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  • Linguagens

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    TEXT

        A library tradition is being refashioned to emphasize early literacy and better prepare young children for school, and drawing many new fans in the process.

        Among parents of the under-5 set, spots for story time have become as coveted as seats for a hot Broadway show like “Hamilton.” Lines stretch down the block at some branches, with tickets given out on a first-come-first-served basis because there is not enough room to accommodate all of the children who show up.

        Workers at the 67th Street Library on the Upper East Side of Manhattan turn away at least 10 people from every reading. They have been so overwhelmed by the rush at story time — held in the branch’s largest room, on the third floor — that once the space is full, they close the door and shut down the elevator. “It is so crowded and so popular, it’s insane,” Jacqueline Schector, a librarian, said.

        Story time is drawing capacity crowds at public libraries across New York and across the country at a time when, more than ever, educators are emphasizing the importance of early literacy in preparing children for school and for developing critical thinking skills. The demand crosses economic lines, with parents at all income levels vying to get in.

        Many libraries have refashioned the traditional readings to include enrichment activities such as counting numbers and naming colors, as well as music and dance. And many parents have made story time a fixture in their family routines alongside school pickups and playground outings — and, for those who employ nannies, a nonnegotiable requirement of the job.

        In New York, demand for story time has surged across the city’s three library systems — the New York Public Library, the Brooklyn Public Library, and the Queens Library — and has posed logistical challenges for some branches, particularly those in small or cramped buildings. Citywide, story time attendance rose to 510,367 people in fiscal year 2015, up nearly 28 percent from 399,751 in fiscal 2013.

        “The secret’s out,” said Lucy Yates, 44, an opera coach with two sons who goes to story time at the Fort Washington Library every week.

        Stroller-pushing parents and nannies begin to line up for story time outside some branches an hour before doors open. To prevent overcrowding, tickets are given out at the New Amsterdam and Webster branches, both in Manhattan, the Parkchester branch in the Bronx, and a half-dozen branches in Brooklyn, including in Park Slope, Kensington and Bay Ridge.

        The 67th Street branch keeps adding story times — there are now six a week — and holds sessions outdoors in the summer, when crowds can swell to 200 people.

        In Queens, 41 library branches are scheduled to add weekend hours this month, and many will undoubtedly include weekend story times. As Joanne King, a spokeswoman for the library explained, parents have been begging for them and “every story time is full, every time we have one.”

        Long a library staple, story time has typically been an informal reading to a small group of boys and girls sitting in a circle. Today’s story times involve carefully planned lessons by specially trained librarians that emphasize education as much as entertainment, and often include suggestions for parents and caregivers about how to reinforce what children have learned, library officials said.

        Libraries around the country have expanded story time and other children’s programs in recent years, attracting a new generation of patrons in an age when online offerings sometimes make trips to the book stacks unnecessary. Sari Feldman, president of the American Library Association, said such early-literacy efforts are part of a larger transformation libraries are undergoing to become active learning centers for their communities by offering services like classes in English as a second language, computer skills and career counseling.

        Ms. Feldman said the increased demand for story time was a product, in part, of more than a decade of work by the library association and others to encourage libraries to play a larger role in preparing young children for school. In 2004, as part of that effort, the association developed a curriculum, “Every Child Ready to Read,” that she said is now used by thousands of libraries.

        The New York Public Library is adding 45 children’s librarians to support story time and other programs, some of which are run in partnership with the city government. It has also designated 20 of its 88 neighborhood branches, including the Fort Washington Library, as “enhanced literary sites.” As such, they will double their story time sessions, to an average of four a week, and distribute 15,000 “family literacy kits” that include a book and a schedule of story times.

        “It is clear that reading and being exposed to books early in life are critical factors in student success,” Anthony W. Marx, president of the New York Public Library, said. “The library is playing an increasingly important role in strengthening early literacy in this city, expanding efforts to bring reading to children and their families through quality, free story times, curated literacy programs, after-school programs and more.”

        For its part, the Queens Library plans to expand a “Kick Off to Kindergarten” program that attracted more than 180 families for a series of workshops last year. Library officials said that more than three-quarters of the children who enrolled, many of whom spoke a language other than English at home, developed measurable classroom skills.

    From: www.nytimes.com/2015/11/02

    In “The new York Public Library is adding 45 children's librarians to support story time and other programs...” the two verb forms are, respectively,
    Escolha uma alternativa para a questão 0d9b81c4-91
  • Linguagens

    Inglês

    TEXT

        A library tradition is being refashioned to emphasize early literacy and better prepare young children for school, and drawing many new fans in the process.

        Among parents of the under-5 set, spots for story time have become as coveted as seats for a hot Broadway show like “Hamilton.” Lines stretch down the block at some branches, with tickets given out on a first-come-first-served basis because there is not enough room to accommodate all of the children who show up.

        Workers at the 67th Street Library on the Upper East Side of Manhattan turn away at least 10 people from every reading. They have been so overwhelmed by the rush at story time — held in the branch’s largest room, on the third floor — that once the space is full, they close the door and shut down the elevator. “It is so crowded and so popular, it’s insane,” Jacqueline Schector, a librarian, said.

        Story time is drawing capacity crowds at public libraries across New York and across the country at a time when, more than ever, educators are emphasizing the importance of early literacy in preparing children for school and for developing critical thinking skills. The demand crosses economic lines, with parents at all income levels vying to get in.

        Many libraries have refashioned the traditional readings to include enrichment activities such as counting numbers and naming colors, as well as music and dance. And many parents have made story time a fixture in their family routines alongside school pickups and playground outings — and, for those who employ nannies, a nonnegotiable requirement of the job.

        In New York, demand for story time has surged across the city’s three library systems — the New York Public Library, the Brooklyn Public Library, and the Queens Library — and has posed logistical challenges for some branches, particularly those in small or cramped buildings. Citywide, story time attendance rose to 510,367 people in fiscal year 2015, up nearly 28 percent from 399,751 in fiscal 2013.

        “The secret’s out,” said Lucy Yates, 44, an opera coach with two sons who goes to story time at the Fort Washington Library every week.

        Stroller-pushing parents and nannies begin to line up for story time outside some branches an hour before doors open. To prevent overcrowding, tickets are given out at the New Amsterdam and Webster branches, both in Manhattan, the Parkchester branch in the Bronx, and a half-dozen branches in Brooklyn, including in Park Slope, Kensington and Bay Ridge.

        The 67th Street branch keeps adding story times — there are now six a week — and holds sessions outdoors in the summer, when crowds can swell to 200 people.

        In Queens, 41 library branches are scheduled to add weekend hours this month, and many will undoubtedly include weekend story times. As Joanne King, a spokeswoman for the library explained, parents have been begging for them and “every story time is full, every time we have one.”

        Long a library staple, story time has typically been an informal reading to a small group of boys and girls sitting in a circle. Today’s story times involve carefully planned lessons by specially trained librarians that emphasize education as much as entertainment, and often include suggestions for parents and caregivers about how to reinforce what children have learned, library officials said.

        Libraries around the country have expanded story time and other children’s programs in recent years, attracting a new generation of patrons in an age when online offerings sometimes make trips to the book stacks unnecessary. Sari Feldman, president of the American Library Association, said such early-literacy efforts are part of a larger transformation libraries are undergoing to become active learning centers for their communities by offering services like classes in English as a second language, computer skills and career counseling.

        Ms. Feldman said the increased demand for story time was a product, in part, of more than a decade of work by the library association and others to encourage libraries to play a larger role in preparing young children for school. In 2004, as part of that effort, the association developed a curriculum, “Every Child Ready to Read,” that she said is now used by thousands of libraries.

        The New York Public Library is adding 45 children’s librarians to support story time and other programs, some of which are run in partnership with the city government. It has also designated 20 of its 88 neighborhood branches, including the Fort Washington Library, as “enhanced literary sites.” As such, they will double their story time sessions, to an average of four a week, and distribute 15,000 “family literacy kits” that include a book and a schedule of story times.

        “It is clear that reading and being exposed to books early in life are critical factors in student success,” Anthony W. Marx, president of the New York Public Library, said. “The library is playing an increasingly important role in strengthening early literacy in this city, expanding efforts to bring reading to children and their families through quality, free story times, curated literacy programs, after-school programs and more.”

        For its part, the Queens Library plans to expand a “Kick Off to Kindergarten” program that attracted more than 180 families for a series of workshops last year. Library officials said that more than three-quarters of the children who enrolled, many of whom spoke a language other than English at home, developed measurable classroom skills.

    From: www.nytimes.com/2015/11/02

    In “...and many parents have made story time a fixture in their family routines...” the verb tense is
    Escolha uma alternativa para a questão 0d929117-91
  • Linguagens

    Inglês

    TEXT

        A library tradition is being refashioned to emphasize early literacy and better prepare young children for school, and drawing many new fans in the process.

        Among parents of the under-5 set, spots for story time have become as coveted as seats for a hot Broadway show like “Hamilton.” Lines stretch down the block at some branches, with tickets given out on a first-come-first-served basis because there is not enough room to accommodate all of the children who show up.

        Workers at the 67th Street Library on the Upper East Side of Manhattan turn away at least 10 people from every reading. They have been so overwhelmed by the rush at story time — held in the branch’s largest room, on the third floor — that once the space is full, they close the door and shut down the elevator. “It is so crowded and so popular, it’s insane,” Jacqueline Schector, a librarian, said.

        Story time is drawing capacity crowds at public libraries across New York and across the country at a time when, more than ever, educators are emphasizing the importance of early literacy in preparing children for school and for developing critical thinking skills. The demand crosses economic lines, with parents at all income levels vying to get in.

        Many libraries have refashioned the traditional readings to include enrichment activities such as counting numbers and naming colors, as well as music and dance. And many parents have made story time a fixture in their family routines alongside school pickups and playground outings — and, for those who employ nannies, a nonnegotiable requirement of the job.

        In New York, demand for story time has surged across the city’s three library systems — the New York Public Library, the Brooklyn Public Library, and the Queens Library — and has posed logistical challenges for some branches, particularly those in small or cramped buildings. Citywide, story time attendance rose to 510,367 people in fiscal year 2015, up nearly 28 percent from 399,751 in fiscal 2013.

        “The secret’s out,” said Lucy Yates, 44, an opera coach with two sons who goes to story time at the Fort Washington Library every week.

        Stroller-pushing parents and nannies begin to line up for story time outside some branches an hour before doors open. To prevent overcrowding, tickets are given out at the New Amsterdam and Webster branches, both in Manhattan, the Parkchester branch in the Bronx, and a half-dozen branches in Brooklyn, including in Park Slope, Kensington and Bay Ridge.

        The 67th Street branch keeps adding story times — there are now six a week — and holds sessions outdoors in the summer, when crowds can swell to 200 people.

        In Queens, 41 library branches are scheduled to add weekend hours this month, and many will undoubtedly include weekend story times. As Joanne King, a spokeswoman for the library explained, parents have been begging for them and “every story time is full, every time we have one.”

        Long a library staple, story time has typically been an informal reading to a small group of boys and girls sitting in a circle. Today’s story times involve carefully planned lessons by specially trained librarians that emphasize education as much as entertainment, and often include suggestions for parents and caregivers about how to reinforce what children have learned, library officials said.

        Libraries around the country have expanded story time and other children’s programs in recent years, attracting a new generation of patrons in an age when online offerings sometimes make trips to the book stacks unnecessary. Sari Feldman, president of the American Library Association, said such early-literacy efforts are part of a larger transformation libraries are undergoing to become active learning centers for their communities by offering services like classes in English as a second language, computer skills and career counseling.

        Ms. Feldman said the increased demand for story time was a product, in part, of more than a decade of work by the library association and others to encourage libraries to play a larger role in preparing young children for school. In 2004, as part of that effort, the association developed a curriculum, “Every Child Ready to Read,” that she said is now used by thousands of libraries.

        The New York Public Library is adding 45 children’s librarians to support story time and other programs, some of which are run in partnership with the city government. It has also designated 20 of its 88 neighborhood branches, including the Fort Washington Library, as “enhanced literary sites.” As such, they will double their story time sessions, to an average of four a week, and distribute 15,000 “family literacy kits” that include a book and a schedule of story times.

        “It is clear that reading and being exposed to books early in life are critical factors in student success,” Anthony W. Marx, president of the New York Public Library, said. “The library is playing an increasingly important role in strengthening early literacy in this city, expanding efforts to bring reading to children and their families through quality, free story times, curated literacy programs, after-school programs and more.”

        For its part, the Queens Library plans to expand a “Kick Off to Kindergarten” program that attracted more than 180 families for a series of workshops last year. Library officials said that more than three-quarters of the children who enrolled, many of whom spoke a language other than English at home, developed measurable classroom skills.

    From: www.nytimes.com/2015/11/02

    One of the amazing facts about story time is that its seats in some of the New York libraries are
    Escolha uma alternativa para a questão 0d866d73-91
  • Linguagens

    Inglês

    TEXT

        A library tradition is being refashioned to emphasize early literacy and better prepare young children for school, and drawing many new fans in the process.

        Among parents of the under-5 set, spots for story time have become as coveted as seats for a hot Broadway show like “Hamilton.” Lines stretch down the block at some branches, with tickets given out on a first-come-first-served basis because there is not enough room to accommodate all of the children who show up.

        Workers at the 67th Street Library on the Upper East Side of Manhattan turn away at least 10 people from every reading. They have been so overwhelmed by the rush at story time — held in the branch’s largest room, on the third floor — that once the space is full, they close the door and shut down the elevator. “It is so crowded and so popular, it’s insane,” Jacqueline Schector, a librarian, said.

        Story time is drawing capacity crowds at public libraries across New York and across the country at a time when, more than ever, educators are emphasizing the importance of early literacy in preparing children for school and for developing critical thinking skills. The demand crosses economic lines, with parents at all income levels vying to get in.

        Many libraries have refashioned the traditional readings to include enrichment activities such as counting numbers and naming colors, as well as music and dance. And many parents have made story time a fixture in their family routines alongside school pickups and playground outings — and, for those who employ nannies, a nonnegotiable requirement of the job.

        In New York, demand for story time has surged across the city’s three library systems — the New York Public Library, the Brooklyn Public Library, and the Queens Library — and has posed logistical challenges for some branches, particularly those in small or cramped buildings. Citywide, story time attendance rose to 510,367 people in fiscal year 2015, up nearly 28 percent from 399,751 in fiscal 2013.

        “The secret’s out,” said Lucy Yates, 44, an opera coach with two sons who goes to story time at the Fort Washington Library every week.

        Stroller-pushing parents and nannies begin to line up for story time outside some branches an hour before doors open. To prevent overcrowding, tickets are given out at the New Amsterdam and Webster branches, both in Manhattan, the Parkchester branch in the Bronx, and a half-dozen branches in Brooklyn, including in Park Slope, Kensington and Bay Ridge.

        The 67th Street branch keeps adding story times — there are now six a week — and holds sessions outdoors in the summer, when crowds can swell to 200 people.

        In Queens, 41 library branches are scheduled to add weekend hours this month, and many will undoubtedly include weekend story times. As Joanne King, a spokeswoman for the library explained, parents have been begging for them and “every story time is full, every time we have one.”

        Long a library staple, story time has typically been an informal reading to a small group of boys and girls sitting in a circle. Today’s story times involve carefully planned lessons by specially trained librarians that emphasize education as much as entertainment, and often include suggestions for parents and caregivers about how to reinforce what children have learned, library officials said.

        Libraries around the country have expanded story time and other children’s programs in recent years, attracting a new generation of patrons in an age when online offerings sometimes make trips to the book stacks unnecessary. Sari Feldman, president of the American Library Association, said such early-literacy efforts are part of a larger transformation libraries are undergoing to become active learning centers for their communities by offering services like classes in English as a second language, computer skills and career counseling.

        Ms. Feldman said the increased demand for story time was a product, in part, of more than a decade of work by the library association and others to encourage libraries to play a larger role in preparing young children for school. In 2004, as part of that effort, the association developed a curriculum, “Every Child Ready to Read,” that she said is now used by thousands of libraries.

        The New York Public Library is adding 45 children’s librarians to support story time and other programs, some of which are run in partnership with the city government. It has also designated 20 of its 88 neighborhood branches, including the Fort Washington Library, as “enhanced literary sites.” As such, they will double their story time sessions, to an average of four a week, and distribute 15,000 “family literacy kits” that include a book and a schedule of story times.

        “It is clear that reading and being exposed to books early in life are critical factors in student success,” Anthony W. Marx, president of the New York Public Library, said. “The library is playing an increasingly important role in strengthening early literacy in this city, expanding efforts to bring reading to children and their families through quality, free story times, curated literacy programs, after-school programs and more.”

        For its part, the Queens Library plans to expand a “Kick Off to Kindergarten” program that attracted more than 180 families for a series of workshops last year. Library officials said that more than three-quarters of the children who enrolled, many of whom spoke a language other than English at home, developed measurable classroom skills.

    From: www.nytimes.com/2015/11/02

    One of the reasons for the relevance of early literacy is that it
    Escolha uma alternativa para a questão 0d7de3ca-91
  • Linguagens

    Inglês

    TEXT

        A library tradition is being refashioned to emphasize early literacy and better prepare young children for school, and drawing many new fans in the process.

        Among parents of the under-5 set, spots for story time have become as coveted as seats for a hot Broadway show like “Hamilton.” Lines stretch down the block at some branches, with tickets given out on a first-come-first-served basis because there is not enough room to accommodate all of the children who show up.

        Workers at the 67th Street Library on the Upper East Side of Manhattan turn away at least 10 people from every reading. They have been so overwhelmed by the rush at story time — held in the branch’s largest room, on the third floor — that once the space is full, they close the door and shut down the elevator. “It is so crowded and so popular, it’s insane,” Jacqueline Schector, a librarian, said.

        Story time is drawing capacity crowds at public libraries across New York and across the country at a time when, more than ever, educators are emphasizing the importance of early literacy in preparing children for school and for developing critical thinking skills. The demand crosses economic lines, with parents at all income levels vying to get in.

        Many libraries have refashioned the traditional readings to include enrichment activities such as counting numbers and naming colors, as well as music and dance. And many parents have made story time a fixture in their family routines alongside school pickups and playground outings — and, for those who employ nannies, a nonnegotiable requirement of the job.

        In New York, demand for story time has surged across the city’s three library systems — the New York Public Library, the Brooklyn Public Library, and the Queens Library — and has posed logistical challenges for some branches, particularly those in small or cramped buildings. Citywide, story time attendance rose to 510,367 people in fiscal year 2015, up nearly 28 percent from 399,751 in fiscal 2013.

        “The secret’s out,” said Lucy Yates, 44, an opera coach with two sons who goes to story time at the Fort Washington Library every week.

        Stroller-pushing parents and nannies begin to line up for story time outside some branches an hour before doors open. To prevent overcrowding, tickets are given out at the New Amsterdam and Webster branches, both in Manhattan, the Parkchester branch in the Bronx, and a half-dozen branches in Brooklyn, including in Park Slope, Kensington and Bay Ridge.

        The 67th Street branch keeps adding story times — there are now six a week — and holds sessions outdoors in the summer, when crowds can swell to 200 people.

        In Queens, 41 library branches are scheduled to add weekend hours this month, and many will undoubtedly include weekend story times. As Joanne King, a spokeswoman for the library explained, parents have been begging for them and “every story time is full, every time we have one.”

        Long a library staple, story time has typically been an informal reading to a small group of boys and girls sitting in a circle. Today’s story times involve carefully planned lessons by specially trained librarians that emphasize education as much as entertainment, and often include suggestions for parents and caregivers about how to reinforce what children have learned, library officials said.

        Libraries around the country have expanded story time and other children’s programs in recent years, attracting a new generation of patrons in an age when online offerings sometimes make trips to the book stacks unnecessary. Sari Feldman, president of the American Library Association, said such early-literacy efforts are part of a larger transformation libraries are undergoing to become active learning centers for their communities by offering services like classes in English as a second language, computer skills and career counseling.

        Ms. Feldman said the increased demand for story time was a product, in part, of more than a decade of work by the library association and others to encourage libraries to play a larger role in preparing young children for school. In 2004, as part of that effort, the association developed a curriculum, “Every Child Ready to Read,” that she said is now used by thousands of libraries.

        The New York Public Library is adding 45 children’s librarians to support story time and other programs, some of which are run in partnership with the city government. It has also designated 20 of its 88 neighborhood branches, including the Fort Washington Library, as “enhanced literary sites.” As such, they will double their story time sessions, to an average of four a week, and distribute 15,000 “family literacy kits” that include a book and a schedule of story times.

        “It is clear that reading and being exposed to books early in life are critical factors in student success,” Anthony W. Marx, president of the New York Public Library, said. “The library is playing an increasingly important role in strengthening early literacy in this city, expanding efforts to bring reading to children and their families through quality, free story times, curated literacy programs, after-school programs and more.”

        For its part, the Queens Library plans to expand a “Kick Off to Kindergarten” program that attracted more than 180 families for a series of workshops last year. Library officials said that more than three-quarters of the children who enrolled, many of whom spoke a language other than English at home, developed measurable classroom skills.

    From: www.nytimes.com/2015/11/02

    According to the text, not only parents but also nannies start lining up for the reading of stories
    Escolha uma alternativa para a questão 0d6adf8b-91
  • Ciências da Natureza

    Química

    O ácido pentanoico (conhecido como ácido valérico) é um líquido oleoso, com cheiro de queijo velho, tem aplicações como sedativo e hipnótico. Se aplicado diretamente na pele, tem uma efetiva ação sobre a acne.
    Imagem da questão de Química, UECE 2015, 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.
    De acordo com sua fórmula estrutural, seu isômero correto é o
    Escolha uma alternativa para a questão 3f420d89-91
  • Ciências da Natureza

    Química

    O cloro ficou muito conhecido devido a sua utilização em uma substância indispensável a nossa sobrevivência: a água potável. A água encontrada em rios não é recomendável para o consumo, sem antes passar por um tratamento prévio. Graças à adição de cloro, é possível eliminar todos os microrganismos patogênicos e tornar a água potável, ou seja, própria para o consumo. Em um laboratório de química, nas condições adequadas, fez-se a adição do gás cloro em um determinado hidrocarboneto, que produziu o 2,3-diclorobutano. Assinale a opção que corresponde à fórmula estrutural desse hidrocarboneto.
    Escolha uma alternativa para a questão 3f3962db-91
  • Ciências da Natureza

    Química

    O ácido fosfórico usado em refrigerante tipo “coca-cola” e possível causador da osteoporose, pode ser formado a partir de uma reação cuja equação química não balanceada é:
     Ca3(PO4)2 + H2SO4 → H3PO4 + CaSO4.
    Para obter-se 980g de ácido fosfórico, a massa total dos reagentes (massa do H2SO4 + massa do Ca3(PO4)2), em gramas, que devem ser usados é 
    Escolha uma alternativa para a questão 3f26bbb8-91
  • Ciências da Natureza

    Química

    São conhecidos alguns milhares de hidrocarbonetos. As diferentes características físicas são uma consequência das diferentes composições moleculares. São de grande importância econômica, porque constituem a maioria dos combustíveis minerais e biocombustíveis. A análise de uma amostra cuidadosamente purificada de determinado hidrocarboneto mostra que ele contém 88,9% em peso de carbono e 11,1% em peso de hidrogênio. Sua fórmula mínima é
    Escolha uma alternativa para a questão 3f1ba6d3-91
  • Ciências da Natureza

    Química

    Segundo Chang e Goldsby, no livro Química, 11ª edição, nitrato de amônio é o fertilizante mais importante do mundo. Além de fertilizante, é um poderoso explosivo que foi responsável pela destruição de um navio no Texas em 1947, por um atentado no WTC em Nova York em 1993 e pela destruição do Edifício Alfred P. Murrah em Oklahoma City em 1995. A uma temperatura de 300 oC, o nitrato de amônio se decompõe em gás nitrogênio, água no estado gasoso e oxigênio, liberando calor. A massa de nitrogênio produzida nestas condições a partir de 48 kg de nitrato de amônio será
    Escolha uma alternativa para a questão 3f149412-91
  • Ciências da Natureza

    Química

    Uma amostra de gás causador de chuva ácida, com massa de 4,80 g, ocupa um volume de 1 litro quando submetido a uma pressão de 1,5 atm e a uma temperatura de 27 oC. Esse gás é o 
    Escolha uma alternativa para a questão 3f0fddf2-91
  • Ciências da Natureza

    Química

    Durante a Segunda Guerra Mundial, o monóxido de carbono foi usado como combustível alternativo nos veículos para suprir a falta de gasolina. O monóxido de carbono era obtido em equipamentos conhecidos como gasogênios, pela combustão parcial da madeira. Nos motores dos automóveis, o monóxido de carbono era convertido em gás carbônico ao reagir com o oxigênio, e liberava 57,0 kcal/mol. Sabendo-se que a entalpia do produto dióxido de carbono é – 94,0 kcal, podese afirmar corretamente que a entalpia de formação do monóxido de carbono é
    Escolha uma alternativa para a questão 3f0c7532-91
  • Ciências da Natureza

    Química

    A glicose que ingerimos no cotidiano sofre uma degradação para fornecer energia ao nosso organismo, reagindo com oxigênio e produzindo água e dióxido de carbono. De acordo com a American Heart Association (AHA), a quantidade máxima de açúcar adicionado que um homem pode comer por dia é 37,5 g (9 colheres de chá) que correspondem a 150 calorias. A massa de gás carbônico produzida dentro desse limite será
    Escolha uma alternativa para a questão 3f08b344-91
  • Ciências da Natureza

    Química

    O magnésio subministrado na forma de cloreto de magnésio tem papel importante para o fortalecimento dos músculos e nervos, função imunológica, reforça a estrutura óssea, regula os níveis de pressão arterial e o açúcar do sangue, etc. A título experimental, um estudante de bioquímica preparou uma solução de cloreto de magnésio utilizando 200 g de água e 20 g de cloreto de magnésio que passou a ter densidade de 1,10 g/mL. Para essa solução, a concentração em quantidade de matéria é, aproximadamente,
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  • Ciências da Natureza

    Química

    Em 2010, a NASA anunciou a descoberta de uma nova espécie de bactéria que no seu DNA apresenta ligações de arsênio ao invés de fósforo. O arsênio é um elemento químico fundamental para a vida, mesmo sendo extremamente venenoso. Apresenta três estados alotrópicos, é bom condutor de calor e péssimo condutor de eletricidade, reage com o cloro, com o enxofre, com o oxigênio, é altamente tóxico, volátil e insolúvel na água. Sobre o arsênio e o DNA, assinale a afirmação verdadeira.
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  • Ciências da Natureza

    Física

    A potência elétrica dissipada em um resistor ôhmico pode ser dada pelo produto da tensão aplicada pela corrente percorrida no elemento resistivo. Em termos de unidades fundamentais do SI, a potência é dada em unidades de
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  • Ciências da Natureza

    Física

    De um modo simplificado, pode-se descrever mecanicamente um amortecedor automotivo como uma haste cujo tamanho varia mediante a aplicação de uma força de tração ou compressão na direção de seu comprimento. Essa haste oferece uma força de resistência oposta à força aplicada. Diferentemente de uma mola helicoidal, cuja força é proporcional ao deslocamento, no amortecedor a força é proporcional à velocidade de compressão ou de distensão. Nesse amortecedor ideal, sendo aplicada uma tração que faça seu comprimento L variar como L = 2t, onde t é o tempo, a força de resistência é 
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  • Ciências da Natureza

    Física

    Considerando a distância que estamos do Sol, podemos tratá-lo como uma fonte de luz puntiforme que emite frentes de ondas eletromagnéticas esféricas. As frentes de onda luminosas que chegam à Terra podem ser tratadas como planas, porque têm
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  • Ciências da Natureza

    Física

    Em uma projeção de cinema, de modo simplificado, uma película semitransparente contendo a imagem é iluminada e a luz transmitida passa por uma lente que projeta uma imagem ampliada. Com base nessas informações, pode-se afirmar corretamente que essa lente é
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  • Ciências da Natureza

    Física

    Considere uma lâmpada emitindo luz monocromática sobre a superfície de um tanque com água. A luz que incide sobre a água se propaga até a superfície na forma de um cone com eixo perpendicular à água. Sendo o índice de refração da água superior ao do ar, pode-se afirmar corretamente que o cone de luz dentro da água
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