Questões de Vestibular

The passages “Developing countries, and the youth strike protesters who have taken to the streets around the world, point out” (lines 34-37) and “These new findings reinforce our 2019 analysis which showed that today’s children will need to emit eight times less CO₂ over the course of their lifetime than their grandparents” (lines 62-67) contain relative clauses that are respectively

The sentence “The analysis found that only those aged under 40 years today will live to see the consequences of the choices made on emissions cuts.” (lines 111-114) contains a/an 

The passage “we can take much of the climate burden from our children’s shoulders if we limit warming to 1.5C by phasing out fossil fuel use” (lines 56-59) contains a 

“‘This highlights a disproportionate climate change burden for young generations in the global south,’ the researchers said.” (lines 97-100) is an example of

“Our results highlight a severe threat to the safety of young generations” (lines 40-42) is a 

To save younger generations and to safeguard their future, there must be a/an

One of the sad findings about the climate crisis we live in is that

Dohyeon Kim, the South Korean activist, emphasized that

The fact that thousands of children in sub-Saharan Africa face higher extreme events highlights that 

According to Leo Hickman, the new findings point to the fact that today's children will

A member of the study team, Dr Katja Frieler, said the good news is that there is a way to

As to the climate summit that will take place in Glasgow, a relevant task is to 

A recent study on the climate crisis, among other things, shows that it 

TEXT 3

A pandemic of change?

Many researchers and wildlife organizations are urging scientists to use this unprecedented time for a close examination of the impact of human activity on the natural world. They argue that the information that researchers gather during this time could help improve conservation and biodiversity efforts.

It may also improve their ability to predict global environmental changes and potential cases of zoonoses, the transmission of disease from animals to humans. This could save millions of human lives, and economic losses, going forward.

Realistically, it will take years to assess exactly how the COVID-19 pandemic has affected wildlife, the environment, and the climate. Moreover, the impact of the pandemic on the natural world is unlikely to be linear. Research suggests that a reduction in some pollutants, including nitrogen oxides, may result in the rise of others, such as ozone.

Understanding how this pandemic has changed humans’ relationship with nature may be just as complex. But for now, these positive changes may be enough to give some people, and Mother Nature, the hope of a better future.

Avaiable from: <https://www.medicalnewstoday.com/articles/how-covid-19-has-changed-the-face-of-the-natural-world#A-pandemic-of-change?> Access: 10 Oct. 2021. Adapted.

According to the article, up to the moment, the consequences of COVID-19 on the environment:

TEXT 2

Available from: www.nature.com/naturemedicine. Access: 10 Oct. 2021. Adapted.

The linking word “although” (underlined in two sentences of the text) establishes a contrast between ideas, and it may be replaced by “but”. The alternative which correctly expresses the ideas which are contrasted in the two sentences is: 

TEXT 1

Avaiable from:<https://twitter.com/dalupton/status/1291675856926998530>   Access: 10 Oct. 2021.

In the comic strip, all the characters are answering a question. It may be inferred, from their answers, that this question is:

Sobre o composto orgânico de fórmula estrutural

H₂C = C(C₃H₇)CH(CH₃)CH(CH₃)CH₂CH₃

fazem-se as seguintes afirmações:

I É um alceno.

II Possui três ramificações diferentes entre si, ligadas à cadeia principal.

III Apesar de ter fórmula molecular C₁₁H₂₂, não é um hidrocarboneto.

IV Possui no total quatro carbonos terciários.

A opção que contém as afirmações corretas é:

Na titulação de 50.00 mL de HAc 0.10 M (Ka = 1.8 x 10^-5 ) com padrão de NaOH 0.10 M, após a adição dos seguintes volumes do titulante: 49.95 mL e 75.00 mL, os valores do pH, serão, aproximadamente:

Considere a seguinte reação:

A + B → butanoato de etila + H₂O

Nessas condições, A e B são, respectivamente: 

Uma amostra de uma rocha de massa 0.250 g, com baixo teor de Cr, foi submetida à fusão com Na₂O₂ transformando o cromo em cromato (CrO₄ ⁼ ). A amostra foi dissolvida em água em ebulição, acidificada e o CrO₄ ⁼ foi convertido a dicromato (Cr₂O₇ ⁼ ). Na sequência, a amostra foi titulada com 27 mL de solução de Fe²⁺. Os produtos desta reação foram Fe³⁺ e Cr³⁺. Numa padronização paralela, 47 mL de Fe²⁺ foram usados na redução de 0.1172 g de K₂Cr₂O₇. A reação decorrente foi:

Cr₂O₇ ⁼ + 6Fe²⁺ + 14H⁺ → 2Cr³⁺ + 6Fe³⁺ + 7H₂O.

A massa percentual de Cr na amostra é: