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O etanol, utilizado como combustível em carros flex, é produzido pelo processo de fermentação, do caldo de cana, “garapa”, onde leveduras transformam a sacarose em álcool, segundo a reação simplificada:
C12H22O11 + H2O → 2C6H12O6
C6H12O6 → CH3CH2OH + 2CO2 ∆H = -23,5kcal
A fermentação da sacarose trata-se de um processo:
Algumas bactérias do solo, como as nitrobactérias, catalisam a oxidação do nitrogênio contido em sais de amônio (fertilizante químico) formando nitrato, o qual pode ser assimilado pelos vegetais.
2O2 + NH4+ → NO3- + 2H+ + H2O
É correto afirmar que o nitrogênio presente no
ânion nitrato apresenta um número de oxidação
(Nox) de:
Em regiões industrializadas ou em grandes cidades, que possuem tráfego intenso, ocorre o fenômeno conhecido como smog fotoquímico. É como se uma forte neblina envolvesse a cidade durante o horário de maior insolação ocasionando desconforto visual.
O smog fotoquímico é resultado das reações de NO, radiação solar e NO2 com Compostos Orgânicos Voláteis, resultando na formação de aldeídos, nitrocompostos, aerossóis e oxidantes totais.
Figura 1 Variação da composição de gases atmosféricos relacionados com o smog fotoquímico ao longo do dia. (Fonte: Introdução à química ambiental. ROCHA, Julio Cesar; COSTA, André H.,CARDOSO; Arnaldo A. 2. ed. Porto Alegre: Bookman, 2009. p. 111).
Com relação à formação do smog fotoquímico,
é incorreto afirmar.
Analise as assertivas abaixo.
I. A explosão ocorreu em uma mina de carvão localizada na província de Henan, próxima à cidade de Xinhua.
II. A palavra pit (ℓ. 8) refere-se à mina que explodiu.
III. Du Bo é um deputado chinês empenhado na operação para salvar os mineiros.
IV. A palavra workers (ℓ. 3 e 14) refere-se aos mineiros.
V. É a segunda vez que ocorrem acidentes com explosão na mesma mina e com vítimas fatais.
Assinale a alternativa correta.
Texto 2
LIVING TOGETHER
TAKING THE NEXT STEP
Couples who move in together may be rejecting, at least temporarily. Old-fashioned notions of marriage. But when it comes to deciding whether to wed, they fall into the same gender roles as staunch traditionalists.
In other words, the guy still calls the shots. This according to a survey that looked at nearly 400 cohabiting couples and what happens when only one partner thinks the twosome will eventually marry.
If the man is the one hearing wedding bells, it seems, a couple is nearly as likely to marry as when both partners plan to say “I do”. But if it's the woman who hopes to wed, the couple is only half as likely to wind up at the altar.
All of which surpised Bowling Green State University's Wendy Manning, Ph.D. “This is a group that subscribes to less traditional gender roles. So we just assumed they would behave in a less traditional manner.” -Alyssa Rarraport
Psychology Today – March/April 1996_
Fonte: GAMA, Angela N. M. In Introdução à leitura em inglês. RJ:
Gama Filho, 2001, p.76.
Texto 2
LIVING TOGETHER
TAKING THE NEXT STEP
Couples who move in together may be rejecting, at least temporarily. Old-fashioned notions of marriage. But when it comes to deciding whether to wed, they fall into the same gender roles as staunch traditionalists.
In other words, the guy still calls the shots. This according to a survey that looked at nearly 400 cohabiting couples and what happens when only one partner thinks the twosome will eventually marry.
If the man is the one hearing wedding bells, it seems, a couple is nearly as likely to marry as when both partners plan to say “I do”. But if it's the woman who hopes to wed, the couple is only half as likely to wind up at the altar.
All of which surpised Bowling Green State University's Wendy Manning, Ph.D. “This is a group that subscribes to less traditional gender roles. So we just assumed they would behave in a less traditional manner.” -Alyssa Rarraport
Psychology Today – March/April 1996_
Fonte: GAMA, Angela N. M. In Introdução à leitura em inglês. RJ:
Gama Filho, 2001, p.76.
Texto 2
LIVING TOGETHER
TAKING THE NEXT STEP
Couples who move in together may be rejecting, at least temporarily. Old-fashioned notions of marriage. But when it comes to deciding whether to wed, they fall into the same gender roles as staunch traditionalists.
In other words, the guy still calls the shots. This according to a survey that looked at nearly 400 cohabiting couples and what happens when only one partner thinks the twosome will eventually marry.
If the man is the one hearing wedding bells, it seems, a couple is nearly as likely to marry as when both partners plan to say “I do”. But if it's the woman who hopes to wed, the couple is only half as likely to wind up at the altar.
All of which surpised Bowling Green State University's Wendy Manning, Ph.D. “This is a group that subscribes to less traditional gender roles. So we just assumed they would behave in a less traditional manner.” -Alyssa Rarraport
Psychology Today – March/April 1996_
Fonte: GAMA, Angela N. M. In Introdução à leitura em inglês. RJ:
Gama Filho, 2001, p.76.
Texto 1
CAN A VIRUS MAKE YOU FAT?
Although the idea sounds more like the premise of a B movie than scientific theory two scientists at the University of Wisconsin in Madison believe they've found a virus that causes some people to get fat. Nikhil Dhurandhar and Richard Atkinson reported recently that when they injected a virus known as AD36 into mice and chickens, the animals' body fat increased. Because humans were unlikely to volinteer for such exiperimentation, the scientists decided to test for the presence of antibodies to the virus. Of 154
people tested, about 15 percent of those who were obese had the antibodies. None of the lean people did.
However, the findings don't necessarily prove that
the virus caused obesity in the test group. As
several virologists have pointed out, obese people
may simply be more susceptible to such a virus.
Texto 1
CAN A VIRUS MAKE YOU FAT?
Although the idea sounds more like the premise of a B movie than scientific theory two scientists at the University of Wisconsin in Madison believe they've found a virus that causes some people to get fat. Nikhil Dhurandhar and Richard Atkinson reported recently that when they injected a virus known as AD36 into mice and chickens, the animals' body fat increased. Because humans were unlikely to volinteer for such exiperimentation, the scientists decided to test for the presence of antibodies to the virus. Of 154
people tested, about 15 percent of those who were obese had the antibodies. None of the lean people did.
However, the findings don't necessarily prove that
the virus caused obesity in the test group. As
several virologists have pointed out, obese people
may simply be more susceptible to such a virus.
Texto 1
CAN A VIRUS MAKE YOU FAT?
Although the idea sounds more like the premise of a B movie than scientific theory two scientists at the University of Wisconsin in Madison believe they've found a virus that causes some people to get fat. Nikhil Dhurandhar and Richard Atkinson reported recently that when they injected a virus known as AD36 into mice and chickens, the animals' body fat increased. Because humans were unlikely to volinteer for such exiperimentation, the scientists decided to test for the presence of antibodies to the virus. Of 154
people tested, about 15 percent of those who were obese had the antibodies. None of the lean people did.
However, the findings don't necessarily prove that
the virus caused obesity in the test group. As
several virologists have pointed out, obese people
may simply be more susceptible to such a virus.
A figura abaixo que mostra o mapa mais antigo que se tem notícia é, provavelmente, de origem oriental. Trata-se de um tablete de argila cozido e que contém cadeias de montanhas e, no centro delas, um rio, provavelmente, o Eufrates (SILVA, 1999, p. 81). Não se sabe, ao certo, a sua idade, calcula-se entre 2.400 e 2.200 anos antes da era cristã, havendo quem assegure que possua mais de 3.800 anos.
É correto afirmar que a origem desse mapa é
da:
“Empresa que controla outras empresas pela posse da maior parte de suas ações e que se dedica exclusivamente a esse controle”. (BOLIGIAN e ALVES, 2004).
O texto acima refere-se:
Compreende um conjunto de serras de cristas paralelas, com topos arrasados e depressões interplanálticas e intermontanas, localizadas na porção centro-sul de Mato Grosso. Na perspectiva geomorfológica estão situadas entre a Depressão Cuiabana, a Depressão do Alto Paraguai e os Planaltos dos Guimarães e dos Parecis. Essas serras atuam como divisor de águas das bacias Amazônica e do Paraná.
O enunciado refere-se:
As águas subterrâneas são as águas que se infiltram no solo após as precipitações. São de grande importância por representarem a maior parte da água doce aproveitada no consumo e nas atividades antrópicas.
Sobre o assunto, assinale a alternativa correta.
É um clima controlado por massas de ar equatoriais e tropicais, é muito quente, com pequenas amplitudes térmicas e chuvas abundantes na maior parte do ano.
Assinale a alternativa que identifica o clima e o local de ocorrência.
Conheça nossos planos