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.
Alguns dos efeitos fisiológicos da testosterona podem ser aumentados pelo uso de alguns de seus derivados sintéticos: os anabolizantes. Estas substâncias provocam aumento da massa muscular e diminuição da gordura. Seu uso indiscriminado, porém, pode provocar efeitos colaterais sérios, como hipertensão, edemas, distúrbios do sono e acne. Seu uso prolongado leva a danos irreversíveis ao fígado e à diminuição na produção do esperma. Analise as estruturas abaixo.
A opção que indica as funções comuns nos três
compostos é:
O sulfeto de níquel (II), NiS, ocorre na natureza como um mineral relativamente raro, a millerita. Uma de suas ocorrências é em meteoritos. Para se determinar a quantia de NiS em uma amostra do mineral, ela é tratada com ácido nítrico para liberar o níquel.
NiS(s) + 4HNO3(aq) → Ni(NO3)2(aq) + S(s) + 2NO2(g) + 2H2O(l)
A solução aquosa de Ni(NO3)2 é então tratada com o composto orgânico dimetilglioxima (C4H8N2O2 – DMG) para formar o sólido vermelho Ni(C4 H7N2O2 )2(s) de acordo com a reação:
Ni(NO3 )2(aq) + 2 C4 H8 N2 O2(aq) → Ni(C4 H7 N2 O2 ) 2(s) + 2 HNO3(aq
Se uma amostra de 0.468 g contendo millerita
produz 0.206 g do sólido vermelho Ni(C4
H7
N2
O2
)2(s) , a
porcentagem de NiS na amostra é:
O Halotano, C2HBrClF3 , é um gás não inflamável, não explosivo, e não irritante que é geralmente usado como anestésico, por inalação. Suponha que se faça a mistura de 15.0 g de vapor de Halotano com 23.5 g do gás oxigênio sendo que a pressão total da mistura seja igual a 855 mmHg.
Nas condições apresentadas as pressões parciais do halotano e do oxigênio na mistura serão, respectivamente:
Read the text below and answer the questions which follow it.
TechTank
Political polarization on Facebook
Darrell M. West and Joshua Bleiberg.
Wednesday, May 13, 2015
Social scientists have built a large body of evidence that people tend to befriend others with similar political beliefs. The research demonstrates that the polarization phenomenon also applies to social networks, like Facebook. The study finds that a Facebook user has approximately five friends with similar political views and only one friend on the other side of the spectrum. In a democracy, to encounter a variety of political opinions is generally seen as a positive value for citizens.
Facebook is not just a social network. It’s the platform that millions of people use to learn about current events. Taking small steps to help combat political polarization in the long run will add to the trust that users have in Facebook.
Adapted from:<https://www.brookings.edu/blog/techtank/2015/05/13/political-polarization-on-facebook/>.
Read the text below and answer the questions which follow it.
TechTank
Political polarization on Facebook
Darrell M. West and Joshua Bleiberg.
Wednesday, May 13, 2015
Social scientists have built a large body of evidence that people tend to befriend others with similar political beliefs. The research demonstrates that the polarization phenomenon also applies to social networks, like Facebook. The study finds that a Facebook user has approximately five friends with similar political views and only one friend on the other side of the spectrum. In a democracy, to encounter a variety of political opinions is generally seen as a positive value for citizens.
Facebook is not just a social network. It’s the platform that millions of people use to learn about current events. Taking small steps to help combat political polarization in the long run will add to the trust that users have in Facebook.
Adapted from:<https://www.brookings.edu/blog/techtank/2015/05/13/political-polarization-on-facebook/>.
Read the text below and answer the questions which follow it.
TechTank
Political polarization on Facebook
Darrell M. West and Joshua Bleiberg.
Wednesday, May 13, 2015
Social scientists have built a large body of evidence that people tend to befriend others with similar political beliefs. The research demonstrates that the polarization phenomenon also applies to social networks, like Facebook. The study finds that a Facebook user has approximately five friends with similar political views and only one friend on the other side of the spectrum. In a democracy, to encounter a variety of political opinions is generally seen as a positive value for citizens.
Facebook is not just a social network. It’s the platform that millions of people use to learn about current events. Taking small steps to help combat political polarization in the long run will add to the trust that users have in Facebook.
Adapted from:<https://www.brookings.edu/blog/techtank/2015/05/13/political-polarization-on-facebook/>.
Read the text below and answer the questions which follow it.
TechTank
Political polarization on Facebook
Darrell M. West and Joshua Bleiberg.
Wednesday, May 13, 2015
Social scientists have built a large body of evidence that people tend to befriend others with similar political beliefs. The research demonstrates that the polarization phenomenon also applies to social networks, like Facebook. The study finds that a Facebook user has approximately five friends with similar political views and only one friend on the other side of the spectrum. In a democracy, to encounter a variety of political opinions is generally seen as a positive value for citizens.
Facebook is not just a social network. It’s the platform that millions of people use to learn about current events. Taking small steps to help combat political polarization in the long run will add to the trust that users have in Facebook.
Adapted from:<https://www.brookings.edu/blog/techtank/2015/05/13/political-polarization-on-facebook/>.
