Instituição
1.157 questões de Centro de Educação Superior a Distância do Estado do Rio de Janeiro (CEDERJ), de 2006 a 2025. Cada uma tem página própria, com enunciado completo, alternativas e gabarito — e dá para responder na própria página.
Cinquenta modelos de uma agência foram identificadas de acordo com a cor dos cabelos e dos olhos, conforme tabela a seguir:
Para fazer a propaganda de certo produto, será sorteada,
ao acaso, uma das 50 modelos. A probabilidade
de a modelo sorteada ter cabelos negros ou olhos
verdes é de
Amplamente comercializado, em todo o Brasil, sobretudo por seu valor energético, o açaí contém antocianinas, substâncias responsáveis pelas colorações nos tons de azul, vermelho e arroxeado em diversos tecidos vegetais, especialmente em flores e frutos. As antocianinas mudam sua coloração conforme a acidez ou basicidade do meio em que se encontram. Isso faz com que o extrato de açaí possa atuar como um indicador ácido-base. O extrato de açaí, por exemplo, torna-se avermelhado em soluções ácidas (pH<7), esverdeado em soluções básicas (pH>7) e roxo claro em soluções neutras (pH=7).
Observando a figura abaixo, as substâncias que, em presença de extrato de açaí, apresentariam, respectivamente, colorações avermelhadas, esverdeadas e arroxeadas são:
A partir da reação abaixo o volume aproximado, em metros cúbicos de etileno (d=1.18 kg/m3 ), necessário para preparar 2.0 toneladas de gás mostarda é:
Com base nas informações sobre os valores de potenciais de redução, a 25º C:
Mg+2(aq) + 2 e- ⇄ Mg (s) E° = - 2.4 V
Cu+2(aq) + 2 e- ⇄ Cu (s) E° = + 0.34 V
É correto afirmar que:
Em um acidente no laboratório, um frasco contendo 2.0 kg de NaOH foi quebrado e, para neutralizar essa soda foi proposta a reação
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l),
que liberou 660 Kcal. Se 1 cal = 4.18 J, a variação da
entalpia de neutralização, em kJ mol-1, é igual a:
Text 1
The global warming controversy
The global warming controversy is an ongoing dispute about the effects of humans on global climate and about what policies should be implemented to avoid possible undesirable effects of climate change.
The current scientific consensus on climate change is that recent warming indicates a fairly stable long-term trend, that the trend is largely human-caused, and that serious damage may result at some future date if steps are not taken to halt the trend.
Mainstream scientific organizations worldwide (Royal Society, American Geophysical Union, Joint Science Academies, Intergovernmental Panel on Climate Change, American Meteorological Society, and American Association for the Advancement of Science) concur with the assessment that most of the observed warming over the last 50 years is likely to have been due to the human-caused increase in greenhouse gas concentrations.
However, there is also a small but vocal number of scientists in climate and climate-related fields that disagree with the consensus view.
Adapted from:< https://www.sciencedaily.com/terms/global_warming_controversy.htm.> Access 30 Sept. 2017.
Text 2
Climate change label leads to climate science acceptance
On the heels of President Donald Trump's decision to pull the United States out of the Paris climate agreement, a new Cornell University study finds that labels matter when it comes to acceptance of climate science.
The U.S. public doubts the existence of "global warming" more than it doubts "climate change".
In a nationally representative survey, 74.4 percent of respondents said they believed that climate change is really happening. But only 65.5 percent said they believed in global warming.
Nonetheless, it's important to remember that 65 percent of respondents did indicate that global warming is occurring, said co-author Peter Enns, associate professor of government. "In other words, although the term matters -- climate change versus global warming -- an overwhelming majority of people still state that global warming is happening," he said.
Adapted from:<http://mediarelations.cornell.edu/2017/06/21/climate-change-label-leads-to-climate-science-acceptance/>. Access. 23 Sept. 2017.
Glossário
Text 1
The global warming controversy
The global warming controversy is an ongoing dispute about the effects of humans on global climate and about what policies should be implemented to avoid possible undesirable effects of climate change.
The current scientific consensus on climate change is that recent warming indicates a fairly stable long-term trend, that the trend is largely human-caused, and that serious damage may result at some future date if steps are not taken to halt the trend.
Mainstream scientific organizations worldwide (Royal Society, American Geophysical Union, Joint Science Academies, Intergovernmental Panel on Climate Change, American Meteorological Society, and American Association for the Advancement of Science) concur with the assessment that most of the observed warming over the last 50 years is likely to have been due to the human-caused increase in greenhouse gas concentrations.
However, there is also a small but vocal number of scientists in climate and climate-related fields that disagree with the consensus view.
Adapted from:< https://www.sciencedaily.com/terms/global_warming_controversy.htm.> Access 30 Sept. 2017.
Text 2
Climate change label leads to climate science acceptance
On the heels of President Donald Trump's decision to pull the United States out of the Paris climate agreement, a new Cornell University study finds that labels matter when it comes to acceptance of climate science.
The U.S. public doubts the existence of "global warming" more than it doubts "climate change".
In a nationally representative survey, 74.4 percent of respondents said they believed that climate change is really happening. But only 65.5 percent said they believed in global warming.
Nonetheless, it's important to remember that 65 percent of respondents did indicate that global warming is occurring, said co-author Peter Enns, associate professor of government. "In other words, although the term matters -- climate change versus global warming -- an overwhelming majority of people still state that global warming is happening," he said.
Adapted from:<http://mediarelations.cornell.edu/2017/06/21/climate-change-label-leads-to-climate-science-acceptance/>. Access. 23 Sept. 2017.
Glossário
Text 1
The global warming controversy
The global warming controversy is an ongoing dispute about the effects of humans on global climate and about what policies should be implemented to avoid possible undesirable effects of climate change.
The current scientific consensus on climate change is that recent warming indicates a fairly stable long-term trend, that the trend is largely human-caused, and that serious damage may result at some future date if steps are not taken to halt the trend.
Mainstream scientific organizations worldwide (Royal Society, American Geophysical Union, Joint Science Academies, Intergovernmental Panel on Climate Change, American Meteorological Society, and American Association for the Advancement of Science) concur with the assessment that most of the observed warming over the last 50 years is likely to have been due to the human-caused increase in greenhouse gas concentrations.
However, there is also a small but vocal number of scientists in climate and climate-related fields that disagree with the consensus view.
Adapted from:< https://www.sciencedaily.com/terms/global_warming_controversy.htm.> Access 30 Sept. 2017.
Text 2
Climate change label leads to climate science acceptance
On the heels of President Donald Trump's decision to pull the United States out of the Paris climate agreement, a new Cornell University study finds that labels matter when it comes to acceptance of climate science.
The U.S. public doubts the existence of "global warming" more than it doubts "climate change".
In a nationally representative survey, 74.4 percent of respondents said they believed that climate change is really happening. But only 65.5 percent said they believed in global warming.
Nonetheless, it's important to remember that 65 percent of respondents did indicate that global warming is occurring, said co-author Peter Enns, associate professor of government. "In other words, although the term matters -- climate change versus global warming -- an overwhelming majority of people still state that global warming is happening," he said.
Adapted from:<http://mediarelations.cornell.edu/2017/06/21/climate-change-label-leads-to-climate-science-acceptance/>. Access. 23 Sept. 2017.
Glossário
Text 1
The global warming controversy
The global warming controversy is an ongoing dispute about the effects of humans on global climate and about what policies should be implemented to avoid possible undesirable effects of climate change.
The current scientific consensus on climate change is that recent warming indicates a fairly stable long-term trend, that the trend is largely human-caused, and that serious damage may result at some future date if steps are not taken to halt the trend.
Mainstream scientific organizations worldwide (Royal Society, American Geophysical Union, Joint Science Academies, Intergovernmental Panel on Climate Change, American Meteorological Society, and American Association for the Advancement of Science) concur with the assessment that most of the observed warming over the last 50 years is likely to have been due to the human-caused increase in greenhouse gas concentrations.
However, there is also a small but vocal number of scientists in climate and climate-related fields that disagree with the consensus view.
Adapted from:< https://www.sciencedaily.com/terms/global_warming_controversy.htm.> Access 30 Sept. 2017.
Text 2
Climate change label leads to climate science acceptance
On the heels of President Donald Trump's decision to pull the United States out of the Paris climate agreement, a new Cornell University study finds that labels matter when it comes to acceptance of climate science.
The U.S. public doubts the existence of "global warming" more than it doubts "climate change".
In a nationally representative survey, 74.4 percent of respondents said they believed that climate change is really happening. But only 65.5 percent said they believed in global warming.
Nonetheless, it's important to remember that 65 percent of respondents did indicate that global warming is occurring, said co-author Peter Enns, associate professor of government. "In other words, although the term matters -- climate change versus global warming -- an overwhelming majority of people still state that global warming is happening," he said.
Adapted from:<http://mediarelations.cornell.edu/2017/06/21/climate-change-label-leads-to-climate-science-acceptance/>. Access. 23 Sept. 2017.
Glossário
