Não é de hoje que os polímeros fazem parte de nossa vida; progressos obtidos pelos químicos permitiram avanços importantes em diversas áreas. Os avanços científicos e tecnológicos têm possibilitado a produção de novos materiais mais resistentes ao ataque químico e ao impacto. O Kevlar tem sido utilizado na produção industrial de coletes à prova de balas, além de apresentar característica de isolante térmico.
A obtenção desse polímero ocorre por meio da reação a seguir.
Fonte: PERUZZO, Francisco M.; CANTO, Eduardo L. Química na Abordagem do Cotidiano. Vol. 3. São Paulo: Moderna, 2009. p.374. (adaptado)
Com base nos dados, é correto afirmar que o polímero é obtido por uma reação de
Questões relacionadas
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Um maquinista de trem ganha R$ 100,00 por viagem e só pode viajar a cada 4 dias. Ele ganha somente se fizer a viagem e sabe que estará de férias de 1º a 10 de junho, quando não poderá viajar. Sua primeira viagem ocorreu no dia primeiro de janeiro.
Considere que o ano tem 365 dias. Se o maquinista quiser ganhar o máximo possível, quantas viagens precisará fazer?
- História | 6.15 Descolonização
(ACAFE) Durante o período da Guerra Fria as ideias do pan-africanismo e o pan-arabismo foram relevantes na afirmação de diversos movimentos de libertação e de independência na África e Oriente Médio.
Acerca desses movimentos e de suas proposições e correlações é correto afirmar, exceto:
- Língua Inglesa | 2.07 Conjunções
(AFA) TEXTO:THE RELATIONSHIP BETWEEN FRIENDS AND TYPES OF FRIENDSHIP
Everyone has at least one best friend, some maybe even more. There are also those people who are just friends and also arch-enemies. People may think that just because they are your friends it means that they are your best friend. The thing is, even though they are your friend, the relationship between a best friend and a friend is different. Either way regardless of archenemies, friends or best friends, there are not many ways to compare any of these different types of friends, but you can easily contrast them from one another.
Arch-enemies often know more about each other than two friends. In a comparison of personal relationships, 1friendship is considered to be closer than association, although a wide range of degrees of intimacy exists in friendships, arch-enemies, and associations. Friendship and association can be thought of as spanning across the same continuum. 2The study of friendship is included in the fields of sociology, social psychology, anthropology, philosophy, and zoology. Even animals have familiars! Various academic theories of friendship have been proposed, among which are social exchange theory, equity theory, relational dialectics, and attachment styles. 3In Russia, one typically bestows very few people the status of “friend”.
These friendships, however, make up in intensity what they lack in number. Friends are entitled to call each other by their first names alone, and to use diminutives. A customary example of polite behavior is addressing "acquaintances" by full first name plus their patronymic. These could include relationships which elsewhere would be qualified as real friendships, such as workplace relationships of long standing, or neighbors with whom one shares an occasional meal or a social drink with.
Also in the Middle East and Central Asia, male friendships, while less restricted than in Russia, tend to be reserved and respectable in nature. They may use nicknames and diminutive forms of their first names. In countries like India, it is believed in some parts that friendship is a form of respect, not born out of fear or superiority. Friends are people who are equal in most standards, but still respect each other regardless of their attributes or shortcomings. Most of the countries previously mentioned (Russia, Asia, and even the Middle East) and even our own nation are suffering a decline in genuine friendships.
According to a study documented in the June 2006 issue of the Journal American Sociological Review, Americans are thought to be suffering a loss in the quality and quantity of close friendships since at least 1985. The study’s results state that twenty-five percent of 4Americans have no close confidants, and the average total number of confidants per citizen has dropped from four to two. According to the study, 5Americans' dependence on family as a safety net went up from fifty-seven percent to eighty percent; Americans dependence on a partner or spouse went up from five percent to nine percent.
Recent studies have found a link between fewer friendships, especially in quality, and psychological and physiological regression. In the sequence of the emotional development of the individual, friendships come after parental bonding and before the pair bonding engaged in at the approach of maturity. In the intervening period between the end of early childhood and the onset of full adulthood, friendships are often the most important relationships in the emotional life of the adolescent, and are often more intense than relationships experienced later in life.
6Unfortunately, making friends seems to trouble many of people. Having no friends can be emotionally damaging for all ages, from young children to full grown adults. A study performed by researchers from Purdue University found that post-secondary-education friendships, college and university last longer than the friendships before it. Children with Asperger syndrome and autism usually have some difficulty forming friendships. 7Socially crippling conditions like these are just one way that the social world is so difficult to thrive in. 8This does not mean that they are not able to form friendships, however. With time, moderation and proper instruction, they are able to form friendships after realizing their own strengths and weaknesses.
9There is a number of theories that attempt to explain the link, including that; Good friends encourage their friends to lead more healthy lifestyles; 10Good friends encourage their friends to seek help and access services, when needed; 11Good friends enhance their friend’s 12coping skills in dealing with illness and other health problems; and/or Good friends actually affect physiological pathways that are protective of health. Regardless of what we think, we can clearly see that there are some ways that friends, best friends and archenemies are the same, but in the end they are clearly more different. 13Nonetheless we all have every single type in our lives.
(Adapted from: http://www.ukessays.com/essays/philosophy/therelationship- between-friends-and-types-of-friendship-philosophyessay. php)
“Nonetheless we all have every single type in our lives” (reference 13). The option that contains a synonym for the underlined expression is :
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Parangolés
Nildo da Mangueira com o Parangolé, 1964. Disponível em: <http://entrelinhablog.com.br/wp-content/uploads/2014/08/Nildo-da-Mangueira-com-o-Parangol%C3%A9-1964.jpg>.Acesso em: 23 mar.2015.
Em um desdobramento de suas experiências corporais, o trabalho de Hélio Oiticica culminou nos Parangolés (1964), em que o corpo incorpora a arte e a arte incorpora o corpo. Os Parangolés são capas de materiais diversos que, para acontecerem de fato como uma obra de arte, segundo Oiticica, devem ser vestidas e manipuladas, preferencialmente através da dança.
Materiais
- Plásticos coloridos diversos
- Papéis coloridos
- Fita crepe
- Tesoura
- Sistema de som
Procedimentos
1.º Apresentar os diversos Parangolés de Helio Oiticica através de imagens e informações textuais. Dsponível em: <http://www.digestivocultural.com/colunistas/coluna.asp?codigo=856&titulo=Parangole:_anti-obra_de_Helio_Oiticica>.Acesso em: 20 abr. 2015. e
<https://www.youtube.com/watch?v=yGYHJaGXHOU>. Acesso em: 20 abr. 2015.
2.º Após observarem as imagens e assistirem ao vídeo sobre a obra de Oiticica, em uma roda de conversa, discutir a parte conceitual do trabalho do artista. Perguntar aos alunos o que gostariam de representar com os Parangolés que vão construir na aula de Arte.
3.º Construir as capas com o material disponível. Auxilie os alunos no corte do material e nos adereços que colocarão nas vestimentas.
4.º Em grupos, eles deverão criar uma coreografia que mostre o que querem dizer com a encenação, ou um acompanhamento para a música escolhida.
5.º Propor que os alunos vistam as capas e, ao som originário dos Parangolés (sugestão), os sambas da Mangueira, os alunos se movimentem juntamente com o material construído.
- Geografia | 6.4 Transportes
(UFRGS) Considere as afirmações abaixo, sobre a mobilidade urbana no Brasil.
I. A mobilidade aumenta com a renda e varia em função das características econômicas e sociais das pessoas, além de vir acompanhada de diferenças no uso dos modos de transporte.
II. O modo “a pé” ainda representa parcela significativa dos deslocamentos urbanos no Brasil, apesar do aumento de uso do transporte individual (carro).
III. O investimento em trens, nas grandes metrópoles brasileiras, tem transformado essa modalidade na maior transportadora de passageiros.
Quais estão corretas?