Matemática
Circunferências e CírculosFGV · 2013MédioEntre para guardar nos favoritosNo plano cartesiano, uma circunferência tem centro C(5,3) e tangencia a reta de equação 3x + 4y - 12 = 0 .
A equação dessa circunferência é:
Questões do ENEM 2013
Questões aplicadas na prova de 2013, cada uma em página própria com enunciado, alternativas e gabarito.
Resultados
2.450 questões encontradas. Mostrando a página 28 de 123.
4BEE23FB-D7 4BE204E9-D7 Matemática
Aritmética e ProblemasFGV · 2013MédioEntre para guardar nos favoritosToda segunda-feira, Valéria coloca R$ 100,00 de gasolina no tanque de seu carro. Em uma determinada segunda-feira, o preço por litro do combustível sofreu um acréscimo de 5% em relação ao preço da segunda-feira anterior. Nessas condições, na última segunda-feira, o volume de gasolina colocado foi x% inferior ao da segunda-feira anterior. É correto afirmar que x pertence ao intervalo86F2441D-C6 Inglês
Interpretação de texto | Reading comprehensionUECE · 2013DifícilEntre para guardar nos favoritosTEXT
In his speech in Varginha, Pope Francis mentioned that one of his aims in the Papacy isRIO DE JANEIRO — Pope Francis on Thursday delivered some of his most politically provocative remarks since his papacy began this year, hopping from his popemobile to walk through a slum in this city before urging young people to fight against corruption, a leading grievance behind the huge street protests that shook dozens of Brazilian cities in June.“Do not grow accustomed to evil, but defeat it,” Francis said at the favela, or slum, of Varginha, in an area that has commonly been known here as the Gaza Strip for its gun battles and drug trafficking in the past. “Do not lose trust, do not allow your hope to be extinguished,” he added, acknowledging that it was common for some to “grow disillusioned with news of corruption.”By singling out corruption in a folksy visit to a Brazilian favela on his first trip abroad as pope, Francis, an Argentine-born Jesuit, emphasized his aim to refocus the Roman Catholic Church on the neglected margins of society, especially in Brazil and other parts of Latin America where the popularity of evangelical churches has surged among the poor in recent decades.In a nod to the Brazilian political authorities who have warmly welcomed him, Francis also praised the government’s antipoverty programs and did not specifically mention the anti-establishment protests in Brazil. But he did critique Rio de Janeiro’s so-called pacification project in the city’s slums, in which security forces assert control over lawless areas.“No amount of pacification will be able to last, nor will harmony and happiness be attained in a society that ignores, pushes to the margins or excludes a part of itself,” the pope said in Varginha, a slum that has recently been subjected to pacification. In a remark that could resonate in Latin America and in the United States, which is also grappling with the widening disparity between the haves and the have-nots, Francis said that a society “impoverishes itself” by perpetuating such inequality.Care for the poor and marginalized is an integral part of Catholic teaching, and a concern of many popes and encyclicals, including those by Francis’ predecessor, Benedict XVI. But Francis has made it a hallmark of his young papacy, telling journalists in Rome days after his election, “How I would like a church that is poor and for the poor.” He has demonstrated that ideal by living relatively humbly as pope: in a communal guesthouse rather than the opulent papal apartment, wearing a pectoral cross of iron instead of gold, flying commercial. He recently told priests that they should not drive fancy cars, and he has traveled around Rio this week in a compact Fiat.“He is helping to wake people up,” said Natalia Morais, 21, a nursing student from Minas Gerais State who traveled to Rio to see the pope as part of World Youth Day, a conference attended by hundreds of thousands of Catholic youth. “When the pope talks, political leaders listen, and that’s what’s needed in Brazil, where our protests are about their corruption,” Ms. Morais said.Reaching beyond Brazil, Francis told Argentines who came here for the conference that “the church must be taken into the streets” in a struggle against complacency. “Stir things up, cause confounding, but do not diminish faith in Jesus Christ,” he said in Spanish.In each of Francis’ public appearances, he has been accorded a rock-star reception. On an uncommonly cold and rainy morning, hundreds of residents lined the narrow, muddy sidewalks of the Varginha favela to glimpse the first pope from the Americas, who obliged by stopping often to touch and bless people.Many onlookers had made their own shirts to commemorate the event, with a photo of Francis. Others draped themselves in Brazilian flags and waved banners bearing his image. Residents darted in and out of their homes, checking their televisions and radios to learn the pope’s whereabouts and calling the information out to their neighbors standing on wet rooftops to get a better view.Sônia Curato, 48, a manicurist, said the pope’s visit was different from that of other leaders. “Politicians come all the time. They make promises and leave,” she said. “He is a very simple person. You can tell that. He has charisma. He speaks to the people, doesn’t like going around in an armored car.”By Simon Romero and Taylor BarnesPublished: July 25, 2013www.nytimes.com86ED567B-C6 Inglês
Interpretação de texto | Reading comprehensionUECE · 2013MédioEntre para guardar nos favoritosTEXT
RIO DE JANEIRO — Pope Francis on Thursday delivered some of his most politically provocative remarks since his papacy began this year, hopping from his popemobile to walk through a slum in this city before urging young people to fight against corruption, a leading grievance behind the huge street protests that shook dozens of Brazilian cities in June.“Do not grow accustomed to evil, but defeat it,” Francis said at the favela, or slum, of Varginha, in an area that has commonly been known here as the Gaza Strip for its gun battles and drug trafficking in the past. “Do not lose trust, do not allow your hope to be extinguished,” he added, acknowledging that it was common for some to “grow disillusioned with news of corruption.”By singling out corruption in a folksy visit to a Brazilian favela on his first trip abroad as pope, Francis, an Argentine-born Jesuit, emphasized his aim to refocus the Roman Catholic Church on the neglected margins of society, especially in Brazil and other parts of Latin America where the popularity of evangelical churches has surged among the poor in recent decades.In a nod to the Brazilian political authorities who have warmly welcomed him, Francis also praised the government’s antipoverty programs and did not specifically mention the anti-establishment protests in Brazil. But he did critique Rio de Janeiro’s so-called pacification project in the city’s slums, in which security forces assert control over lawless areas.“No amount of pacification will be able to last, nor will harmony and happiness be attained in a society that ignores, pushes to the margins or excludes a part of itself,” the pope said in Varginha, a slum that has recently been subjected to pacification. In a remark that could resonate in Latin America and in the United States, which is also grappling with the widening disparity between the haves and the have-nots, Francis said that a society “impoverishes itself” by perpetuating such inequality.Care for the poor and marginalized is an integral part of Catholic teaching, and a concern of many popes and encyclicals, including those by Francis’ predecessor, Benedict XVI. But Francis has made it a hallmark of his young papacy, telling journalists in Rome days after his election, “How I would like a church that is poor and for the poor.” He has demonstrated that ideal by living relatively humbly as pope: in a communal guesthouse rather than the opulent papal apartment, wearing a pectoral cross of iron instead of gold, flying commercial. He recently told priests that they should not drive fancy cars, and he has traveled around Rio this week in a compact Fiat.“He is helping to wake people up,” said Natalia Morais, 21, a nursing student from Minas Gerais State who traveled to Rio to see the pope as part of World Youth Day, a conference attended by hundreds of thousands of Catholic youth. “When the pope talks, political leaders listen, and that’s what’s needed in Brazil, where our protests are about their corruption,” Ms. Morais said.Reaching beyond Brazil, Francis told Argentines who came here for the conference that “the church must be taken into the streets” in a struggle against complacency. “Stir things up, cause confounding, but do not diminish faith in Jesus Christ,” he said in Spanish.In each of Francis’ public appearances, he has been accorded a rock-star reception. On an uncommonly cold and rainy morning, hundreds of residents lined the narrow, muddy sidewalks of the Varginha favela to glimpse the first pope from the Americas, who obliged by stopping often to touch and bless people.Many onlookers had made their own shirts to commemorate the event, with a photo of Francis. Others draped themselves in Brazilian flags and waved banners bearing his image. Residents darted in and out of their homes, checking their televisions and radios to learn the pope’s whereabouts and calling the information out to their neighbors standing on wet rooftops to get a better view.Sônia Curato, 48, a manicurist, said the pope’s visit was different from that of other leaders. “Politicians come all the time. They make promises and leave,” she said. “He is a very simple person. You can tell that. He has charisma. He speaks to the people, doesn’t like going around in an armored car.”By Simon Romero and Taylor BarnesPublished: July 25, 2013www.nytimes.comPope Francis’ optimism could be seen in Varginha, where he told people to
86E92ECF-C6 Inglês
Interpretação de texto | Reading comprehensionUECE · 2013DifícilEntre para guardar nos favoritosTEXT
Some of the things the Pope has done that show he is trying to keep humble areRIO DE JANEIRO — Pope Francis on Thursday delivered some of his most politically provocative remarks since his papacy began this year, hopping from his popemobile to walk through a slum in this city before urging young people to fight against corruption, a leading grievance behind the huge street protests that shook dozens of Brazilian cities in June.“Do not grow accustomed to evil, but defeat it,” Francis said at the favela, or slum, of Varginha, in an area that has commonly been known here as the Gaza Strip for its gun battles and drug trafficking in the past. “Do not lose trust, do not allow your hope to be extinguished,” he added, acknowledging that it was common for some to “grow disillusioned with news of corruption.”By singling out corruption in a folksy visit to a Brazilian favela on his first trip abroad as pope, Francis, an Argentine-born Jesuit, emphasized his aim to refocus the Roman Catholic Church on the neglected margins of society, especially in Brazil and other parts of Latin America where the popularity of evangelical churches has surged among the poor in recent decades.In a nod to the Brazilian political authorities who have warmly welcomed him, Francis also praised the government’s antipoverty programs and did not specifically mention the anti-establishment protests in Brazil. But he did critique Rio de Janeiro’s so-called pacification project in the city’s slums, in which security forces assert control over lawless areas.“No amount of pacification will be able to last, nor will harmony and happiness be attained in a society that ignores, pushes to the margins or excludes a part of itself,” the pope said in Varginha, a slum that has recently been subjected to pacification. In a remark that could resonate in Latin America and in the United States, which is also grappling with the widening disparity between the haves and the have-nots, Francis said that a society “impoverishes itself” by perpetuating such inequality.Care for the poor and marginalized is an integral part of Catholic teaching, and a concern of many popes and encyclicals, including those by Francis’ predecessor, Benedict XVI. But Francis has made it a hallmark of his young papacy, telling journalists in Rome days after his election, “How I would like a church that is poor and for the poor.” He has demonstrated that ideal by living relatively humbly as pope: in a communal guesthouse rather than the opulent papal apartment, wearing a pectoral cross of iron instead of gold, flying commercial. He recently told priests that they should not drive fancy cars, and he has traveled around Rio this week in a compact Fiat.“He is helping to wake people up,” said Natalia Morais, 21, a nursing student from Minas Gerais State who traveled to Rio to see the pope as part of World Youth Day, a conference attended by hundreds of thousands of Catholic youth. “When the pope talks, political leaders listen, and that’s what’s needed in Brazil, where our protests are about their corruption,” Ms. Morais said.Reaching beyond Brazil, Francis told Argentines who came here for the conference that “the church must be taken into the streets” in a struggle against complacency. “Stir things up, cause confounding, but do not diminish faith in Jesus Christ,” he said in Spanish.In each of Francis’ public appearances, he has been accorded a rock-star reception. On an uncommonly cold and rainy morning, hundreds of residents lined the narrow, muddy sidewalks of the Varginha favela to glimpse the first pope from the Americas, who obliged by stopping often to touch and bless people.Many onlookers had made their own shirts to commemorate the event, with a photo of Francis. Others draped themselves in Brazilian flags and waved banners bearing his image. Residents darted in and out of their homes, checking their televisions and radios to learn the pope’s whereabouts and calling the information out to their neighbors standing on wet rooftops to get a better view.Sônia Curato, 48, a manicurist, said the pope’s visit was different from that of other leaders. “Politicians come all the time. They make promises and leave,” she said. “He is a very simple person. You can tell that. He has charisma. He speaks to the people, doesn’t like going around in an armored car.”By Simon Romero and Taylor BarnesPublished: July 25, 2013www.nytimes.com86E43421-C6 Inglês
Interpretação de texto | Reading comprehensionUECE · 2013DifícilEntre para guardar nos favoritosTEXT
RIO DE JANEIRO — Pope Francis on Thursday delivered some of his most politically provocative remarks since his papacy began this year, hopping from his popemobile to walk through a slum in this city before urging young people to fight against corruption, a leading grievance behind the huge street protests that shook dozens of Brazilian cities in June.“Do not grow accustomed to evil, but defeat it,” Francis said at the favela, or slum, of Varginha, in an area that has commonly been known here as the Gaza Strip for its gun battles and drug trafficking in the past. “Do not lose trust, do not allow your hope to be extinguished,” he added, acknowledging that it was common for some to “grow disillusioned with news of corruption.”By singling out corruption in a folksy visit to a Brazilian favela on his first trip abroad as pope, Francis, an Argentine-born Jesuit, emphasized his aim to refocus the Roman Catholic Church on the neglected margins of society, especially in Brazil and other parts of Latin America where the popularity of evangelical churches has surged among the poor in recent decades.In a nod to the Brazilian political authorities who have warmly welcomed him, Francis also praised the government’s antipoverty programs and did not specifically mention the anti-establishment protests in Brazil. But he did critique Rio de Janeiro’s so-called pacification project in the city’s slums, in which security forces assert control over lawless areas.“No amount of pacification will be able to last, nor will harmony and happiness be attained in a society that ignores, pushes to the margins or excludes a part of itself,” the pope said in Varginha, a slum that has recently been subjected to pacification. In a remark that could resonate in Latin America and in the United States, which is also grappling with the widening disparity between the haves and the have-nots, Francis said that a society “impoverishes itself” by perpetuating such inequality.Care for the poor and marginalized is an integral part of Catholic teaching, and a concern of many popes and encyclicals, including those by Francis’ predecessor, Benedict XVI. But Francis has made it a hallmark of his young papacy, telling journalists in Rome days after his election, “How I would like a church that is poor and for the poor.” He has demonstrated that ideal by living relatively humbly as pope: in a communal guesthouse rather than the opulent papal apartment, wearing a pectoral cross of iron instead of gold, flying commercial. He recently told priests that they should not drive fancy cars, and he has traveled around Rio this week in a compact Fiat.“He is helping to wake people up,” said Natalia Morais, 21, a nursing student from Minas Gerais State who traveled to Rio to see the pope as part of World Youth Day, a conference attended by hundreds of thousands of Catholic youth. “When the pope talks, political leaders listen, and that’s what’s needed in Brazil, where our protests are about their corruption,” Ms. Morais said.Reaching beyond Brazil, Francis told Argentines who came here for the conference that “the church must be taken into the streets” in a struggle against complacency. “Stir things up, cause confounding, but do not diminish faith in Jesus Christ,” he said in Spanish.In each of Francis’ public appearances, he has been accorded a rock-star reception. On an uncommonly cold and rainy morning, hundreds of residents lined the narrow, muddy sidewalks of the Varginha favela to glimpse the first pope from the Americas, who obliged by stopping often to touch and bless people.Many onlookers had made their own shirts to commemorate the event, with a photo of Francis. Others draped themselves in Brazilian flags and waved banners bearing his image. Residents darted in and out of their homes, checking their televisions and radios to learn the pope’s whereabouts and calling the information out to their neighbors standing on wet rooftops to get a better view.Sônia Curato, 48, a manicurist, said the pope’s visit was different from that of other leaders. “Politicians come all the time. They make promises and leave,” she said. “He is a very simple person. You can tell that. He has charisma. He speaks to the people, doesn’t like going around in an armored car.”By Simon Romero and Taylor BarnesPublished: July 25, 2013www.nytimes.comWhen he met with Argentines, the Pope mentioned that besides stirring things up, they should
86DD95CA-C6 Inglês
Interpretação de texto | Reading comprehensionUECE · 2013Muito difícilEntre para guardar nos favoritosTEXT
RIO DE JANEIRO — Pope Francis on Thursday delivered some of his most politically provocative remarks since his papacy began this year, hopping from his popemobile to walk through a slum in this city before urging young people to fight against corruption, a leading grievance behind the huge street protests that shook dozens of Brazilian cities in June.“Do not grow accustomed to evil, but defeat it,” Francis said at the favela, or slum, of Varginha, in an area that has commonly been known here as the Gaza Strip for its gun battles and drug trafficking in the past. “Do not lose trust, do not allow your hope to be extinguished,” he added, acknowledging that it was common for some to “grow disillusioned with news of corruption.”By singling out corruption in a folksy visit to a Brazilian favela on his first trip abroad as pope, Francis, an Argentine-born Jesuit, emphasized his aim to refocus the Roman Catholic Church on the neglected margins of society, especially in Brazil and other parts of Latin America where the popularity of evangelical churches has surged among the poor in recent decades.In a nod to the Brazilian political authorities who have warmly welcomed him, Francis also praised the government’s antipoverty programs and did not specifically mention the anti-establishment protests in Brazil. But he did critique Rio de Janeiro’s so-called pacification project in the city’s slums, in which security forces assert control over lawless areas.“No amount of pacification will be able to last, nor will harmony and happiness be attained in a society that ignores, pushes to the margins or excludes a part of itself,” the pope said in Varginha, a slum that has recently been subjected to pacification. In a remark that could resonate in Latin America and in the United States, which is also grappling with the widening disparity between the haves and the have-nots, Francis said that a society “impoverishes itself” by perpetuating such inequality.Care for the poor and marginalized is an integral part of Catholic teaching, and a concern of many popes and encyclicals, including those by Francis’ predecessor, Benedict XVI. But Francis has made it a hallmark of his young papacy, telling journalists in Rome days after his election, “How I would like a church that is poor and for the poor.” He has demonstrated that ideal by living relatively humbly as pope: in a communal guesthouse rather than the opulent papal apartment, wearing a pectoral cross of iron instead of gold, flying commercial. He recently told priests that they should not drive fancy cars, and he has traveled around Rio this week in a compact Fiat.“He is helping to wake people up,” said Natalia Morais, 21, a nursing student from Minas Gerais State who traveled to Rio to see the pope as part of World Youth Day, a conference attended by hundreds of thousands of Catholic youth. “When the pope talks, political leaders listen, and that’s what’s needed in Brazil, where our protests are about their corruption,” Ms. Morais said.Reaching beyond Brazil, Francis told Argentines who came here for the conference that “the church must be taken into the streets” in a struggle against complacency. “Stir things up, cause confounding, but do not diminish faith in Jesus Christ,” he said in Spanish.In each of Francis’ public appearances, he has been accorded a rock-star reception. On an uncommonly cold and rainy morning, hundreds of residents lined the narrow, muddy sidewalks of the Varginha favela to glimpse the first pope from the Americas, who obliged by stopping often to touch and bless people.Many onlookers had made their own shirts to commemorate the event, with a photo of Francis. Others draped themselves in Brazilian flags and waved banners bearing his image. Residents darted in and out of their homes, checking their televisions and radios to learn the pope’s whereabouts and calling the information out to their neighbors standing on wet rooftops to get a better view.Sônia Curato, 48, a manicurist, said the pope’s visit was different from that of other leaders. “Politicians come all the time. They make promises and leave,” she said. “He is a very simple person. You can tell that. He has charisma. He speaks to the people, doesn’t like going around in an armored car.”By Simon Romero and Taylor BarnesPublished: July 25, 2013www.nytimes.comPope Francis criticized the pacification project because he believes
86D93283-C6 Inglês
Interpretação de texto | Reading comprehensionUECE · 2013DifícilEntre para guardar nos favoritosTEXT
RIO DE JANEIRO — Pope Francis on Thursday delivered some of his most politically provocative remarks since his papacy began this year, hopping from his popemobile to walk through a slum in this city before urging young people to fight against corruption, a leading grievance behind the huge street protests that shook dozens of Brazilian cities in June.“Do not grow accustomed to evil, but defeat it,” Francis said at the favela, or slum, of Varginha, in an area that has commonly been known here as the Gaza Strip for its gun battles and drug trafficking in the past. “Do not lose trust, do not allow your hope to be extinguished,” he added, acknowledging that it was common for some to “grow disillusioned with news of corruption.”By singling out corruption in a folksy visit to a Brazilian favela on his first trip abroad as pope, Francis, an Argentine-born Jesuit, emphasized his aim to refocus the Roman Catholic Church on the neglected margins of society, especially in Brazil and other parts of Latin America where the popularity of evangelical churches has surged among the poor in recent decades.In a nod to the Brazilian political authorities who have warmly welcomed him, Francis also praised the government’s antipoverty programs and did not specifically mention the anti-establishment protests in Brazil. But he did critique Rio de Janeiro’s so-called pacification project in the city’s slums, in which security forces assert control over lawless areas.“No amount of pacification will be able to last, nor will harmony and happiness be attained in a society that ignores, pushes to the margins or excludes a part of itself,” the pope said in Varginha, a slum that has recently been subjected to pacification. In a remark that could resonate in Latin America and in the United States, which is also grappling with the widening disparity between the haves and the have-nots, Francis said that a society “impoverishes itself” by perpetuating such inequality.Care for the poor and marginalized is an integral part of Catholic teaching, and a concern of many popes and encyclicals, including those by Francis’ predecessor, Benedict XVI. But Francis has made it a hallmark of his young papacy, telling journalists in Rome days after his election, “How I would like a church that is poor and for the poor.” He has demonstrated that ideal by living relatively humbly as pope: in a communal guesthouse rather than the opulent papal apartment, wearing a pectoral cross of iron instead of gold, flying commercial. He recently told priests that they should not drive fancy cars, and he has traveled around Rio this week in a compact Fiat.“He is helping to wake people up,” said Natalia Morais, 21, a nursing student from Minas Gerais State who traveled to Rio to see the pope as part of World Youth Day, a conference attended by hundreds of thousands of Catholic youth. “When the pope talks, political leaders listen, and that’s what’s needed in Brazil, where our protests are about their corruption,” Ms. Morais said.Reaching beyond Brazil, Francis told Argentines who came here for the conference that “the church must be taken into the streets” in a struggle against complacency. “Stir things up, cause confounding, but do not diminish faith in Jesus Christ,” he said in Spanish.In each of Francis’ public appearances, he has been accorded a rock-star reception. On an uncommonly cold and rainy morning, hundreds of residents lined the narrow, muddy sidewalks of the Varginha favela to glimpse the first pope from the Americas, who obliged by stopping often to touch and bless people.Many onlookers had made their own shirts to commemorate the event, with a photo of Francis. Others draped themselves in Brazilian flags and waved banners bearing his image. Residents darted in and out of their homes, checking their televisions and radios to learn the pope’s whereabouts and calling the information out to their neighbors standing on wet rooftops to get a better view.Sônia Curato, 48, a manicurist, said the pope’s visit was different from that of other leaders. “Politicians come all the time. They make promises and leave,” she said. “He is a very simple person. You can tell that. He has charisma. He speaks to the people, doesn’t like going around in an armored car.”By Simon Romero and Taylor BarnesPublished: July 25, 2013www.nytimes.comOne of the ways through which Pope Francis has shown he is not like his predecessors is the fact that he defends that86D46713-C6 Biologia
Biomas brasileirosUECE · 2013FácilEntre para guardar nos favoritosAs plantas da caatinga possuem algumas características particulares, como folhas transformadas em espinhos, cutículas altamente impermeáveis, caules suculentos, raízes profundas etc. Essa descrição se refere ao que definimos como
86CC265B-C6 Biologia
A química da vidaUECE · 2013MédioEntre para guardar nos favoritosNa atualidade, os suplementos vitamínicos fazem, cada vez mais, parte da rotina de pessoas em todo o mundo, pois possuem a função de suprir a deficiência de nutrientes necessários para o bom funcionamento do corpo, quando não há tempo suficiente para dedicação a uma alimentação equilibrada. Sobre as vitaminas, é correto afirmar-se que
86C7A7C7-C6 Biologia
Identidade dos seres vivosUECE · 2013MédioEntre para guardar nos favoritosA zona pilífera da raiz apresenta células epidérmicas com projeções citoplasmáticas denominadas de pelos absorventes, cuja principal função é absorver água e sais minerais indispensáveis à sobrevivência das plantas. A absorção de água pelas raízes dos vegetais acontece normalmente quando
86C2D815-C6 Biologia
MeioseUECE · 2013FácilEntre para guardar nos favoritosConsidere os eventos abaixo, que podem ocorrer na mitose ou na meiose.I. Emparelhamento dos cromossomos homólogos duplicados.II. Alinhamento dos cromossomos no plano equatorial da célula.III. Permutação de segmentos entre cromossomos homólogos.IV. Divisão dos centrômeros, resultando na separação das cromátides irmãs.No processo de multiplicação celular para reparação de tecidos, os eventos relacionados à distribuição equitativa do material genético entre as células resultantes estão contidos somente em86B70F00-C6 Química
Transformações QuímicasUECE · 2013MédioEntre para guardar nos favoritos“O raciocínio indutivo se desenvolve a partir do que já é conhecido, mas requer uma etapa adicional para descrever o que ainda é desconhecido.” (Jacob Bronowski – A escalada do homem). Foi o raciocínio indutivo que permitiu ao cientista Mendeleiev
86B40B8A-C6 Química
Soluções e Substâncias InorgânicasUECE · 2013MédioEntre para guardar nos favoritosUm material sólido, de cor acinzentada, quando posto em contato com a chama do bico de Bunsen, deu origem a um pó branco que, misturado à água com algumas gotas de uma substância halocrômica (indicador), revelou uma coloração vermelha. Quando este produto reagiu em condições estequiométricas adequadas com um ácido, a coloração vermelha desapareceu. Considerando essas informações, assinale a única afirmação verdadeira.86B09D5A-C6 Química
Termodinâmica: Energia Interna, Trabalho, Energia Livre de Gibbs e EntropiaUECE · 2013MédioEntre para guardar nos favoritosDADOS QUE PODEM SER USADOS NESTA PROVA
Segundo Bill Bryson, autor de Uma Breve História de Quase Tudo, o cientista americano Josiah Willard Gibbs (1839-1913) foi “o mais brilhante ilustre desconhecido da história”, por conta de sua modéstia e timidez. Gibbs contribuiu, em vários campos da física e da química, sobretudo na conceituação de energia livre que permitiu definir, através de cálculos singelos, a espontaneidade de uma reação química.Considerando-se o valor da constante de Faraday 96.500 C, conhecendo-se os potenciais de redução para as semirreações que ocorrem na pilha, Sn/Sn2+ // Pb2+/Pb, cujas concentrações de Sn e Pb valem, respectivamente, 1,0 M e 10-3 M, e sabendose, ainda, que:Sn2++ 2e-→ Sn Eo= - 0,14 VPb2+ + 2e-→ Pb E = - 0,22 V,pode-se afirmar corretamente que a reação global da pilha
86A58BDE-C6 Química
Cadeias Carbônicas: Características e Classificações do Átomo do Carbono, Tipos de Ligação e Hibridação. Tipos de Cadeias Carbônicas e Fórmulas. Séries: Homóloga, Isóloga e Heteróloga.UECE · 2013DifícilEntre para guardar nos favoritosDADOS QUE PODEM SER USADOS NESTA PROVA
O propano e o butano, que constituem o gás liquefeito do petróleo, são gases inodoros. Contudo, o cheiro característico do chamado “gás butano” existente em nossas cozinhas deve-se à presença de várias substâncias, dentre as quais o butilmercaptana, que é adicionado ao gás para alertar-nos quanto a possíveis vazamentos.Sobre o butilmercaptana, cuja fórmula estrutural é H3C – CH2 – CH2 – CH2 – S – H, é correto afirmar-se que
86A1E466-C6 Química
Termoquímica: Energia Calorífica, Calor de reação, Entalpia, Equações e Lei de Hess.UECE · 2013MédioEntre para guardar nos favoritosDADOS QUE PODEM SER USADOS NESTA PROVA
Normalmente uma reação química libera ou absorve calor. Esse processo é representado no seguinte diagrama, considerando uma reação específica.
Com relação a esse processo, assinale a equação química correta.
869EB11E-C6 Física
Ondas e Propriedades OndulatóriasUECE · 2013MédioEntre para guardar nos favoritosConsidere uma onda transversal que se propaga em uma corda muito extensa. Sobre a velocidade de propagação dessa onda, é correto afirmar-se que
869B134E-C6 Física
DinâmicaUECE · 2013MédioEntre para guardar nos favoritosConsidere dois corpos A e B de massas iguais a m. Sobre A, atua somente uma força elétrica, com módulo FE, e sobre B, apenas seu peso, cujo módulo é FP. Os módulos das acelerações dos corpos A e B são, respectivamente,86981E7B-C6 Física
CinemáticaUECE · 2013FácilEntre para guardar nos favoritosConsidere uma esfera metálica em queda livre sob a ação somente da força peso. Sobre o módulo do momento linear desse corpo, pode-se afirmar corretamente que