-IV

  C

  1-III, 2-I, 3-V, 4-IV, 5-II

  D

  1-I, 5-IV, 3-V, 4-II, 2-III

  Responder
• 07F1F01C-B6

  Biologia

  Identidade dos seres vivosUECE · 2009FácilEntre para guardar nos favoritos

  Os condutos que levam a urina dos rins para a bexiga urinária são denominados

  Escolha uma alternativa para a questão 07f1f01c-b6

  A

  canais aferentes

  B

  canais deferentes

  C

  uretra

  D

  ureteres

  Responder
• 07ECD33D-B6

  Biologia

  Esponjas e CnidáriosUECE · 2009MédioEntre para guardar nos favoritos

  As esponjas, pertencentes ao filo Porífera, são animais bastante simples e tiveram sua origem há aproximadamente um bilhão de anos. Apresentam relativa simplicidade estrutural e, por conta disso, podem ser consideradas organismos pluricelulares bastante primitivos. Quanto às esponjas, é correto afirmar que:

  Escolha uma alternativa para a questão 07ecd33d-b6

  A

  não possuem tecidos verdadeiros e apresentam apenas espículas silicosas.

  B

  possuem tecidos verdadeiros e podem apresentar espículas CaCO3 ou silicosas

  C

  não possuem tecidos verdadeiros e podem apresentar espículas calcáreas ou silicosas

  D

  possuem tecidos verdadeiros e por isso mesmo apresentam seu esqueleto composto por espongina

  Responder
• 07E836A2-B6

  Biologia

  Briófitas e PteridófitasUECE · 2009DifícilEntre para guardar nos favoritos

  As pteridófitas são os primeiros vegetais vascularizados. Podemos dizer que são as primeiras plantas com raiz, caule e folha verdadeiros. A maioria das espécies é terrestre e habita lugares úmidos e sombrios. Também chamadas popularmente de samambaias, essas plantas podem se reproduzir tanto assexuadamente como sexuadamente. Considerando o ciclo reprodutivo das samambaias é correto afirmar que

  Escolha uma alternativa para a questão 07e836a2-b6

  A

  a fase dominante do ciclo de vida das samambaias é representada pelo gametófito

  B

  a fase efêmera do ciclo de vida das samambaias é representada pelo esporófito

  C

  as samambaias se reproduzem assexuadamente pela produção de um protalo, onde se formam os esporos

  D

  as samambaias cultivadas em cestas são esporófitos e, portanto, representam a fase dominante do ciclo evolutivo.

  Responder
• 07E4F616-B6

  Química

  Energias Químicas no CotidianoUECE · 2009DifícilEntre para guardar nos favoritos

  

  A camada pré-sal se estende por cerca de 800 quilômetros ao longo da costa brasileira e o petróleo encontrado nesta área está a profundidades que superam os 7 mil metros, abaixo de uma extensa camada de sal que, segundo os geólogos, conservam a qualidade do petróleo, sendo considerado uma das maiores descobertas do mundo dos últimos sete anos. Assinale a alternativa que não é um derivado do petróleo.

  Escolha uma alternativa para a questão 07e4f616-b6

  A

  Querosene.

  B

  Polietileno.

  C

  Óleo lubrificante.

  D

  Nafta.

  Responder
• 07DF90CA-B6

  Química

  Soluções e Substâncias InorgânicasUECE · 2009MédioEntre para guardar nos favoritos

  

  O magnésio metálico puro, em aparas, quando aquecido na chama do bico de Bunsen produz uma única substância, um pó branco que reage com a água produzindo um material que, em presença de fenolftaleína, adquire a coloração vermelha. Com estas informações e com os conhecimentos de química que você detém, marque a única alternativa verdadeira.

  Escolha uma alternativa para a questão 07df90ca-b6

  A

  A primeira reação mencionada no texto é uma reação de síntese e a segunda reação é de deslocamento.

  B

  Na primeira reação o magnésio metálico sofre uma redução.

  C

  O percentual de magnésio na fórmula do composto formado na primeira reação é, aproximadamente, 60,3%.

  D

  A mudança de cor do material formado indica que houve uma reação química cujo produto é um sal básico.

  Responder
• 07DC1DD3-B6

  Química

  Energias Químicas no CotidianoUECE · 2009DifícilEntre para guardar nos favoritos

  

  Construções de ciclovias nas grandes cidades representam uma possibilidade saudável de combate ao trânsito e ao excessivo uso de veículos (automóveis, motos e ônibus) e poupam queima de combustível e, conseqüentemente, diminuem a poluição do ar. As ciclovias proporcionaram mudança de hábito com o surgimento de novos ciclistas, alguns abandonando seus veículos, preservando desta forma o meio ambiente do nocivo monóxido de carbono (CO), principal poluente dos combustíveis fósseis. Com respeito a esse composto assinale a alternativa correta.

  Escolha uma alternativa para a questão 07dc1dd3-b6

  A

  é formado por elementos dos grupos 13 (3A) e 16 (6A) da Tabela Periódica Moderna.

  B

  os elementos C e O possuem subnível 2p cada um com um elétron de número quântico mL = 0.

  C

  o átomo de carbono tem maior energia de ionização que o átomo de oxigênio.

  D

  o elemento C pertence a família dos Calcogênios

  Responder
• 07D863BB-B6

  Química

  Radioatividade: Reações de Fissão e Fusão Nuclear, Desintegração Radioativa e Radioisótopos.UECE · 2009MédioEntre para guardar nos favoritos

  

  O programa Fantástico (04.10.2009) da Rede Globo noticiou com grande estardalhaço: “Matéria para fabricar bomba atômica é vendida no Amapá”. A notícia se referia à Torianita, um mineral composto por óxido de tório, contendo hélio e os óxidos de urânio, lantânio, cério , praseodímio e neodímio. Da leitura das informações acima e também a partir de seus conhecimentos, assinale a única alternativa verdadeira:

  Escolha uma alternativa para a questão 07d863bb-b6

  A

  a bomba de urânio produz uma grande quantidade de energia através de uma fusão nuclear apresentando múltiplas reações em cadeia.

  B

  lantânio e cério são metais de transição simples localizados no bloco d da tabela periódica.

  C

  o hélio e o tório são gases altamente reativos e de grande poder de contaminação.

  D

  Os elétrons diferenciais do praseodímio e do neodímio estão localizados na antepenúltima camada dos respectivos átomos.

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• 07D53C8C-B6

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  Isomeria: Isomeria Espacial: Isomeria Geométrica (cis-trans) e Isomeria Óptica.UECE · 2009DifícilEntre para guardar nos favoritos

  

  As duas proposições abaixo estão relacionadas com a preparação e separação de compostos opticamente ativos:

  ( ) os organismos vegetais e animais produzem seus compostos opticamente ativos já na forma (dextrógira ou levógira) adequada a seu metabolismo. No laboratório, porém, as reações comuns produzem misturas racêmicas.

  ( ) a separação de uma mistura racêmica não é fácil em virtude de dois enantiomorfos terem propriedades físicas iguais.

  
  

  Marcando com V a afirmativa verdadeira e com F a falsa, assinale a seqüência correta de cima para baixo.
  

  Escolha uma alternativa para a questão 07d53c8c-b6

  A

  V, V

  B

  F, V

  C

  F, F

  D

  V, F

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