Matemática
Geometria PlanaFGV · 2016MédioEntre para guardar nos favoritosNo plano cartesiano, a região determinada pelas inequações simultâneas x 2 + y 2 ≤ 4 e x + y ≤ 0 tem área igual a:
Questões do ENEM: nível médio
Use os filtros para chegar às questões que interessam. Cada resultado abre em uma página própria com enunciado, alternativas e gabarito.
- Filtrando por
- MédioRemover este filtro
Resultados
27.392 questões encontradas. Mostrando a página 737 de 1370.
29BCA605-1C 29B372B2-1C Matemática
Geometria PlanaFGV · 2016MédioEntre para guardar nos favoritosUm fazendeiro dispõe de material para construir 60 metros de cerca em uma região retangular, com um lado adjacente a um rio.
Sabendo que ele não pretende colocar cerca no lado do retângulo adjacente ao rio, a área máxima da superfície que conseguirá cercar é:
29AFC024-1C Matemática
Geometria AnalíticaFGV · 2016MédioEntre para guardar nos favoritosOs pares(y,x ) dados abaixo pertencem a uma reta ( r )do plano cartesiano:
Podemos afirmar que
2D861273-A6 Inglês
Interpretação de texto | Reading comprehensionUEMG · 2016MédioEntre para guardar nos favoritosHow a young student’s innovative idea hopes to boost response times for EMTsBy Woody Brown on June 1, 2015Drones have been at the forefront of the national conversation for years now. As the components needed to create them grow smaller and more affordable, many companies and organizations have started exploring the potential that drones could have to improve our daily lives. Whether by delivering a product with unprecedented speed or taking photographs and video from new heights, drones have many capabilities, most of which we have yet to discover. One young man, however, has envisioned a new way to use drones that could save thousands of lives.One of the greatest obstacles facing first responders and emergency medical technicians [EMTs] when it comes to the difficult business of saving lives is time. Think of your daily commute: people in the United States spend an average of 25.5 minutes traveling one-way to work every day. In bumperto-bumper traffic, blaring sirens and flashing lights are often not enough to clear a fast path for an ambulance to reach someone in need. During cardiac arrest, there are, at most, a few minutes to save a person’s life. After that, the mortality rate rises steeply. With stakes this high, every second counts.
Alec Momont, a graduate student in engineering at Delft University of Technology in the Netherlands, recognized this problem and saw a way to significantly reduce deaths that result from delayed emergency care. What if ambulances could fly? Or rather, what if we could make a drone that functioned like a stripped-down, lightweight automatic external defibrillator [AED]? AEDs, which can be found in schools, sports arenas and many government buildings, are significantly more effective than cardiopulmonary resuscitation [CPR] at preventing fatalities resulting from cardiac arrest. CPR can be helpful, but an AED is better, and very few people have AEDs in their cars or homes.
As his master’s degree project, Momont built a prototype of this lifesaving drone. It contained an AED, a microphone and speakers. The average travel time, according to him, could be cut by 90 percent. Here’s how it works: In the event of cardiac arrest, a paramedic would respond to a call by flying the drone at a speed of 60 mph to the scene of the emergency. The paramedic would then give instructions to someone near the victim, who would position the AED. Once in place, the AED would operate automatically. The paramedic would be able to see through the camera whether or not the pads on the AED have been correctly positioned, and how the victim responds.
A dramatized video released by Momont’s university demonstrates all of this functionality. In it, a young woman calls emergency services in a panic because her father has had a heart attack. A calm-voiced EMT answers and guides her through the surprisingly simple process of finding and using the drone. Fewer than two minutes after she makes the call, her father sits up and hugs her.The ambulance drone can increase the chances of surviving cardiac arrest from eight percent to 80 percent, Momont says in the video. The drone’s ability to travel as the crow flies frees it from infrastructural limitations that currently impede road-bound ambulances. “Using advanced production techniques such as 3D printed microstructures and carbon fiber frame construction, we were able to achieve a very lightweight design,” Momont says. “The result is an integrated solution that is clear in its orientation and friendly in appearance.”Momont’s aim is to rapidly expand the existing framework of emergency services by constructing many of these drones over the next five years. Expenses are low: each drone is relatively cheap to make, about $18,600. By comparison, a typical ambulance costs more than $100,000, and a ride in one usually costs more than $1,000.The ambulance drones can even fly autonomously (though legislation in many countries does not permit this yet). Several emergency service providers have already expressed interest. If the technology continues to receive financial support from other parties in the healthcare industry, Momont’s dream could very easily become a reality.We live in a world where drones have, so far, been used mostly in armed conflict. Momont, however, has a different vision. In the near future that he describes, tens of thousands of needless deaths will be prevented with his ingenious invention. That is certainly welcome news, especially in the United States, which deals with skyrocketing numbers of heart-related ailments and disabilities. “Let’s use drones for a good purpose,” Momont says. “Let us use drones to save lives.”Adapted from: <http://www.verizonwireless.com/news/article/2015/05/ambulance-dronescould-save-thousands-of-lives.html>. Access on: 03 Oct. 2016.The following statements are based on the information presented in the text:I- Life-saving drones are more economically viable than ordinary ambulances.II- As ambulance drones are lightweight, they can fly autonomously.III- Drones reach an average speed of 60mph, because their frame is made of carbon fiber.IV- Once drones are able to travel as the crow flies, they can escape from the traffic jams and arrive fast at the emergency scene.The correct statements are2D826008-A6 Inglês
Interpretação de texto | Reading comprehensionUEMG · 2016MédioEntre para guardar nos favoritosHow a young student’s innovative idea hopes to boost response times for EMTsBy Woody Brown on June 1, 2015Drones have been at the forefront of the national conversation for years now. As the components needed to create them grow smaller and more affordable, many companies and organizations have started exploring the potential that drones could have to improve our daily lives. Whether by delivering a product with unprecedented speed or taking photographs and video from new heights, drones have many capabilities, most of which we have yet to discover. One young man, however, has envisioned a new way to use drones that could save thousands of lives.One of the greatest obstacles facing first responders and emergency medical technicians [EMTs] when it comes to the difficult business of saving lives is time. Think of your daily commute: people in the United States spend an average of 25.5 minutes traveling one-way to work every day. In bumperto-bumper traffic, blaring sirens and flashing lights are often not enough to clear a fast path for an ambulance to reach someone in need. During cardiac arrest, there are, at most, a few minutes to save a person’s life. After that, the mortality rate rises steeply. With stakes this high, every second counts.
Alec Momont, a graduate student in engineering at Delft University of Technology in the Netherlands, recognized this problem and saw a way to significantly reduce deaths that result from delayed emergency care. What if ambulances could fly? Or rather, what if we could make a drone that functioned like a stripped-down, lightweight automatic external defibrillator [AED]? AEDs, which can be found in schools, sports arenas and many government buildings, are significantly more effective than cardiopulmonary resuscitation [CPR] at preventing fatalities resulting from cardiac arrest. CPR can be helpful, but an AED is better, and very few people have AEDs in their cars or homes.
As his master’s degree project, Momont built a prototype of this lifesaving drone. It contained an AED, a microphone and speakers. The average travel time, according to him, could be cut by 90 percent. Here’s how it works: In the event of cardiac arrest, a paramedic would respond to a call by flying the drone at a speed of 60 mph to the scene of the emergency. The paramedic would then give instructions to someone near the victim, who would position the AED. Once in place, the AED would operate automatically. The paramedic would be able to see through the camera whether or not the pads on the AED have been correctly positioned, and how the victim responds.
A dramatized video released by Momont’s university demonstrates all of this functionality. In it, a young woman calls emergency services in a panic because her father has had a heart attack. A calm-voiced EMT answers and guides her through the surprisingly simple process of finding and using the drone. Fewer than two minutes after she makes the call, her father sits up and hugs her.The ambulance drone can increase the chances of surviving cardiac arrest from eight percent to 80 percent, Momont says in the video. The drone’s ability to travel as the crow flies frees it from infrastructural limitations that currently impede road-bound ambulances. “Using advanced production techniques such as 3D printed microstructures and carbon fiber frame construction, we were able to achieve a very lightweight design,” Momont says. “The result is an integrated solution that is clear in its orientation and friendly in appearance.”Momont’s aim is to rapidly expand the existing framework of emergency services by constructing many of these drones over the next five years. Expenses are low: each drone is relatively cheap to make, about $18,600. By comparison, a typical ambulance costs more than $100,000, and a ride in one usually costs more than $1,000.The ambulance drones can even fly autonomously (though legislation in many countries does not permit this yet). Several emergency service providers have already expressed interest. If the technology continues to receive financial support from other parties in the healthcare industry, Momont’s dream could very easily become a reality.We live in a world where drones have, so far, been used mostly in armed conflict. Momont, however, has a different vision. In the near future that he describes, tens of thousands of needless deaths will be prevented with his ingenious invention. That is certainly welcome news, especially in the United States, which deals with skyrocketing numbers of heart-related ailments and disabilities. “Let’s use drones for a good purpose,” Momont says. “Let us use drones to save lives.”Adapted from: <http://www.verizonwireless.com/news/article/2015/05/ambulance-dronescould-save-thousands-of-lives.html>. Access on: 03 Oct. 2016.The main purpose of this text is to2D7E9320-A6 Inglês
Interpretação de texto | Reading comprehensionUEMG · 2016MédioEntre para guardar nos favoritosHow a young student’s innovative idea hopes to boost response times for EMTsBy Woody Brown on June 1, 2015Drones have been at the forefront of the national conversation for years now. As the components needed to create them grow smaller and more affordable, many companies and organizations have started exploring the potential that drones could have to improve our daily lives. Whether by delivering a product with unprecedented speed or taking photographs and video from new heights, drones have many capabilities, most of which we have yet to discover. One young man, however, has envisioned a new way to use drones that could save thousands of lives.One of the greatest obstacles facing first responders and emergency medical technicians [EMTs] when it comes to the difficult business of saving lives is time. Think of your daily commute: people in the United States spend an average of 25.5 minutes traveling one-way to work every day. In bumperto-bumper traffic, blaring sirens and flashing lights are often not enough to clear a fast path for an ambulance to reach someone in need. During cardiac arrest, there are, at most, a few minutes to save a person’s life. After that, the mortality rate rises steeply. With stakes this high, every second counts.
Alec Momont, a graduate student in engineering at Delft University of Technology in the Netherlands, recognized this problem and saw a way to significantly reduce deaths that result from delayed emergency care. What if ambulances could fly? Or rather, what if we could make a drone that functioned like a stripped-down, lightweight automatic external defibrillator [AED]? AEDs, which can be found in schools, sports arenas and many government buildings, are significantly more effective than cardiopulmonary resuscitation [CPR] at preventing fatalities resulting from cardiac arrest. CPR can be helpful, but an AED is better, and very few people have AEDs in their cars or homes.
As his master’s degree project, Momont built a prototype of this lifesaving drone. It contained an AED, a microphone and speakers. The average travel time, according to him, could be cut by 90 percent. Here’s how it works: In the event of cardiac arrest, a paramedic would respond to a call by flying the drone at a speed of 60 mph to the scene of the emergency. The paramedic would then give instructions to someone near the victim, who would position the AED. Once in place, the AED would operate automatically. The paramedic would be able to see through the camera whether or not the pads on the AED have been correctly positioned, and how the victim responds.
A dramatized video released by Momont’s university demonstrates all of this functionality. In it, a young woman calls emergency services in a panic because her father has had a heart attack. A calm-voiced EMT answers and guides her through the surprisingly simple process of finding and using the drone. Fewer than two minutes after she makes the call, her father sits up and hugs her.The ambulance drone can increase the chances of surviving cardiac arrest from eight percent to 80 percent, Momont says in the video. The drone’s ability to travel as the crow flies frees it from infrastructural limitations that currently impede road-bound ambulances. “Using advanced production techniques such as 3D printed microstructures and carbon fiber frame construction, we were able to achieve a very lightweight design,” Momont says. “The result is an integrated solution that is clear in its orientation and friendly in appearance.”Momont’s aim is to rapidly expand the existing framework of emergency services by constructing many of these drones over the next five years. Expenses are low: each drone is relatively cheap to make, about $18,600. By comparison, a typical ambulance costs more than $100,000, and a ride in one usually costs more than $1,000.The ambulance drones can even fly autonomously (though legislation in many countries does not permit this yet). Several emergency service providers have already expressed interest. If the technology continues to receive financial support from other parties in the healthcare industry, Momont’s dream could very easily become a reality.We live in a world where drones have, so far, been used mostly in armed conflict. Momont, however, has a different vision. In the near future that he describes, tens of thousands of needless deaths will be prevented with his ingenious invention. That is certainly welcome news, especially in the United States, which deals with skyrocketing numbers of heart-related ailments and disabilities. “Let’s use drones for a good purpose,” Momont says. “Let us use drones to save lives.”Adapted from: <http://www.verizonwireless.com/news/article/2015/05/ambulance-dronescould-save-thousands-of-lives.html>. Access on: 03 Oct. 2016.The use of CAN in paragraphs 3 and 6 reveals the idea o2D7AE281-A6 Inglês
Adjetivos | AdjectivesUEMG · 2016MédioEntre para guardar nos favoritosHow a young student’s innovative idea hopes to boost response times for EMTsBy Woody Brown on June 1, 2015Drones have been at the forefront of the national conversation for years now. As the components needed to create them grow smaller and more affordable, many companies and organizations have started exploring the potential that drones could have to improve our daily lives. Whether by delivering a product with unprecedented speed or taking photographs and video from new heights, drones have many capabilities, most of which we have yet to discover. One young man, however, has envisioned a new way to use drones that could save thousands of lives.One of the greatest obstacles facing first responders and emergency medical technicians [EMTs] when it comes to the difficult business of saving lives is time. Think of your daily commute: people in the United States spend an average of 25.5 minutes traveling one-way to work every day. In bumperto-bumper traffic, blaring sirens and flashing lights are often not enough to clear a fast path for an ambulance to reach someone in need. During cardiac arrest, there are, at most, a few minutes to save a person’s life. After that, the mortality rate rises steeply. With stakes this high, every second counts.
Alec Momont, a graduate student in engineering at Delft University of Technology in the Netherlands, recognized this problem and saw a way to significantly reduce deaths that result from delayed emergency care. What if ambulances could fly? Or rather, what if we could make a drone that functioned like a stripped-down, lightweight automatic external defibrillator [AED]? AEDs, which can be found in schools, sports arenas and many government buildings, are significantly more effective than cardiopulmonary resuscitation [CPR] at preventing fatalities resulting from cardiac arrest. CPR can be helpful, but an AED is better, and very few people have AEDs in their cars or homes.
As his master’s degree project, Momont built a prototype of this lifesaving drone. It contained an AED, a microphone and speakers. The average travel time, according to him, could be cut by 90 percent. Here’s how it works: In the event of cardiac arrest, a paramedic would respond to a call by flying the drone at a speed of 60 mph to the scene of the emergency. The paramedic would then give instructions to someone near the victim, who would position the AED. Once in place, the AED would operate automatically. The paramedic would be able to see through the camera whether or not the pads on the AED have been correctly positioned, and how the victim responds.
A dramatized video released by Momont’s university demonstrates all of this functionality. In it, a young woman calls emergency services in a panic because her father has had a heart attack. A calm-voiced EMT answers and guides her through the surprisingly simple process of finding and using the drone. Fewer than two minutes after she makes the call, her father sits up and hugs her.The ambulance drone can increase the chances of surviving cardiac arrest from eight percent to 80 percent, Momont says in the video. The drone’s ability to travel as the crow flies frees it from infrastructural limitations that currently impede road-bound ambulances. “Using advanced production techniques such as 3D printed microstructures and carbon fiber frame construction, we were able to achieve a very lightweight design,” Momont says. “The result is an integrated solution that is clear in its orientation and friendly in appearance.”Momont’s aim is to rapidly expand the existing framework of emergency services by constructing many of these drones over the next five years. Expenses are low: each drone is relatively cheap to make, about $18,600. By comparison, a typical ambulance costs more than $100,000, and a ride in one usually costs more than $1,000.The ambulance drones can even fly autonomously (though legislation in many countries does not permit this yet). Several emergency service providers have already expressed interest. If the technology continues to receive financial support from other parties in the healthcare industry, Momont’s dream could very easily become a reality.We live in a world where drones have, so far, been used mostly in armed conflict. Momont, however, has a different vision. In the near future that he describes, tens of thousands of needless deaths will be prevented with his ingenious invention. That is certainly welcome news, especially in the United States, which deals with skyrocketing numbers of heart-related ailments and disabilities. “Let’s use drones for a good purpose,” Momont says. “Let us use drones to save lives.”Adapted from: <http://www.verizonwireless.com/news/article/2015/05/ambulance-dronescould-save-thousands-of-lives.html>. Access on: 03 Oct. 2016.The word that functions as an adjective in the text is2D777F3B-A6 Inglês
Pronomes | PronounsUEMG · 2016MédioEntre para guardar nos favoritosHow a young student’s innovative idea hopes to boost response times for EMTsBy Woody Brown on June 1, 2015Drones have been at the forefront of the national conversation for years now. As the components needed to create them grow smaller and more affordable, many companies and organizations have started exploring the potential that drones could have to improve our daily lives. Whether by delivering a product with unprecedented speed or taking photographs and video from new heights, drones have many capabilities, most of which we have yet to discover. One young man, however, has envisioned a new way to use drones that could save thousands of lives.One of the greatest obstacles facing first responders and emergency medical technicians [EMTs] when it comes to the difficult business of saving lives is time. Think of your daily commute: people in the United States spend an average of 25.5 minutes traveling one-way to work every day. In bumperto-bumper traffic, blaring sirens and flashing lights are often not enough to clear a fast path for an ambulance to reach someone in need. During cardiac arrest, there are, at most, a few minutes to save a person’s life. After that, the mortality rate rises steeply. With stakes this high, every second counts.
Alec Momont, a graduate student in engineering at Delft University of Technology in the Netherlands, recognized this problem and saw a way to significantly reduce deaths that result from delayed emergency care. What if ambulances could fly? Or rather, what if we could make a drone that functioned like a stripped-down, lightweight automatic external defibrillator [AED]? AEDs, which can be found in schools, sports arenas and many government buildings, are significantly more effective than cardiopulmonary resuscitation [CPR] at preventing fatalities resulting from cardiac arrest. CPR can be helpful, but an AED is better, and very few people have AEDs in their cars or homes.
As his master’s degree project, Momont built a prototype of this lifesaving drone. It contained an AED, a microphone and speakers. The average travel time, according to him, could be cut by 90 percent. Here’s how it works: In the event of cardiac arrest, a paramedic would respond to a call by flying the drone at a speed of 60 mph to the scene of the emergency. The paramedic would then give instructions to someone near the victim, who would position the AED. Once in place, the AED would operate automatically. The paramedic would be able to see through the camera whether or not the pads on the AED have been correctly positioned, and how the victim responds.
A dramatized video released by Momont’s university demonstrates all of this functionality. In it, a young woman calls emergency services in a panic because her father has had a heart attack. A calm-voiced EMT answers and guides her through the surprisingly simple process of finding and using the drone. Fewer than two minutes after she makes the call, her father sits up and hugs her.The ambulance drone can increase the chances of surviving cardiac arrest from eight percent to 80 percent, Momont says in the video. The drone’s ability to travel as the crow flies frees it from infrastructural limitations that currently impede road-bound ambulances. “Using advanced production techniques such as 3D printed microstructures and carbon fiber frame construction, we were able to achieve a very lightweight design,” Momont says. “The result is an integrated solution that is clear in its orientation and friendly in appearance.”Momont’s aim is to rapidly expand the existing framework of emergency services by constructing many of these drones over the next five years. Expenses are low: each drone is relatively cheap to make, about $18,600. By comparison, a typical ambulance costs more than $100,000, and a ride in one usually costs more than $1,000.The ambulance drones can even fly autonomously (though legislation in many countries does not permit this yet). Several emergency service providers have already expressed interest. If the technology continues to receive financial support from other parties in the healthcare industry, Momont’s dream could very easily become a reality.We live in a world where drones have, so far, been used mostly in armed conflict. Momont, however, has a different vision. In the near future that he describes, tens of thousands of needless deaths will be prevented with his ingenious invention. That is certainly welcome news, especially in the United States, which deals with skyrocketing numbers of heart-related ailments and disabilities. “Let’s use drones for a good purpose,” Momont says. “Let us use drones to save lives.”Adapted from: <http://www.verizonwireless.com/news/article/2015/05/ambulance-dronescould-save-thousands-of-lives.html>. Access on: 03 Oct. 2016.Mark T (true) and F (false) for the correlations between pronouns and their referents in the text.a) ( ) it (paragraph 5) – video.b) ( ) who (paragraph 4) – victim.c) ( ) them (paragraph 1) – drones.d) ( ) which (paragraph 1) – capabilities.The correct sequence is
2D69680B-A6 Geografia
Geografia PolíticaUEMG · 2016MédioEntre para guardar nos favoritosSobre a Questão da Geopolítica mundial, afirma-se:I- Atualmente, verificam-se práticas de terrorismo internacional como formas de contestação do poder do mundo Ocidental.II- A criação do Sudão do Sul teve como origem a guerra entre os Estados Chade e Sudão no século XXI.III- As atividades ilícitas em rede, ampliadas pela globalização, ameaçam a soberania dos Estados-nação.IV- O Estado Palestino mantém sua autonomia sobre a totalidade das regiões da Cisjordânia e da Faixa de Gaza.Estão corretas apenas as afirmativas2D65A001-A6 Geografia
GeologiaUEMG · 2016MédioEntre para guardar nos favoritosAnalise o mapa a seguir:
ROSS, Jurandyr (Org.). Geografia do Brasil. São Paulo: Edusp, 2000. p. 178. Adaptado.Sobre as formações vegetais, indicadas no mapa do Brasil pelas letras A e B, afirma-se:I- A formação A é caracterizada pela presença de árvores, geralmente tortuosas e espaçadas, com pluviosidade média acima de 3000 mm anuais.II- O tipo vegetacional B está assentado em solos de baixa fertilidade, relacionada aos volumes reduzidos de precipitação, normalmente concentrados no verão.III- A vegetação A tem sofrido redução da sua área de cobertura em função do avanço dos projetos de monoculturas de soja e pastagens.IV- Em B, encontram-se espécies com elementos de adaptação à escassez de pluviosidade, como revestimento dos tecidos, folhas grossas, folhas miúdas e em formato de espinho.São corretas apenas as afirmativas
2D61F13A-A6 Geografia
CartografiaUEMG · 2016MédioEntre para guardar nos favoritosAnalise a imagem a seguir:
SIMIELLI, Maria Elena. Geoatlas. São Paulo: Ática, 2013. p. 9. Adaptado.O objetivo da elaboração dessa representação cartográfica é mostrar
2D5EEE98-A6 Geografia
Geografia FísicaUEMG · 2016MédioEntre para guardar nos favoritosAnalise os gráficos a seguir:
TEIXEIRA, Wilson et al. (Orgs.). Decifrando a Terra. 2. ed. São Paulo: Cia Editora Nacional, 2009. p. 451.Sobre o uso dos recursos hídricos pelas diversas atividades humanas, é correto afirmar que2D5478FB-A6 Biologia
Introdução ao metabolismo energéticoUEMG · 2016MédioEntre para guardar nos favoritosAnalise o esquema, a seguir, que representa as três etapas de um processo metabólico energético.
Fonte: CAMPBELL, Neil e colaboradores. Biologia. Editora Artmed. 8ª edição, 2010, p.176.Sobre esse processo metabólico, é correto afirmar que
2D50A851-A6 Biologia
Identidade dos seres vivosUEMG · 2016MédioEntre para guardar nos favoritosAnalise a representação gráfica do ciclo ovariano regular de 28 dias, mostrado a seguir.
Disponível em <http://drasilviasouza.files.wordpress.com/2011/08/menstrual_cycle.jpg>. Acesso em 05 set 2016.O hormônio 4 tem como função
2D4D0767-A6 Biologia
Herança ligada ao sexoUEMG · 2016MédioEntre para guardar nos favoritosAnalise o heredograma sobre a herança da distrofia muscular de Duchenne, uma doença degenerativa, determinada por gene recessivo, ligado ao cromossomo X representado a seguir. Os indivíduos I.1 e II.1 são afetados pela herança.
A probabilidade do descendente III.2 ser uma menina afetada será de
2D496AFC-A6 Biologia
Identidade dos seres vivosUEMG · 2016MédioEntre para guardar nos favoritosO procedimento cotidiano adequado para se retardar o amadurecimento de um mamão é2D460CB1-A6 Química
Fórmulas, Balanceamento e Leis ponderais das reações químicasUEMG · 2016MédioEntre para guardar nos favoritosO Diesel S-10 foi lançado em 2013 e teve por objetivo diminuir a emissão de dióxido de enxofre na atmosfera, um dos principais causadores da chuva ácida. O termo S-10 significa que, para cada quilograma de Diesel, o teor de enxofre é de 10 mg. Considere que o enxofre presente no Diesel S-10 esteja na forma do alótropo S8 e que, ao sofrer combustão, forme apenas dióxido de enxofre.O número de mols de dióxido de enxofre, formado a partir da combustão de 1000L de Diesel S-10, é, aproximadamente,Dado: Densidade do Diesel S-10 = 0,8 kg/L
2D3BDBDD-A6 Química
Estudo da matéria: substâncias, misturas, processos de separação.UEMG · 2016MédioEntre para guardar nos favoritosUma mistura formada por água, CCl4 e sal de cozinha (NaCl) passou por dois processos físicos com o objetivo de separar todos os seus componentes.Considere o fluxograma e as afirmações sobre as características dos referidos processos:
I- O processo de separação II é uma filtração.II- A mistura restante é uma solução homogênea.III- O processo de separação I corresponde a uma decantação.IV- As substâncias puras II e III correspondem a dois líquidos à temperatura ambiente.São corretas apenas as afirmativas2D35676A-A6 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.UEMG · 2016MédioEntre para guardar nos favoritosObserve o composto orgânico abaixo e as afirmações a seu respeito.
I - É um álcool insaturado.II- É um isômero cis-trans.III- Apresenta 18 hidrogênios.IV- Apresenta 3 ramificações.O número de afirmação(ões) correta(s) é igual a2D31EAD9-A6 Matemática
Sistemas LinearesUEMG · 2016MédioEntre para guardar nos favoritosConsidere o seguinte sistema:
Na solução desse sistema, tem-se x = a e y = b. Assim, o valor da expressão
é